2017 Meeting of the APS Division of Particles and Fields (DPF 2017)

Jul 31, 2017, 7:30 AM → Aug 4, 2017, 5:00 PM US/Central

Ramsey Auditorium (Fermi National Accelerator Laboratory)

Dmitri Denisov (Fermilab)

The conference will take place July 31 - August 4, 2017 in Batavia, IL, hosted by the Fermi National Accelerator Laboratory.

DPF Conference Homepage

PDF Final_Participants_List.pdf

Monday, July 31

7:30 AM → 8:25 AM Registration

Convener: Joy Pomillo (Fermilab)

8:25 AM → 10:15 AM Plenary: Monday morning

Convener: Dmitri Denisov (Fermilab)

slides dpf_proceedings_aug2017.pdf

8:30 AM Introduction

Speaker: Dmitri Denisov (Fermilab)

Slides DPF_Opening_Denisov_1.pdf

8:37 AM Welocme from DPF

Speaker: Dr Marcela Carena (Fermilab)

8:44 AM Welcome from Fermilab

Speaker: Nigel Lockyer (Fermilab)

8:51 AM Properties of the Higgs boson

Speaker: Prof. Giacinto Piacquadio (Stony Brook University)

Slides 31Jul_DPF_HiggsProperties.pdf

9:20 AM Searches for new physics at the energy frontier

Speaker: Dr Sadia Khalil (Kansas State)

Slides Sadia_BSM_DPF_2017.pdf

9:50 AM Physics at the future colliders

Speaker: Prof. Liantao Wang (University of Chicago)

10:15 AM → 10:45 AM Break

10:45 AM → 12:15 PM Beyond Standard Model: Monday morning

Convener: Prof. Christopher Hill (The Ohio State University)

10:45 AM Search for 3rd generation superpartners with the ATLAS experiment

Two of the most important parameters in supersymmetry are the masses of the stop and sbottom, the supersymmetric partners of the third generation quarks. A stop mass lighter than 1 TeV is favored in theory, however experimental evidence for a light stop has not been indicated from the various searches at the LHC so far. Therefore, it is very important to extend the searches to various pMSSM models with different mass splittings between the stop, neutralino(s), and chargino(s). Recent ATLAS results from searches for direct stop (sbottom) pair production are presented in final states with jets, missing transverse momentum, and leptons. The analyses are based on 36 fb$^{−1}$ of $\sqrt{s}=$13 TeV proton-proton collision data recorded with ATLAS detector at the LHC in 2015 and 2016.

Speaker: Dr Keisuke Yoshihara (University of Pennsylvania)

Slides keisuke_DPF2017_20170731.pdf

11:01 AM SUSY searches using top quark tagging at CMS

Results for searches for supersymmetry targeting top squarks and gluions will be presented in this talk. The analysis is optimized to specifically target top squark pair production and more generic supersymmetry signals with tops in the final state, including gluino pair production. These searches employ methods of tagging top quarks in the final state to reject standard model background in addition to traditional selection requirements such as missing transverse momentum. Due to the wide range of top quark transverse momentum and multiplicity produced in supersymmetric models, custom algorithms which combine traditional boosted top tagging techniques with algorithms designed to reconstruct tops combining individual reconstructed jets were developed. The results, using 35.9 ifb of data collected by the CMS experiment, are interpreted using simplified models of supersymmetry to place limits on top squark and gluino production.

Speaker: Nathaniel Pastika (Baylor University)

Slides DPF_2017.pdf

11:13 AM Search for supersymmetry in multijet events with missing transverse momentum in proton-proton collisions at 13 TeV

A search for supersymmetry is presented based on multijet events with large missing transverse momentum produced in proton-proton collisions at center-of-mass energy sqrt(s) = 13 TeV. The data, corresponding to an integrated luminosity of 35.9 fb-1, were collected with the CMS detector at the CERN LHC in 2016. The analysis utilizes four-dimensional exclusive search regions defined in terms of the number of jets, the number of tagged bottom quark jets, the scalar sum of jet transverse momenta, and the magnitude of the vector sum of jet transverse momenta. No evidence for a significant excess of events is observed relative to the expectation from the standard model. Limits on the pair production of gluinos and squarks are derived in the context of simplified models. Assuming the lightest supersymmetric particle to be a weakly interacting neutralino, 95% confidence level lower limits on the gluino mass as large as 1800 to 1960 GeV are derived, and on the squark mass as large as 960 to 1390 GeV, depending on the production and decay scenario.

Speaker: Kevin Pedro (Fermilab)

Slides RA2b_talk_DPF2017.pdf

11:29 AM Search for production of supersymmetric particles in final states with missing transverse momentum and multiple b-jets at s√=13~TeV proton-proton collisions with the ATLAS experiment

A search for supersymmetry involving the pair production of gluinos decaying via third-generation squarks to the lightest neutralino (χ̃ 10) is reported. It uses LHC proton-proton collision data at a center-of-mass energy s√=13 TeV, corresponding to an integrated luminosity of 36 ifb collected with the ATLAS detector in 2015 and 2016. The search is performed in events containing large missing transverse momentum and several energetic jets, at least three of which must be identified as originating from b-quarks, and are also used to form large-R jets using jet reclustering. To increase sensitivity, the sample is further divided depending on the presence or absence of electrons or muons. No excess is found above the predicted background. For χ̃10 masses below approximately 200 GeV, gluino masses of less than 2.0 (1.9) TeV are excluded at the 95% CL in simplified models of the pair-production of gluinos decaying via top (bottom) squarks. An interpretation of the limits in terms of the branching ratios of the gluinos in third generation squarks is also provided. These results significantly extend the exclusion limits obtained with the 3.2 fb−1 of data collected in 2015, with the exclusion limit on the gluino mass extended by up to 250 GeV for the case of massless neutralinos.

Speaker: Giordon Stark (University of Chicago)

Slides DPF2017_SUSYMBJ.pdf

11:41 AM Revisiting Dyons in Particle Physics

Revisiting Dyons in Particle Physics Schwinger’s dyon is a bound system of a magnetic monopole and an electric charge. Suppose a monopole (B=g/r2) is a distance zo above an electric charge (E= q/r2). Then (in gaussian units) this system stores an angular momentum about the z-axis of L = qg/8πc regardless of the magnitude of zo. Schwinger proposed that all hadronic matter is composed of dyons: the mesons are a dyon and an anti-dyon, the baryons are three dyons. Dyons can lead to all three of the familiar forces in the Standard Model (Science Magazine , 1969). As proposed by Schwinger, the dyon complemented quarks: the smallest charge |qo|=(1/3)e. The smallest magnetic charge go is the Dirac monopole go=(137/2)qo. Quantized magnetic charge g substitutes for the now usual color. All hadrons are colorless. In a subsequent publication, Schwinger explicitly excluded the integrally-charged Han-Nambu quarks and, rightfully, claimed credit for the prediction of the mass of the J/ψ (Science, 1975). Two Colorado professors, Kalyana Mahanthappa and Asim Barut were keen participants in the discussion of dyons. Barut believed that all hadronic matter is made of integrally charged dyons. Thus “dyonium”. Mahanthappa worried about the axis implicit in the dyon. This axis makes the topology of the dyon two-dimensional. He argued that at least one dyon must disobey the usual connection between spin and statistics. We believe that both may have been right. Han-Nambu quarks are not caught by the very sensitive oil-drop experiment of Perl, Lee, and Loomba (2004). The parity of the b-“quark” is still not determined except in the context of the Standard Model (PDG-2016). It may not be a pseudoscalar. Schwinger had a novel treatment of the Cabibbo angle and predicted the mass of the W to be 53 GeV in an era when the only leptons were the muon and the electron. Perl’s discovery of the third lepton, the tau, came too late for physicists to appreciate that 80 GeV is 3/2 of 53 GeV. Recent data from LHCb hints that, in distinction to the KL, the B decays to an electron and an anti electron more often than it decays to a muon and an antimuon. Lifetime vs Mass data from the summary tables of PDG-2016 suggest regularities which Schwinger anticipated long ago. It might be useful to review whether the dyon model can really be excluded

Speaker: Mr David Bartlett (University of Colorado at Boulder)

Slides FNAL_Bartlett2.pdf

11:53 AM Search for supersymmetry using boosted Higgs bosons and missing transverse momentum in proton-proton collisions at 13 TeV

CMS results at 8 and 13 TeV have placed bounds on gluino, squark, and electroweakino production in supersymmetric extensions to the Standard Model. The current sensitivity in some regions of phase space motivates more targeted searches. Depending on the mass spectra of the new particles, these models predict boosted objects, such as high pT vector bosons, in association with missing energy from sparticles escaping detection. A new analysis strategy using jet substructure techniques is applied in hopes of enhancing sensitivity to models where a boosted object can be contained in a single large jet. We will describe an analysis looking for evidence of supersymmetry in events with missing energy and boosted Higgs bosons (decaying to b-quarks) in the final state. We will compare our sensitivity to other analyses and describe the current limits on these production scenarios.

Speaker: Frank Jensen (University of Colorado)

Slides dpf2017_fojensen.pdf

10:45 AM → 12:15 PM Cosmology and Astrophysics: Monday morning

Convener: Dr James Annis (Fermilab)

10:45 AM TeV Particle Astrophysics with the High Altitude Water Cherenkov (HAWC) Detector

The High Altitude Water Cherenkov (HAWC) Gamma-ray Observatory was completed in March 2015 and is now giving us a new view of the sky. HAWC is a continuously operating, wide field-of-view observatory situated near Puebla, Mexico that observes 0.5–100 TeV gamma rays. It is 15 times more sensitive than previous generation Extensive Air Shower gamma-ray instruments and is able to detect the Crab nebula at >5σ a day. HAWC operates 24 hrs/day with >95% on-time and observes the entire overhead sky (~2 sr) serving as a TeV “finder” telescope for Imaging Atmospheric Cherenkov Telescopes (IACTs). It monitors the same sky as gamma-ray satellites (Fermi), gravity-wave (LIGO) detectors and neutrino observatories (IceCube) allowing for multi-wavelength and multi-messenger observations. I will present highlights from HAWC’s first year and half of operations.

Speaker: Kirsten Tollefson (Michigan State University)

Slides DPF2017_Highlights_final.pdf

11:05 AM Constraints on the astrophysical flux and the dark matter decay with IceCube HESE data

The IceCube detection of High Energy Starting Events (HESE) and the upward muon track events (6 year data) are presently hard to explain with the single power-law astophysical flux for energies above 30TeV.  We investigate the possibility that a significant component of the additional neutrino flux originates due to the decay of a very heavy dark matter particle via several possible channels into standard model particles. We perform a full 4 parameter fit to IceCube data in which we vary astrophysical flux normalization, power-law index, dark matter mass, dark matter lifetime and dark matter decay mode. We show that that dark matter with mass in the PeV range and the lifetime around 10^27s provides much better fit to IC data than the best-fit astrophysical flux alone. We also find dark matter lifetime limits which are much stronger that those obtained from gamma-ray data for all channels except $ b \bar{b}$, which is also disfavored by the IceCube HESE data.

Speaker: Prof. INA SARCEVIC (UNIVERSITY OF ARIZONA)

Slides DPF2017_Sarcevic.pdf

11:25 AM Searching for Dwarf Galaxies with DECam

Milky Way satellite dwarf galaxies are some of the oldest, smallest, and most dark matter dominated galaxies in the known universe. The study of these tiny dwarf galaxies can help shed light on the nature of dark matter and the mysteries of galaxy formation. Over the last two years, efforts using the Dark Energy Camera (DECam) have nearly doubled the known population of Milky Way satellite galaxies. However, to date, only a fraction of the southern sky has been uniformly imaged by DECam. I will present results from two new surveys, the Magellanic Satellites Survey (MagLiteS) and the Blanco Imaging of the Southern Sky (BLISS) survey, which are using DECam to image the southern sky at unprecedented depths.

Speaker: Alex Drlica-Wagner (Fermilab)

Slides DPF-2017-v1.pdf

11:45 AM Constraining the Nature of Dark Matter with the Milky Way Satellite Galaxies

The census of Milky Way satellite galaxies provides crucial tests of both galaxy formation models and the broader Cold Dark Matter paradigm. A total of 27 new Milky Way satellite candidates have been discovered in the last two years, primarily in data from the Dark Energy Survey. These discoveries may represent a 100% increase in the number of known Milky Way satellite galaxies, leading a huge advance in solving the missing satellite problem, if spectroscopic follow-up observations confirm the majority of these systems are dark matter dominated dwarf galaxies. Furthermore, many of these newly discovered dwarf galaxies are excellent targets for providing constraints on WIMP dark matter cross section and MACHO dark matter abundance with the spectroscopic follow-up analysis. In this talk, I will present the initial results from a spectroscopic campaign on the newly discovered dwarf galaxy candidates using 4-8 meter class telescopes in the southern hemisphere.

Speaker: Ting Li (Fermilab)

Slides DPF_Li.pdf DPF_Li.pptx

12:00 PM Study of Galaxy Evolution in DES Clusters

Clusters of galaxies represent a powerful probe for cosmology in the era of large photometric surveys such as the Dark Energy Survey. At the same time, understanding the astrophysical processes that drive their evolution is needed for a correct cosmology: cluster galaxies show particular properties with respect to field galaxies, processes like cluster membership selection often require knowledge of clusters and galaxy evolution. In particular, the efficiency with which halos convert the matter they contain into stars is still matter of debate and it is crucial for understanding galaxy formation and evolution. We present a measurement of the stellar-to-halo mass relation for the DES Year 1 redmapper clusters, showing the results for centrals, satellites and total content. We also explore the evolution of the fraction of blue galaxies and the star formation rate. We show that stellar mass is also a powerful mass proxy for clusters by comparing our results to X-ray temperature measurements that overlap with the DES Y1 footprint.

Speaker: Antonella Palmese (Fermilab/UCL)

Slides DPF_July17.pdf

10:45 AM → 12:15 PM Dark Matter: Monday morning

Convener: Prof. Rafael Lang (Purdue University)

10:45 AM Dark matter collider at DUNE: relativistic scattering of boosted dark matter

I will talk about a novel dark matter (DM) detection strategy for the models with non-minimal dark sector such as "inelastic boosted DM", which expects a secondary cascade signature after an inelastic and relativistic scattering of a light dark matter component. I will discuss the detection prospects at DUNE. The boosted DM can be produced both in the current universe and in the fixed target.

Speaker: Dr Seodong Shin (Yonsei University)

Slides DPF2017_Shin.pdf

11:00 AM The SuperCDMS Soudan High Mass Analysis

The SuperCDMS Soudan experiment searches for direct interactions of WIMP dark matter particles with germanium nuclei. The experiment uses detectors (iZIPs) with sophisticated ionization and phonon sensors to distinguish nuclear-recoils from electron-recoil backgrounds or surface contaminants. We report the result of an analysis, based on a ∼1700 kg-day exposure, that seeks to maximize our experimental sensitivity to spin-independent WIMP-nucleon interaction in the high mass regime (M > 10 GeV/c^2).

Speaker: Mr Brett Cornell (Caltech)

Slides DPF_2017_v3.pdf DPF_2017_v3_wide.pdf

11:15 AM Dark Matter Search Results from the PICO-60 C3F8 Bubble Chamber

The PICO-60 dark matter detector has recently concluded its first run with a C3F8 target, producing a new world-leading limit on WIMP-proton spin-dependent interactions, a factor of 17 stronger than PICO’s previous leading result. This result is obtained from a blind 30 live-day run that contained zero WIMP candidate events and re-affirms the dominance of the bubble chamber technology in searching for this type of interaction. The absence of events confirms that the bubble chamber technology is background-free and ready for future ton-scale dark matter detectors.

Speaker: Dr Orin Harris (NEIU)

Slides Orin_APS2017_wide.pdf Orin_APS2017_wide.pptx

11:30 AM The SENSEI project

We present the status and prospects of the Sub-Electron Noise Skipper Experimental Instrument (SENSEI) currently operating in the MINOS cavern at Fermilab. SENSEI uses a non-destructive readout technique to achieve stable readout for a thick fully depleted silicon CCD in the far sub-electron regime (∼ 0.05 e- rms/pix). This is the first instrument to achieve discrete sub-electron counting reproducibly over millions of pixels on a stable, large-area detector. This innovative technology has nearly immediate implications for a wide range of scientific disciplines including Dark Matter Direct detection experiments, astronomy and fundamental particle physics.

Speaker: Dr Javier Tiffenberg (Fermilab)

Slides dpf_SENSEI.pdf

11:45 AM The DAMIC Experiment at SNOLAB

Millimeter-thick charge-coupled devices (CCDs) are outstanding particle detectors. Although initially developed for near-infrared astronomy, the low pixel noise also makes them the most sensitive detectors to signals from ionizing radiation. By virtue of their very low energy threshold (<100 eV of ionizing energy) and their unique capabilities for background characterization based on their high spatial resolution, CCDs are poised to become the leading technology in the search for a wide variety of dark matter candidates with masses in the range 1 eV/c/c – 10 GeV/c/c. I will present the status of the DAMIC100 experiment, an ongoing direct dark matter search consisting of an array of 16-Mpixel CCDs hosted in the low-radioactivity environment of the SNOLAB underground laboratory. I will also discuss the recent progress toward DAMIC-1K, a lower-background 1-kg CCD dark matter detector with an ionization threshold of 2 electrons.

Speaker: Dr Juan Estrada (FNAL)

Slides chavarria_damic.pdf

12:00 PM Light Dark matter eXperiment

The Light Dark Matter eXperiment (LDMX) proposes a high-statistics search for dark matter in fixed-target electron-nucleus collisions, ultimately exploring thermal relic dark matter over most of the viable sub-GeV mass range to a decisive level of sensitivity. To achieve this goal, LDMX employs the missing momentum technique, where electrons scattering in a thin target can produce dark matter via “dark bremsstrahlung” giving rise to significant missing momentum and energy in the detector. To identify these rare signal events, LDMX individually tags incoming beam-energy electrons, unambiguously associates them with low energy, moderate transverse-momentum recoils of the incoming electron, and establishes the absence of any additional forward-recoiling charged particles or neutral hadrons. LDMX will employ low mass tracking to tag incoming beam-energy electrons with high purity and cleanly reconstruct recoils. A high-speed, granular calorimeter with MIP sensitivity is used to reject the high rate of bremsstrahlung background at trigger level while working in tandem with a hadronic calorimeter to veto rare photo nuclear reactions. This talk will summarize the small-scale detector concept for LDMX, ongoing performance studies, and near future prospects.

Speakers: Andrew Whitbeck (Fermilab), Dr Philip Schuster (SLAC)

Slides LDMX_DPF2017_v3.pdf

10:45 AM → 12:15 PM Higgs and EWSB: Monday morning

Convener: Prof. Tulika Bose (Boston University)

10:45 AM Higgs-boson physics at the LHC: from discovery to precision physics.

The LHC Higgs-boson physics programme is broad and challenging. The progress of experimental analyses has been matched by an unprecedented theoretical effort to describe both production and decay properties of the Standard-Model Higgs boson. In most cases the measurement of Higgs production and properties is not limited these days by theoretical systematic, but cases still exist where this is the case. In these cases, further effort to reach a more satisfactory theoretical accuracy will have to be matched by a dedicated program of experimental measurements. In this talk I will review the interplay between theory and experiments in defining a Higgs precision-physics program, and I will discuss how, when combined with global electroweak precision fits, this can be used to constrain extensions of the Standard Model.

Speaker: Laura Reina (Florida State University)

Slides dpf2017.pdf

11:15 AM Measurement of Higgs boson production in the diphoton decay channel with the ATLAS experiment

The measurement of the production cross section of the Higgs boson in the diphoton decay channel is presented, using proton-proton collision data collected at √s=13 GeV by the ATLAS experiment 2015 and 2016. Diphoton candidate events from different production modes are analyzed by a simultaneous fit to the invariant mass spectrum.

Speaker: Zirui Wang (Shanghai Jiao Tong Univ. / U.Michigan)

Slides wangzr201708DPF.pdf

11:35 AM Inclusive search for boosted SM Higgs bosons using H to bb decays with the CMS detector at 13 TeV

We present an inclusive search for the standard model Higgs boson produced with high transverse momentum decaying to a bottom-antibottom quark pair using a data set of pp collisions at 13 TeV collected with the CMS experiment at the LHC in 2016. The data sample corresponds to an integrated luminosity of 35.9 inverse femotbarns. High-transverse-momentum Higgs bosons are reconstructed in a single jet with opening angle corresponding to R = 0.8. Jet substructure and dedicated b-tagging techniques are used to identify boosted H to bb.

Speaker: Javier Duarte (Fermilab)

Slides DPF_ggHbb_31July2017.pdf

11:55 AM Search for SM Higgs Boson in the H->tautau->mumu decay mode with the CMS experiment at 13TeV

A search for standard model (SM) Higgs bosons decaying into pairs of tau leptons and then to two muons plus (anti)-neutrinos are presented. The analysis is performed using data collected by the CMS detector in 2016 with 35.9 $fb^{-1}$ of integrated luminosity. This channel has been studied in three event categories with different jet multiplicities focusing on Higgs boson signal events produced via gluon-gluon fusion and vector boson fusion. A multivariate analysis with boosted decision trees (BDT) is used to suppress the large Drell-Yan background. The di-tau mass is reconstructed using a secondary-vertex fit (SVFit) algorithm using a maximum likelihood approach. Experimental limits are presented in all three categories extracted from two-dimensional maximum likelihood fit in the plane of reconstructed di-tau mass and BDT response.

Speaker: Ms Vallary Bhopatkar (Florida institute of Technology)

Slides APS_DPF2017_VBhopatkar_31July2017.pdf

10:45 AM → 12:10 PM Neutrino Physics: Monday morning

Convener: Dr JYOTI JOSHI (Brookhaven National Laboratory)

10:45 AM Sterile Neutrino Searches with NOvA

The existence of light sterile neutrinos would have profound implications for both particle physics and cosmology. The NOvA (NuMI Off-Axis ve Appearance) experiment is sensitive to new neutrino flavors through searches for the disappearance of the known active neutrinos from the NuMI beam over a baseline of 810 km. We describe the method used by NOvA to look for oscillations into sterile neutrinos, with a focus on the disappearance of neutral-current (NC) neutrino events. We present the results from the first NC Disappearance analysis using 6.05E20 POT of neutrino data, and discuss the status and outlook for ongoing and future sterile neutrino searches with NOvA, at both long and short baselines.

Speaker: Dr Gavin S. Davies (Indiana University)

Slides dpf17_gsdavies_nova_v3.pdf

11:03 AM The Short Baseline Near Detector at Fermilab

SBND (Short-Baseline Near Detector) is a 112 ton liquid argon TPC neutrino detector under construction on the Fermilab Booster Neutrino Beam. Together with MicroBooNE and ICARUS-T600, SBND will search for shortbaseline neutrino oscillations in the 1 eV^2 mass range. SBND will also perform detailed studies of the physics of neutrino-argon interactions, thanks to a data sample of millions of electron and muon neutrino interactions. Finally SBND plays an important role in the on-going R&D effort to develop the LArTPC technology, testing several technologies that can be used in a future kiloton-scale neutrino detectors for a long-baseline experiment. We will discuss the detector design, its current status, and the physics program.

Speaker: Dr José Ignacio Crespo-Anadón (Columbia University Nevis Laboratories)

Slides 20170731_JICrespoAnadon_DPF2017.pdf

11:21 AM Improved Search for a Light Sterile Neutrino at Daya Bay, and Combined Analysis with MINOS and Bugey-3

Reactor neutrino experiments are well-suited for probing the existence of a light sterile neutrino in the region of a sub-eV$^2$ mass splitting (largely unexplored until recently). Using eight functionally identical antineutrino detectors (ADs), the Daya Bay experiment measures the electron antineutrinos produced by six 2.9 GW commercial nuclear reactors located near Shenzhen, China. By combining 404 days of 8-AD data with 217 days of 6-AD data (previously reported), a sample of 1.2 million antineutrino candidates was used to test for oscillations to a sterile fourth neutrino in the mass range of $2\times 10^{-4}\, \lesssim \Dm241 \lesssim 0.3$ eV$^2$. Joint fits were performed for $\theta_{13}$, $\theta_{14}$, and $\Dm241$, dominated either by the ratio of the two near-hall spectra (for $\Dm241 \gtrsim 0.01$ eV$^2$) or the ratio of far to near-hall spectra (for smaller splittings). Independent fits were performed using two techniques, a covariance matrix approach and one using nuisance parameters, and limits were set using the Feldman-Cousins and CL$_s$ methods, respectively. The two methods were mutually consistent within expectation, and found no evidence for a sterile neutrino in the mass range considered. For $\Dm241 \lesssim$ 0.2 eV$^2$, 95\% C.L. limits of $\sin^22\theta_{14}\,\lesssim 0.01$ were set, forming the most stringent constraints to date in this region. Going further, sensitivity was extended for $0.2 \lesssim \Dm241 \lesssim 2$ eV$^2$ by including the results of the Bugey-3 short-baseline reactor experiment in a combined reanalysis. Finally, the addition of MINOS acclerator neutrino data enabled strong constraints to be set on $\sin^2 2\theta_{\mu e} = 4|U_{e4}|^2|U_{\mu4}|^2$, which governs the strength of the anomalous short-baseline signals claimed by the LSND and MiniBooNE experiments. This three-experiment joint analysis excludes the LSND/MiniBooNE allowed regions for $\Dm241 \lesssim 1$~eV$^2$ at 90\% C.L., significantly constraining the allowed parameter space for a four-flavor explanation of the ``anomaly.''

Speaker: Mr Matt Kramer (UC Berkeley)

Slides dayabay_sterile_dpf_talk.pdf

11:39 AM Evolution of the Reactor Antineutrino Flux and Spectrum at Daya Bay

The Daya Bay experiment has utilized eight functionally identical underground detectors to sample reactor antineutrino fluxes from three pairs of nuclear reactors in South China, accruing the largest reactor antineutrino sample to date. This talk will summarize Daya Bay’s most recent result, which presents observations of correlations between reactor core fuel evolution and changes in the detected reactor antineutrino flux and energy spectrum. Four antineutrino detectors in two experimental halls were used to identify 2.2 million inverse beta decays (IBDs) over 1230 days spanning multiple fuel cycles for each of Daya Bay’s six 2.9 GW reactor cores. A 10σ variation in IBD yield was found to be energy-dependent, rejecting the hypothesis of a constant antineutrino energy spectrum at 5.1 standard deviations. While measurements of the energy-dependence of this variation show general agreement with predictions from recent reactor models, the variation in integrated IBD yield disagrees with recent predictions at 3.1σ. This discrepancy indicates that an overall deficit in measured flux with respect to predictions does not result from equal fractional deficits from the primary fission isotopes 235U, 239Pu, 238U, and 241Pu. A 7.8% discrepancy between the observed and predicted 235U yield suggests that this isotope may be the primary contributor to the reactor antineutrino anomaly.

Speaker: Dr David Martinez Caicedo (Illinois Institute of Technology)

Slides Martinez_DPF_July31_2017.pdf

10:45 AM → 12:15 PM Particle Detectors: Monday morning

Convener: Mr Diego Tonelli (INFN Trieste)

10:45 AM Microhexcavity Plasma Panel Detectors

Plasma panel detectors are a variant of micropattern detectors that are sensitive to ionizing radiation. They are motivated by the design and operation of plasma display panels. The detectors consist of arrays of electrically and optically isolated pixels defined by metallized cavities embedded in a dielectric substrate. These are hermetically sealed gaseous detectors that use exclusively non-hydrocarbon gas mixtures. The newest variant of these “closed-architecture” detectors is known as the Microhexcavity plasma panel detector (µH-PPS), consisting of 2 mm wide, regular close-packed hexagonal pixels each with a circular thin-film anode. The fabrication, staging, and operation of these detectors is described. Initial tests with the µH-PPS detectors operated in Geiger mode yield Volt-level signals in the presence of ionizing radiation. The spontaneous discharge rate in the absence of a source is roughly 2-3 orders of magnitude lower compared to the rates measured using low energy betas.

Speaker: Alexis Mulski (University of Michigan)

Slides amulski_uHexCavity_FINAL_DPF2017.pdf

11:03 AM Ultra long-lived particles searches with MATHUSLA

Many extensions of the Standard Model (SM) include particles that are neutral, weakly coupled, and long-lived that can decay to final states containing several hadronic jets. Long-lived particles (LLPs) can be detected as displaced decays from the interaction point, or missing energy if they escape. ATLAS and CMS have performed searches at the LHC and significant limits have been set in recent years. However, the current searches performed at colliders have limitations. A LLP does not interact with the detector and it is only visible once it decays. Unfortunately, no existing or proposed search strategy will be able to observe the decay of non-hadronic electrically neutral LLPs with masses above ~ GeV and lifetimes near the limit set by Big Bang Nucleosynthesis (cτ ~ 107-108 m). Therefore, ultra-long-lived particles (ULLPs) produced at the LHC will escape the main detector with extremely high probability. In this talk we describe the concept of the MATHUSLA surface detector (MAssive Timing Hodoscope for Ultra Stable neutraL pArticles), which can be implemented with existing technology and in time for the high luminosity LHC upgrade to find such ultra-long-lived particles, whether produced in exotic Higgs decays or more general production modes. The MATHUSLA detector will consist of resistive plate chambers (RPC) and scintillators with a total sensitive area of 200x200 m square. It will be installed on the surface, close to the ATLAS or CMS detectors. A small-scale test detector (~ 6 m square) is going to be installed on the surface above ATLAS in June 2017. It will consist of three layers of RPCs used for tracking and two layers of scintillators for timing measurements. It will be placed above the ATLAS interaction point to estimate cosmic backgrounds and proton-proton backgrounds coming from ATLAS during nominal LHC operations. We will report on the status of the test detector, on the on-going background studies, and plans for the main detector.

Speaker: Prof. Gordon Watts (University of Washington)

Slides gwatts gwatts

11:21 AM Overview of the CEPC Vertex Detector

he Circular Electron Positron Collider (CEPC) has been proposed to measure with unprecedented precision the Higgs properties as well as the electroweak parameters. Its vertex detector that will be located as close as possible to the interaction point, must be built with state-of-the-art pixel detector technologies. In the presentation, performance requirements including single point resolution, readout time, and radiation hardness against total ionization dose (TID) and non-ionization energy loss (NIEL) will be explained. Potential candidate technologies and their R&D progress will be discussed together with the detector layout optimization. In addition, a preliminary design of the complicated interaction, which has dramatical impacts on the vertex detector will be also presented

Speaker: Dr Hongbo Zhu (Institute of High Energy Physics)

Slides CEPC_VERTEX_HZHU-final.pdf

11:39 AM Optical Ring Resonators for HEP and Cosmology Applications

Optical ring resonators have been used in telecommunications and other fields, but so far not in HEP. Used as wavelength notch filters, they could have a major impact in reducing infrared sky background for future cosmology surveys. Ring resonators also are a potential low mass, low power, fast, and compact technology for readout of pixel tracking detectors and/or implementing pattern triggering. We describe a current R&D effort in fabrication and testing prototype optical ring resonators for multiple HEP applications.

Speaker: Stephen Kuhlmann (Argonne National Laboratory)

Slides Kuhlmann_DPF_2017.pdf

11:57 AM The Construction and Commissioning of the Belle II iTOP Counter

The barrel-region particle identification detector is crucial for extending the physics reach of the Belle II experiment operating at the SuperKEKB accelerator. For this purpose, an imaging-Time-of-Propagation (iTOP) counter was developed, which is a new type of ring-imaging Cherenkov detector. The iTOP consists of 16 separate modules arranged azimuthally around the beam line. Each module consists of optical components fabricated from quartz (one mirror, one prism, and two bars), an array of micro-channel-plate photo-multiplier tubes (MCP-PMTs), and front-end electronics. The waveforms read out are processed by firmware, and the resulting pulse-heights and hit times are sent to the Belle II data acquisition system. The detector construction was completed and the detector installed by the summer of 2016, and since then the detector has undergone commissioning. This talk describes the construction and commissioning of the Belle II iTOP counter.

Speaker: Dr Boqun Wang (University of Cincinnati)

Slides boqunwg_DPF2017.pdf

10:45 AM → 12:15 PM QCD: Monday morning

Convener: Radja Boughezal (Argonne National Laboratory)

10:45 AM PDF Flavor Determination with LHC W/Z production

We use nCTEQ15 nPDFs with uncertainties to identify measurements which have a potential impact on nuclear corrections and flavor differentiation. In particular, recent LHC W/Z vector boson production data in proton-lead and lead-lead collisions are quite sensitive to heavier flavors (especially the strange PDF). This complements the information from neutrino-DIS data. As the proton flavor determination is dependent on nuclear corrections (from heavy target DIS, for example), this information can also help improve proton PDFs.

Speaker: Prof. Fredrick Olness (SMU)

Slides olness_DPF2017.pdf

11:15 AM Update on CTEQ-TEA PDFs

We present recent progress on the parton distribution functions (PDFs) of the proton from the CTEQ-TEA collaboration.

Speaker: Carl Schmidt (Michigan State University)

Slides DPF2017_crs.pdf

11:35 AM Refinement of the Pion PDF implementing Drell-Yan Experimental Data

The proton is more complex than a collection of three valence quarks. We realize that an abundance of “sea” quarks and gluons is crucial to understanding the mass and internal structure of the proton. The pion is intimately related with the proton as analyses indicate an effective pion cloud exists around the core valence structure. In the Drell-Yan (DY) process, two hadrons (such as protons or pions) collide, one donating a quark and the other donating an antiquark. The quark-antiquark pair annihilate, forming a virtual photon, which creates a lepton-antilepton pair. By measuring the cross-section of the dilepton pair, we obtain rich information about the parton distribution function (PDF) of the hadrons. The PDF is the probability of finding a parton (quark, antiquark, or gluon) at a momentum fraction of the hadron, x, between 0 and 1. Experiments performed at Fermilab such as E866 and SeaQuest collect data in the DY process. Determining the pion PDFs from the DY process stems from understanding the abundance of sea quarks. Complementary to the DY process is deep inelastic scattering (DIS). Here, a target nucleon is probed by a lepton, and we investigate the pion cloud of the nucleon. The experiments H1 and ZEUS done at HERA at DESY collect DIS data. Both DY and DIS processes can measure small and large x depending on kinematics. Numerically, we have implemented the DY cross-section and have obtained the result consistent with (Becher, et al. 2008). Now, we perform a double-Mellin transform on the hard-scattering kernel to easily evolve the PDFs over energy scales as in (Stratmann and Vogelsang, 2001). We present some preliminary fits of pion PDFs to DY datasets from Fermilab-E615 and CERN-NA10. We aim to perform a full NLO QCD global analysis and a state-of-the-art fitting technique to all available data for DY and DIS as in (McKenney, et al. 2016) to determine pion PDFs more accurately in all x regions.

Speaker: Mr Patrick Barry (North Carolina State University)

Slides Barry_Patrick_DPF_7_31_17.pdf

11:55 AM Are PDFs still consistent with Tevatron data?

As active data taking has moved to the LHC at CERN, more and more LHC data have been included into fits of parton distribution functions. An anomaly has arisen where formerly excellent agreement between theoretical predictions and experiment in single-top-quark production at the Tevatron is no longer very good. Is this indicative of a deeper issue?

Speaker: Prof. Zack Sullivan (Illinois Institute of Technology)

Slides ZS_DPF17.pdf

10:45 AM → 12:15 PM Quark and Lepton Flavor: Monday morning

Convener: Prof. Alexey Petrov (Wayne State University / MCTP)

10:45 AM The Mu2e Experiment at Fermilab

Searching for Muon to electron conversion : The Mu2e experiment at Fermilab The Mu2e experiment will measure the charged-lepton flavor violating (CLFV) neutrino-less conversion of a negative muon into an electron in the field of a nucleus. The conversion process results in a monochromatic electron with an energy slightly below the muon rest mass (104.97 MeV). Mu2e will improve the previous measurement by four orders of magnitude using a new technique, reaching a SES (single event sensitivity) of 2.5 x 10^{-17} on the conversion rate. The experiment will reach mass scales of nearly 10^4 TeV, far beyond the direct reach of colliders. The experiment is sensitive to a wide range of new physics, complementing and extending other CLFV searches. Mu2e is under design and construction at the Muon Campus of Fermilab; we expect to start in 2020 with 3 years of running from 2021 to 2023.

Speaker: Dr Yuri Oksuzian (Univeristy of Virginia)

Slides Mu2eDPF2017.pdf

11:03 AM Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry

Combining Pati-Salam (PS) and flavour symmetries in a renormalisable setup, we devise a scenario which produces realistic masses for the charged leptons. Flavour-symmetry breaking scalar fields in the adjoint representations of the PS gauge group are responsible for generating different flavour structures for up- and down-type quarks as well as for leptons. The model is characterised by new heavy fermions which mix with the Standard Model quarks and leptons. In particular, the partners for the third fermion generation induce sizeable sources of flavour violation. Focusing on the charged-lepton sector, we scrutinise the model with respect to its implications for lepton-flavour violating processes such as $\mu \rightarrow e\gamma$, $\mu\rightarrow 3e$ and muon conversion in nuclei.

Speaker: Paul Moch (Theoretische Physik 1, University of Siegen)

Slides DPF2017Moch.pdf

11:21 AM Lepton flavor violating meson decays

We argue that lepton flavor violating (LFV) decays $M \to \ell_1 \overline \ell_2$ of quarkonium and heavy quark meson states $M$ with different quantum numbers could be used to put constraints on the Wilson coefficients of effective operators describing LFV interactions at low energy scales. We note that the restricted kinematics of the two-body decay of quarkonium or a heavy quark meson allows us to select operators with particular quantum numbers, significantly reducing the reliance on the single operator dominance assumption that is prevalent in constraining parameters of the effective LFV Lagrangian. We shall also argue that studies of radiative lepton flavor violating $M \to \gamma \ell_1 \overline \ell_2$ decays could provide important complementary access to those effective operators.

Speaker: Mr Derek Hazard (Wayne State University)

Slides DPF_20170731.pdf

11:39 AM Flavor gauge models below the Fermi scale

In this talk I will construct a flavor model with a gauge boson below the weak scale. The model is viable and shows the synergy between low energy observables, meson decays, neutrino oscillations, and LHC physics. The role of neutrinos will be highlighted.

Speaker: Pedro Machado (Fermilab)

11:57 AM Gauge Model for Minimal Flavor Violation

We present a flavor gauge model based on $O(3)_L \times O(3)_R$ gauge symmetry, a maximal anomaly-free subgroup of the standard model flavor symmetry. In this model the fermion mass hierarchy has a dynamical origin. The model provides a UV complete realization of the Minimal Flavor Violation Hypothesis. Implications for quark sector and lepton sector flavor violation arising through higher dimensional effective operators involving the Higgs field are outlined. CP violation arising from these operators is also studied. Vector-like fermions responsible for the generation of the top quark, bottom quark, and the tau lepton masses are in the TeV range, and potentially within reach of the LHC.

Speakers: K.S. Babu (Oklahoma State University), Shaikh Saad (Oklahoma State University)

Slides Flavor_Babu.pdf

10:45 AM → 12:15 PM Top Quark Physics: Monday morning

Convener: Prof. Stephen Wimpenny (University of California - Riverside)

10:45 AM Top-pair and tW production at approximate N^3LO

I present approximate N^3LO theoretical results for top-antitop pair production and for single-top production in association with a W boson. The higher-order corrections are from soft-gluon radiation which is dominant near partonic threshold. I present results for total cross sections as well as transverse-momentum and rapidity distributions of the top quark and compare with data at LHC energies.

Speaker: Prof. Nikolaos Kidonakis (Kennesaw State University)

Slides Kidonakis-top.pdf

11:00 AM Measurement of quantum interference between doubly and singly resonant top quark production with the ATLAS experiment

Physics processes involving top quarks compose a major background for many searches for new physics. Both doubly-resonant "ttbar" and singly-resonant "single top" processes can contribute at similar levels where sophisticated tools are used to effectively reduce ttbar backgrounds. However, because both ttbar and Wt single top with an additional b-quark in the final state can yield an identical final state (WWbb) the processes quantum-mechanically interfere. The ambiguity in how this interference is modeled can lead to large theoretical uncertainties on the Wt prediction. A measurement is presented that is designed to probe the WWbb final state in a region of large interference, selecting final states with two isolated leptons and b-tagged jets. The result uses data from pp collisions delivered by the Large Hadron Collider in 2015 and 2016 at a center-of-mass energy of 13 TeV recorded by the ATLAS detector, corresponding to an integrated luminosity of 36/fb. Differential distributions of interference-sensitive variables are measured and subsequently unfolded to truth level. The analysis is sensitive to differences in the modeling of the interference term provided by state-of-the-art WWbb generators

Speaker: Theodor Christian Herwig (University of Pennsylvania)

Slides herwig.pdf

11:15 AM Measurement of the cross section of the production of a top quark pair in association with a photon in pp collisions at 8 TeV

A measurement of the cross section of top quark pairs produced in association with a photon is presented. The data were collected by the CMS experiment in proton-proton collisions at a center of mass energy of 8 TeV. The measurement is performed in the electron+jets and muon+jets final state. The fiducial cross section for top quark pair plus photon production is measured in the phase space corresponding to the semileptonic decay of the top quark pair with a 25 GeV photon, and is measured relative to the cross section of inclusive top quark pair production.

Speaker: Daniel Noonan (Florida Institute of Technology)

Slides DPF_TTGamma_DNoonan.pdf

11:30 AM Measurement of the $t\bar{t}$ spin correlations and top quark polarization in dileptonic channel

The degree of top polarization and strength of $t\bar{t}$ correlation are dependent on production dynamics, decay mechanism, and choice of the observables. At the LHC, measurement of the top polarization and spin correlations in $t\bar{t}$ production is possible through various observables related to the angular distribution of decay leptons. A measurement of differential distribution provides a precision test of the standard model of particle physics and probes for deviations, which could be a sign of new physics. In particular, the phase space for the super-symmetric partner of the top quark can be constrained. We present updates to the recent top quark polarization and spin correlation studies in dileptonic channel at the Compact Muon Solenoid experiment.

Speaker: Dr Ajeeta Khatiwada (Purdue University)

Slides DPF2017.pdf

11:45 AM Measuring Polarized Gluon Distributions by Heavy Quark Spin Correlations and Polarizations

The production of heavy flavor quark pairs, including top-anti-top, at the LHC proceeds primarily through gluon fusion. The correlation between the gluon spins affects various spin correlations between the produced quark and anti-quark. Both single spin asymmetries and double correlations of the quark pair spins will be manifest in the subsequent hadronization and decay distributions. For top pairs this is most pronounced. Dilepton, single lepton, and purely hadronic top pair decay channels allow for the extraction of gluon spin information as well as providing a window into possible interactions Beyond the Standard Model. The derivations of many spin related asymmetries and polarizations will be presented. The implications for experimental determination will be discussed.

Speaker: Prof. Gary Goldstein (Tufts University)

Slides DPF2017_Goldstein.pdf

12:00 PM Forward-backward asymmetry in pp̄ → tt̄ events at the Tevatron

We discuss the complete overview of the forward-backward asymmetry measurements in the angular distributions of pp̄ → tt̄ events at the Tevatron collider. These measurements use the full Run II data set in lepton plus jets and dilepton channels, recorded in the D0 and CDF detectors, corresponding to an integrated luminosity of ≈ 2 × 10 fb −1 . The combinations of inclusive and differential asymmetries are presented and compared with the NNLO QCD predictions.

Speakers: Collaboration CDF (Fermilab), Collaboration D0 (Fermiab), Ziqing Hong (Northwestern University)

Slides 07312017.pdf

12:15 PM → 1:30 PM Lunch

12:30 PM DOE PIs Meeting: HEP Civics

Speaker: Dr Michael Cooke (U.S. Department of Energy)

12:30 PM → 1:15 PM Meetings with DOE Representatives: HEP Civics

Convener: Dr Michael Cooke (U.S. Department of Energy)

12:30 PM HEP Civics

Speaker: Dr Michael Cooke (U.S. Department of Energy)

Slides 2017-07-31_DOE_HEP_and_the_Federal_Budget_Process_v4.pdf

1:30 PM → 3:15 PM Beyond Standard Model: Monday afternoon

Convener: Dr Bjoern Penning (Fermilab/UChicago)

1:30 PM Searches for electroweakly produced supersymmetry with CMS

In supersymmetry, most solutions to the hierarchy problem feature light higgsinos, since it is the most important ingredient to stabilize the Standard Model higgs mass. Light higgsinos, however, are notoriously difficult to detect. This talk will outline the challenges of finding higgsinos and present various search results and techniques, that focus on supersymmetric models where colored sparticles are out of reach at the LHC and electroweakino production is the dominant process beyond the Standard Model. The searches are performed on data corresponding to an integrated luminosity of 36 fb-1 and a center of mass energy of 13 TeV, recorded with the CMS detector at the CERN LHC in 2016.

Speaker: Mr Basil Schneider (FNAL)

Slides BasilSchneider_20170731_dpf.pdf

1:46 PM Search for compressed supersymmetry using low pT leptons and missing transverse energy with the ATLAS detector

A search is presented for the electroweak production of gauginos, the supersymmetric partners of the Standard Model gauge bosons, in a scenario where the mass difference between the lightest supersymmetric particle (LSP) and other light gauginos is small, resulting in decays to virtual W/Z bosons and the LSP. The search is based on 36 fb^-1 of sqrt(s) = 13 TeV data collected by the ATLAS detector at the LHC in 2015 and 2016. The signature is two or three low transverse momentum (pT) charged leptons (e, mu) and large missing transverse energy, which is enhanced by requiring a high pT initial state radiation jet. The use of very low pT leptons poses challenges for triggering, particle identification, and background estimation.

Speaker: Joseph Reichert (University of Pennsylvania)

Slides 2017-07-31_DPF_Compressed_SUSY_with_ATLAS.pdf

1:58 PM Search for electroweak production of supersymmetric particles in the two and three lepton final state at $\sqrt s = 13$ TeV with the ATLAS detector

Supersymmetry gives a solution to naturalness as well as a candidate for dark matter by predicting a new bosonic (fermionic) partner for each Standard Model fermion (boson). Searches for electroweak production of supersymmetric particles decaying via sleptons and gauge bosons, $W$ and $Z$, to final states with two or three leptons and missing transverse momentum were performed with the ATLAS detector. The search uses proton-proton collisions at $\sqrt s = 13$ TeV recorded with the ATLAS detector at the LHC during 2015 and 2016 corresponding to $36fb^{-1}$. No significant excesses over the Standard Model were observed so exclusion limits are set on masses of the gauginos, the supersymmetric partners of $W^{\pm}$, $Z^{0}$, and $h$, in simplified models.

Speaker: Elodie Resseguie (University of Pennsylvania)

Slides 171731_dpf_er.pdf

2:14 PM One-loop effects on Z boson decays in the SM EFT

I will present partial one-loop corrections to SM EFT parameterizations of new physics effects on Z boson decays, and discuss the impact of LEP I data on SM EFT fits. The findings indicate that any measurement which reaches percent-level sensitivity to new physics effects in Z decays, like the precise LEP data, cannot be consistently used at higher precision to reach fixed conclusions on Wilson coefficients, as too many operators contribute at loop level which are currently not constrained in a consistent EFT treatment. This work motivates further effort in understanding the correct treatment of high energy, non-resonant data in an EFT context.

Speaker: Dr William Shepherd (JGU Mainz)

Slides EFT_DPF.pdf

2:30 PM Little hierarchy in the minimally specified MSSM

We study constrained versions of the minimal supersymmetric model and investigate the hierarchy between the electroweak scale and the scale of superpartners that can be achieved without relying on specifying model parameters by more than one digit. This approach automatically avoids scenarios in which a large hierarchy is obtained by special choices of parameters and yet keeps scenarios that would be otherwise disfavored by various sensitivity measures. We consider models with universal gaugino and scalar masses, models with non-universal Higgs masses or non-universal gaugino masses and focus on scenarios in which all the model parameters are either of the same order or zero at the grand unification scale. We find that the maximal hierarchy between the electroweak scale and stop masses, requiring that model parameters are not specified beyond one digit, ranges from a factor of 30 for the CMSSM up to 300 for models with non-universal Higgs or gaugino masses.

Speaker: Prof. Radovan Dermisek (Indiana University)

Slides Dermisek_DPF_July_31_2017.pdf

2:46 PM Imposing LHC constraints on the combined Anomaly and Z'-Mediation mechanism of Supersymmetry Breaking

Combining anomaly with Z' mediation of SUSY breaking allows us to solve the tachyonic problem of the former and avoid fine tuning in the latter. This scenario includes an extra U(1)' gauge symmetry and extra singlet scalar S which provides a solution to the ‘µ problem’ of the MSSM. The low-energy particle spectrum is calculated from the UV inputs using the Renormalization Group Equations. The benchmark points considered in the original model, suggested before the Higgs discovery, predicted a Higgs mass close to the current measured value of 125 GeV. We use the current LHC data to update the predictions of the model, its particle spectrum and in particular the mass of the Z' gauge boson.

Speaker: Mr Joydeep Roy (Wayne state University)

Slides DPF2017_ROY.pdf

3:01 PM Critical behavior of SU(3) lattice gauge theory with 12 light flavors

It is expected that when the number of light flavors of QCD-like theories is increased beyond some critical value, a transition having some Kosterlitz-Thouless features occurs. We report numerical results for a four-dimensional SU(3) lattice gauge theory with 12 flavors of unimproved staggered fermions. We show that the scaling of the imaginary part of the zeros of the partition function in the complex coupling plane is consistent with a first order phase transition for small values of the mass. We report searches for the endpoint of the line of first order phase transition in the mass-coupling plane. A light and weakly interacting scalar is expected near this endpoint. We present recent calculations of the second-order Renyi entanglement entropy for the two-dimensional O(2) model and show that it allows to delimit the Kosterlitz-Thouless phase in the chemical potential-coupling plane. We discuss the possibility of calculating this quantity for gauge theories with fermions.

Speaker: Yannick Meurice (U. of Iowa)

Slides dpf17.pdf

1:30 PM → 3:15 PM Computing, Analysis Tools, and Data Handling: Joint session with Particle Detectors, Monday afternoon

Convener: Matthew Judah (Colorado State University)

1:30 PM The Calorimeter Global Feature Extractor (gFEX) for the Phase-I Upgrade of the ATLAS experiment

The ATLAS Level-1 calorimeter trigger is planning a series of upgrades in order to face the challenges posed by the upcoming increase of the LHC luminosity. The upgrade will benefit from the new front end electronics for parts of the calorimeter which provide the trigger system with digital data with a tenfold increase in granularity. The Global Feature Extractor (gFEX) module is one of the updates of the Level-1 calorimeter trigger project. This unique single ATCA board will use 3 processor Xilinx Ultra-scale FPGAs for data processing and one Xilinx Ultra-scale+, multi-processor system-on-chip, ZYNQ, for configuring all of the processor FPGAs and monitoring the board status and environment. It will allow the identification in real time of large radius jets for capturing Lorentz-boosted objects such as top quarks, Higgs, Z and W bosons, as well as the calculation of global event variables such as missing transverse energy, centrality for heavy ion collisions and event-by-event pile-up subtraction which are fundamental for the LHC physics studies. Extensive simulation studies are carried out to understand and optimise the characteristics of gFEX. Prototypes have been built and extensively tested to prepare for the final steps and the production of the modules. The design of the final gFEX module as well as the performance of the prototypes will be presented.

Speaker: Giordon Stark (University of Chicago)

Slides DPF2017_gFEX.pdf

1:47 PM The ATLAS New Small Wheel Trigger

The New Small Wheel (NSW) is a major upgrade to the muon spectrometer of the ATLAS experiment, which will be installed in 2019-2020. The NSW will comprise both sTGC and Micromegas detectors. One of the major goals on the upgrade is fast, precise muon reconstruction in hardware to allow triggering on single muon events in high pileup environments. This talk presents the status of the NSW trigger and integration into the NSW electronics readout path, with emphasis on the test stand at Harvard taking cosmic ray muon data with an octuplet of prototype Micromegas chambers.

Speaker: Alexander Tuna (Harvard University)

Slides Tuna-2017-07-30-ATLASNSWTrigger.pdf

2:04 PM Instantaneous luminosity calibration of the ATLAS experiment with $Z\to \mu ^{-} \mu ^ {+}$

In this talk, a new method of calibrating the instantaneous luminosity of the ATLAS experiment with $Z\to \mu \mu $ process is presented. At the designed center-of-mass energy of the LHC, cross-section of $Z\to \mu \mu $ process is known to a very high precision and has a very good production rate (~1000 events/minute), which makes it suitable for luminosity measurement. Leading systematic uncertainties in this method come from the Standard Model theory, which are totally different compared to the leading systematic uncertainties on the current ATLAS luminosity measurement based on the Van der Meer method. A comparison of results with the official ATLAS luminosity measurements is presented for the entire data collected in 2015 and 2016.

Speaker: Mr Harish Potti (University of Texas at Austin)

Slides Harish_DPF_Zlumi.pdf

2:21 PM Mu2e Trigger & DAQ Design and Challenges

The Mu2e experiment at Fermilab aims to measure the charged-lepton flavor violating neutrinoless conversion of a negative muon into an electron, producing a monochromatic electron with an energy slightly below the rest mass of the muon (104.97 MeV). We expect to set a limit on the ratio between the muon conversion and capture rate of 6.7 × 10^−17 at 90% CL in three years of running using a pulsed μ- beam that should provide ~10^18 stopped muons on an aluminum target. A critical component of the experiment is the Trigger and Data Acquisition (TDAQ) subsystem. The TDAQ is responsible for collecting data from the detector subsystems, as well as generating and distributing timing information to synchronize the subsystems. The TDAQ also controls the operating modes for each event window, and provides monitoring and operator interfaces. Before delivering data to be processed offline, the TDAQ system must also provide online processing and filtering to achieve a rejection factor of 100 or more, resulting in approximately 7 Petabytes of data per year. We present an overview of the TDAQ design and the progress of our development work as we seek to facilitate the accomplishment our physics goals.

Speaker: Dr Tomonari Miyashita (California Institute of Technology)

Slides Miyashita.pdf

2:38 PM The ATLAS Trigger algorithms upgrade and performance in Run 2 (TDAQ)

The ATLAS trigger has been used very successfully for the online event selection during the first part of the second LHC run (Run-2) in 2015/16 at a center-of-mass energy of 13 TeV. The trigger system is composed of a hardware Level-1 trigger and a software-based high-level trigger; it reduces the event rate from the bunch-crossing rate of 40 MHz to an average recording rate of about 1 kHz. The excellent performance of the ATLAS trigger has been vital for the ATLAS physics program of Run-2, selecting interesting collision events for wide variety of physics signatures with high efficiency. The trigger selection capabilities of ATLAS during Run-2 have been significantly improved compared to Run-1, in order to cope with the higher event rates and pile-up which are the result of the almost doubling of the center-of-mass collision energy and the increase in the instantaneous luminosity of the LHC. At the Level-1 trigger the undertaken improvements resulted in more pile-up robust selection efficiencies and event rates and in a reduction of fake candidate particles. A new hardware system, designed to analyze event-topologies, supports a more refined event selection at the Level-1. A hardware-based high-rate track reconstruction, currently being commissioned, enables the software trigger to make use of tracking information at the full input rate. Together with a re-design of the high-level trigger to deploy more offline-like reconstruction techniques, these changes improve the performance of the trigger selection turn-on and efficiency to nearly that of the offline reconstruction. In order to prepare for the anticipated further luminosity increase of the LHC in 2017/18, improving the trigger performance remains an ongoing endeavor. Thereby coping with the large number of pile-up events is one of the most prominent challenges. This presentation gives a short review the ATLAS trigger system and its performance in 2015/16 before describing the significant improvements in selection sensitivity and pile-up robustness, which we implemented in preparation for the expected highest ever luminosities of the 2017/18 LHC.

Speaker: Catrin Bernius (SLAC)

Slides DPF2017_CBernius_TrigAlgos_final.pdf

2:55 PM The ATLAS Trigger Menu design for higher luminosities in Run 2 (TDAQ)

The ATLAS experiment aims at recording about 1 kHz of physics collisions, starting with an LHC design bunch crossing rate of 40 MHz. To reduce the large background rate while maintaining a high selection efficiency for rare physics events (such as beyond the Standard Model physics), a two-level trigger system is used. Events are selected based on physics signatures such as the presence of energetic leptons, photons, jets or large missing energy. The trigger system exploits topological information, as well as multivariate methods to carry out the necessary physics filtering for the many analyses that are pursued by the ATLAS community. In total, the ATLAS online selection consists of nearly two thousand individual triggers. A Trigger Menu is the compilation of these triggers, it specifies the physics selection algorithms to be used during data taking and the rate and bandwidth a given trigger is allocated. Trigger menus must reflect the physics goals of the collaboration for a given run, but also take into consideration the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout and offline processing farm. For the 2017 run, the ATLAS trigger has been enhanced to be able to handle higher instantaneous luminosities (up to 2.0x10^{34}cm^{-2}s^{-1}) and to ensure the selection robustness against higher average multiple interactions per bunch crossing. In this presentation we describe the design criteria for the trigger menu for Run 2. We discuss several aspects of the process of planning the trigger menu, starting from how ATLAS physics goals and the need for detector performance measurements enter the menu design, and how rate, bandwidth, and CPU constraints are folded in during the compilation of the menu. We present the tools that allow us to predict and optimize the trigger rates and CPU consumption for the anticipated LHC luminosities. We outline the online system that we implemented to monitor deviations from the individual trigger target rates and to quickly react to changing LHC conditions and data taking scenarios. Finally we give a glimpse of the 2017 Trigger Menu, allowing the listener to get a taste of the vast physics program that the trigger is supporting.

Speaker: Heather Russell (McGill University)

Slides 20170731_Final.pdf

1:30 PM → 3:15 PM Dark Matter: Monday afternoon

Convener: Prof. Enectali Figueroa-Feliciano (Northwestern University)

1:30 PM LUX, and the Combating of the Lamppost Effect

New results from the Large Underground Xenon (LUX) detector, a 100-kg-scale, 2-phase xenon direct dark matter search experiment, will be shared. Dark matter, the missing ~25% of the mass-energy content of the universe, is sought in new ways, using effective field theory operators to extend the search to higher-mass Weakly Interacting Massive Particles (WIMPs), spin-dependent interaction operators, and electron instead of nuclear recoil, to seek axions. In addition, 2-neutrino double electron capture of 124Xe will be explored. Lastly, both old and new calibrations and position and energy reconstruction techniques will be reviewed, in the context of the new background and signal models being developed by LUX.

Speaker: Prof. Matthew Szydagis (University at Albany, SUNY)

Slides lux_szydagis_dpf.pdf

1:45 PM First Dark Matter Search Results from the XENON1T Experiment

XENON1T is the current experiment of the XENON dark matter search program based on dual-phase (liquid-gas) xenon time projection chambers (TPCs) of increasing target mass and decreasing background. The experiment was constructed and assembled over the past 3 years at the INFN Laboratori Nazionali del Gran Sasso (LNGS). The XENON1T detector is the first multi-ton scale liquid xenon (LXe) TPC containing a total of 3200 kg of ultra-pure LXe of which 2000 kg are active. Commissioning of the LXe TPC and the surrounding muon veto water Cherenkov detector, as well as associated cryogenics and purification plants was completed during the fall of 2016. A blind analysis of 1042 kg fiducial mass and 34.2 live days of data acquired between November 2016 and January 2017 was performed. XENON1T continues to take data following a short break caused by the January 18, 2017 earthquake. The results from this first dark matter search and outlook for the science program with XENON1T will be presented.

Speaker: Chris Tunnell (University of Oxford)

2:00 PM The XENONnT Dark Matter Experiment

With XENON1T leading the search for dark matter, the XENON collaboration has started to plan an upgrade of the detector for the next phase, referred to as XENONnT. The XENONnT experiment will utilize the already built and functioning XENON1T infrastructures, such as the cryogenic system, Kr distillation system, and Xe storage and recovery system, with the time projection chamber (TPC) as the main upgrade. The upgraded XENONnT detector will be filled with 7.5 tons of ultra-pure liquid xenon, tripling the active liquid xenon target mass of XENON1T. About 500 low-radioactive three-inch R11410 PMTs will be used. Background from internal sources such as radon will be reduced. It will enable another order of magnitude improvement in dark matter search sensitivity compared to that of XENON1T, or accumulate statistics if a positive dark matter signal is observed by XENON1T. The detailed TPC upgrade plan, background control and reduction techniques, and predicted sensitivity reach will be presented.

Speaker: Prof. Kaixuan Ni (UC San Diego)

Slides XENONnT_DPF2017.pdf

2:15 PM The LUX-Zeplin Dark Matter Search: detector design and sensitivity

The nature and origin of Dark Matter are among the most compelling mysteries of contemporary science. For over three decades, physicists have been trying to detect Dark Matter particles via collisions on target nuclei, with little success. The LZ collaboration is designing a massive Dark Matter detector, to be installed at the 4850 level of the Sanford Underground Research Facility in Lead, South Dakota. This detector will feature 7 active tons of target nuclei and use the established liquid xenon TPC technology to achieve unprecedented sensitivity to a wide range of Dark Matter candidates. In this talk, I will discuss the design and sensitivity of the experiment, together with its status.

Speaker: Maria Elena Monzani (SLAC National Accelerator Laboratory)

Slides DPF2017_Monzani_LZ.pdf

2:30 PM Background Simulations for the LUX-ZEPLIN Experiment

The LUX-ZEPLIN experiment will use a seven tonne dual-phase xenon TPC for the direct detection of dark matter. Understanding and mitigating background signals are crucial in its aim to push to an unprecedented sensitivity for WIMPs. I will describe the methods used to assess these, including simulations that characterise the electron and nuclear recoil responses in the detector from both internal and external background sources. Combined with the results of ongoing radioactive assays, these give an estimate of the expected background rates. Suppression of these backgrounds is achieved through fiducialisation and a veto strategy involving anti-coincidence between the main TPC and outer detectors (an instrumented xenon ‘skin’ and liquid scintillator detector). Under the present background model, LZ is projected to have a baseline sensitivity, with 1000 live days, of 2.3 x 10-48 cm2 for a 40 GeV/c2 WIMP mass.

Speaker: Dr Amy Cottle (Fermi National Accelerator Laboratory)

Slides DPFTalk.pdf

2:45 PM ADMX - axion dark matter experiment

The ADMX experiment is now taking data that is sensitive for the first time to a possible QCD axion with couplings to photons that can provide a solution to the strong-CP problem and account for a sizable amount of the dark matter of the universe.

Speaker: Daniel Bowring (Fermilab)

Slides Bowring.pdf

3:00 PM Emission of Photons and Relativistic Axions from Axion Stars

The number of nonrelativistic axions can be changed by inelastic reactions that produce relativistic axions or photons. Any even number of nonrelativistic axions can scatter inelastically into two relativistic axions. Any odd number of axions can annihilate into two photons. This reaction produces a monochromatic radio-frequency signal at an odd-integer harmonic of the fundamental frequency set by the axion mass.The loss rates of axions from axion stars through these inelastic relations are calculated using the framework of a nonrelativistic effective field theory. Odd-integer harmonics of a fundamental radio-frequency signal provide a unique signature for collapsing axion stars or any dense configuration of axions.

Speaker: Mr Abhishek Mohapatra (The Ohio State University)

Slides DPF_Abhishek_Mohapatra_July31_2017_standard.pdf

1:30 PM → 3:15 PM Higgs and EWSB: Monday afternoon

Convener: Laura Reina (Florida State University)

1:30 PM Search for the dimuon decay of the Higgs boson with the ATLAS experiment

The Standard Model Higgs boson Yukawa coupling to dimuons offers an opportunity to study the Higgs interaction with second generation fermions. The Standard Model branching fraction of the Higgs decay to $\mu^+\mu^-$ is $2.2\times10^{−4}$, much smaller compared to the decays to the third generation lepton/quark pairs $\tau^+\tau^-$ and $b\bar{b}$, and the second generation quark pair $c\bar{c}$. Despite the low branching fraction, this channel has the highest trigger and particle identification efficiencies of the other listed decays as well as a comparatively small background. This makes this channel an attractive way to study the Higgs Yukawa coupling. The background to this channel is a dominant irreducible dimuon production from the Drell-Yan process, $Z/\gamma *\to\mu^+\mu^-$, which is $\approx1700$ times the signal rate. To increase our detection sensitivity we use three categories to tag events by the Higgs production mechanism: gluon-gluon fusion (ggF), vector boson fusion (VBF), and vector boson associated production (VH). This talk presents the strategies of the analysis and summarizes the results from Run 1 and Run 2 data (2015-2016). The new developments in event categorization and the detection sensitivity for the expected 150 $fb^{-1}$ data in Run 2 are also reported.

Speaker: Aaron White (University of Michigan)

Slides Aaron-DPF2017.pdf

1:50 PM Search for the Higgs Boson Decays into Dimuons at CMS

A search for the standard model Higgs boson decaying into a muon pair is presented. The analysis is conducted with pp collisions data collected at 13 TeV with CMS at the LHC. Observed and expected limits of are placed on the standard model Higgs cross section times branching ratio at the 95% confidence level.

Speaker: Sergei Gleyzer (University of Florida)

Slides HiggsDimuonsDPF.pdf HiggsDimuonsDPF.pptx

2:10 PM Combined measurements of the Higgs boson production and decay rates using pp collisions at √s = 13 TeV with the ATLAS Experiment

After the Higgs boson was discovered at the LHC in 2012, it is of great importance to study how the Higgs boson interacts with Standard Model particles. In this presentation, I will report on the combined measurements of Higgs boson production and decay rates using LHC Run 2 proton-proton collision data collected at the center-of-mass energy of 13 TeV by the ATLAS detector in 2015 and 2016. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a W or a Z boson or a pair of top quarks, and of multiple decay modes. I will also discuss how the measurements constrain the Higgs boson’s couplings to Standard Model particles as well as the existence of new physics.

Speaker: Hongtao Yang (University of Wisconsin-Madison)

Slides higgs_coupling_combination_hongtao_yang_20170731.pdf

2:30 PM Mass Dependence of Higgs Production at Large Transverse Momentum

The transverse momentum distribution of the Higgs at large $P_T$ is complicated by its dependence on three important energy scales: $P_T$, the top quark mass $m_t$, and the Higgs mass $m_H$. A strategy for simplifying the calculation of the cross section at large $P_T$ is to calculate only the leading terms in its expansion in $m_t^2/P_T^2$ and/or $m_H^2/P_T^2$. The expansion of the cross section in inverse powers of $P_T$ is complicated by logarithms of $P_T$ and by mass singularities. In this work, we consider the top-quark-loop contribution to the subprocess $q\bar{q}\to H+g$ at leading order in $\alpha_s$, which proceeds through a top quark loop. We show that the leading power of $1/P_T^2$ can be expressed in the form of a factorization formula that separates the large scale $P_T$ from the scale of the masses. All the dependence on $m_t$ and $m_H$ can be factorized into fragmentation amplitudes for $t \bar t \to H$ and for $t \bar t \to g$ and an endpoint contribution. This factorization approach will be useful for calculating the $P_T$ distribution at large $P_T$ to next-to-leading order in $\alpha_s$.

Speaker: Eric Braaten (Ohio State University)

Slides DPF2017.pdf

2:50 PM Radiative Decays of the Higgs Boson to a Pair of Fermions

We revisit the radiative decays of the Higgs boson to a fermion pair $h\rightarrow f\bar{f}\gamma$ where $f$ denotes a fermion in the Standard Model (SM). We include the chirality-flipping diagrams via the Yukawa couplings at the order $\mathcal{O}(y_f^2 \alpha)$, the chirality-conserving contributions via the top-quark loops of the order $\mathcal{O}(y_t^2 \alpha^3)$, and the electroweak loops at the order $\mathcal{O}(\alpha^4)$. The QED correction is about $Q_f^2\times {\cal O}(1\%)$ and contributes to the running of fermion masses at a similar level, which should be taken into account for future precision Higgs physics. The chirality-conserving electroweak-loop processes are interesting from the observational point of view. First, the branching fraction of the radiative decay $h \to \mu^+\mu^- \gamma$ is about a half of that of $h \to \mu^+\mu^-$, and that of $h \to e^+ e^- \gamma$ is more than four orders of magnitude larger than that of $h \to e^+ e^-$, both of which reach about $10^{-4}$. The branching fraction of $h \to \tau^+\tau^- \gamma$ is of the order $10^{-3}$. All the leptonic radiative decays are potentially observable at the LHC Run 2 or the HL-LHC. The kinematic distributions for the photon energy or the fermion pair invariant mass provide non-ambiguous discrimination for the underlying mechanisms of the Higgs radiative decay. We also study the process $h \to c\bar c \gamma$ and evaluate the observability at the LHC. We find it potentially comparable to the other related studies and better than the $h \to J/\psi\ \gamma$ channel in constraining the charm-Yukawa coupling.

Speaker: Xing Wang (University of Pittsburgh)

Slides Xing_Wang_DPF2017.pdf

1:30 PM → 3:15 PM Neutrino II: Monday afternoon

Convener: Prof. Sowjanya Gollapinni (University of Tennessee, Knoxville)

1:30 PM Signal Simulation and Processing in the MicroBooNE LArTPC

MicroBooNE is an 85-ton Liquid Argon Time Projection Chamber (LArTPC) and the first of a trio of LArTPCs in the Short Baseline Neutrino (SBN) program which will search for a light sterile neutrino and measure neutrino-argon interaction cross sections. Located in the Booster neutrino beam at Fermi National Accelerator Laboratory, MicroBooNE has been taking neutrino data since October 2015. In this talk, we will describe the reconstruction of the distribution of ionization electrons given the induced current in all wire planes. Owing to the ultra-low noise cold electronics inside the LAr, the first successful extraction of the ionization charge from the induction wire planes in single-phase LArTPCs has been achieved. This development opens up new possibilities for using charge information to assist the event reconstruction. Latest results of a quantitative evaluation of the signal processing using full TPC signal simulation and a comparison of data and Monte Carlo will be shown.

Speaker: Brian Kirby (Brookhaven National Lab)

Slides 20170731_DPF2017SignalSimulationProcessing.pdf

1:48 PM Design and Fabrication of the ProtoDUNE Dual Phase LArTPC

The WA105 protoDUNE Dual Phase Liquid-argon Time Projection Chamber (LArTPC) is a large demonstrator based on the GLACIER design, with a 6x6x6 m3 (a Dual-phase LArTPCs are one of the far detector technology options foreseen for the Deep Underground Neutrino Experiment (DUNE) at Fermilab. Dual Phase (DP) refers to the extraction of ionization electrons at the interface between liquid and gaseous argon and their amplification and collection in the gas phase. ProtoDUNE will be operating at the CERN neutrino platform test beam facility. It not only serves as the engineering prototype of the FD, but will also demonstrate the concept of a very large dual-phase LAr TPC and calibrate it with charged particle test beam. We will briefly discuss the actual dimension of the design, fabrication, testing, installation and commissioning of the detector components at CERN.

Speaker: Dr ANIMESH CHATTERJEE (The University of Texas at Arlington)

Slides DPF2017_Animesh_DPLArTPC.pdf

2:06 PM Recent progress on wire-cell tomographic reconstruction for LArTPC

The Deep Underground Neutrino Experiment (DUNE) will use the state-of-the-art massive Liquid Argon Time Projection Chambers (LArTPCs) to search for CP violation in the neutrino sector, proton decay, and supernova neutrinos. The 3D reconstruction of the particle trajectories in LArTPCs relies on multiple wire planes, which can be challenging due to the intrinsic ambiguity of identifying where along the wire the charge is deposited. In this talk, we present a novel 3D reconstruction method “Wire-Cell” inspired by the concept of tomography. Based on the independent measurements of the same charge from the three planes of wires, the 3D images of ionization charge can be efficiently reconstructed following the principle of compressed sensing utilizing mathematical techniques such as the L1 regularization. Current status and future prospects of the development will be reported.

Speaker: Dr Hanyu Wei (brookhaven national laboratory)

Slides Wirecell_DPF2017.pdf

2:24 PM Cold electronics preparation for the protoDUNE experiment

The main purpose of the DUNE experiment is to measure the CP-violation phase in long-baseline neutrino oscillations with a liquid-argon detector of unprecedented size. The DUNE detector will consist of a liquid-argon Time Projection Chamber. The protoDUNE detectors at CERN are prototypes of the full-scale DUNE experiment; their operation will provide important input for the success of DUNE. Cold electronics is one of the most challenging topics for DUNE and protoDUNE. The functionality of the front-end motherboard and warm interface board needs to be understood at a detailed level. In this talk, the integration test plan, as well as results of tests of the protoDUNE cold electronics will be presented.

Speaker: Dr Guang Yang (Stony brook university)

Slides FEMB_2017_721_gyang.pdf

2:42 PM Measurement of Electron Attenuation using Cosmic Ray Muons in the MicroBooNE Detector

The MicroBooNE experiment at Fermilab uses liquid argon time projection chamber (LArTPC) technology to study neutrino interactions in argon. A fundamental requirement for LArTPCs is to achieve and maintain a low level of electronegative contaminants in the liquid to minimize the capture of drifting ionization electrons. The attenuation time for the drifting electrons should be long compared to the maximum drift time, so that the signals from particle tracks that generate ionization electrons with long drift paths can be detected efficiently. In this talk, we present MicroBooNE’s measurement of electron attenuation using cosmic ray muons. The result yields a minimum electron 1/e lifetime of 18 ms under typical operating conditions, which is long compared to the maximum drift time of 2.3 ms.

Speaker: Mr Varuna Meddage (Kansas State University)

Slides copy_of_DPF.pdf

1:30 PM → 3:15 PM Neutrino Physics: Monday afternoon

Convener: Georgia Karagiorgi (Columbia University)

1:30 PM Summary of the Second Numu Disappearance Results from the NOvA Experiment

In light of the Nobel Prize awarded for neutrino oscillations in 2015, it is an exciting time to be a part of a long-baseline neutrino oscillation experiment. NOvA is one such experiment based out of Fermilab National Accelerator Laboratory, which uses two liquid scintillator detectors, one at Fermilab (the ``near" detector) and a second 14 kton detector in northern Minnesota (the ``far" detector.) The numu disappearance analysis is sensitive to the mixing parameters $\theta_{23}$ and $\Delta m^{2}_{32}$ and is capable of shedding light on the open question of whether or not $\theta_{23}$ is maximal. This talk will present the results from the second $\nu_{\mu}$ disappearance analysis using a full detector equivalent of $6.05 \times 10^{20}$ POT, which rejects the maximal mixing solution at 2.6$\sigma$.

Speaker: Dr Michael Baird (University of Virginia)

Slides nova_numu_SA_summary_DPF_2017-07-31.pdf

1:48 PM Muon Neutrino Dissapearance in the NOvA experiment

NOvA is a long-baseline neutrino oscillation experiment looking for muon neutrino disappearance and electron neutrino appearance. Having the longest baseline of any past or present accelerator experiment, NOvA uses the upgraded Neutrino Main Injector (NuMI) beam at Fermilab. The experiment measures oscillations within a muon neutrino beam using a 300 ton Near Detector and a 14 kiloton Far Detector placed 810 km away from each other, both located 14 milliradians off-axis. The energy spectra observed in this neutrino beam peaks at 2 GeV close to the oscillation maximum. NOvA being an oscillation experiment uses the Near Detector (ND) at Fermilab to measure the initial beam spectra and flavour composition. Then the spectra is extrapolated to the Far Detector (FD) at Ash River to search for oscillations. The NOvA Collaboration has updated its first analysis and has recently released a new $\nu_{\mu}$ disappearance result using an exposure of $6\times10^{20}$ protons-on-traget (POT). Our just-published result disfavours the symmetric mixing scenario ($\theta_{23}=\pi/4$) at 2.6 sigma significance, well beyond that of past results. By the end of February 2017, NOvA had been exposed to $9\times10^{20}$ POT for a $\nu_{\mu}$ beam which will allow us to better constrain the allowed regions for the oscillation parameters $\Delta m^2_{32}$ and sin$^2\theta_{23}$. Furthermore, the Disappearance Analysis Group has been pushing to increase its sensitivity, coming from a finner energy binning and hadronic energy fractions. These improvements are underway and waiting to be tested with real data once the reconstruction is done and ready by the beginning of Summer 2017. This talk will discuss the improvements to the muon neutrino disappearance analysis and how our sensitivity to non-maximal mixing can be improved.

Speaker: Ms Diana Patricia Mendez (University of Sussex)

Slides DPF2017_NuMuImprovements_DianaMendez.pdf

2:06 PM Recent Developments in T2K Oscillation Analysis

The T2K experiment is a long base-line neutrino experiment located in Japan. Having successfully discovered $\nu_{e}$ appearance from a $\nu_{\mu}$ beam, T2K is now aimed at probing CP violation in the lepton sector, the mass hierarchy, and the precision measurement of $\sin^2{\theta_{23}}$. Since data taking started in 2010, T2K has accumulated $14.7\times10^{20}$ protons on target (POT) in neutrino beam mode, and $7.6\times10^{20}$ POT in antineutrino beam mode. A new reconstruction algorithm for Super-Kamiokande (SK) -- the far detector of T2K -- is being used for event selection for the first time. The SK fiducial volume has been expanded,increasing the statistics by $\sim20\%$ from the previous selection with the same beam exposure. The latest developments in the T2K oscillation analysis within the PMNS framework, especially the measurement of $\delta_{CP}$, will be presented, and details of the analysis will be discussed.

Speaker: Ms Xiaoyue Li (Stony Brook University)

Slides t2k_oscillation_pdf.pdf

2:24 PM Using the PPFX package for the DUNE Experiment

PPFX for the Deep Underground Neutrino Experiment (DUNE) is a project that aims to improve the prediction of DUNE's flux and the estimation of hadron production uncertainties using hadron production data. Currently, the DUNE flux relies on GEANT4 based physics model which large uncertainties from hadronic interactions in the beamline. We used PPFX, a package developed by the MINERvA experiment at Fermilab to add improved hadronic interaction data to the GEANT4 based flux prediction. We use PPFX to study the predicted flux uncertainties for several candidate beamline designs. In this talk, I will discuss the process of applying the PPFX package to DUNE's flux and the resulting flux uncertainties.

Speaker: Amit Bashyal (Oregon State University)

Slides APS_DPF_017.pdf

2:42 PM Design of the LBNF Beamline

The Long Baseline Neutrino Facility (LBNF) will utilize a beamline located at Fermilab to provide and aim a neutrino beam of sufficient intensity and appropriate energy range toward DUNE detectors, placed deep underground at the Sanford Underground Research Facility (SURF) in South Dakota. The primary proton beam (60-120 GeV) will be extracted from the MI-10 section of Fermilab’s Main Injector. Neutrinos are produced after the protons hit a solid target and produce mesons which are subsequently focused by magnetic horns into a 194m long decay pipe where they decay into muons and neutrinos. The parameters of the facility were determined taking into account the physics goals, spacial and radiological constraints and the experience gained by operating the NuMI facility at Fermilab. The Beamline facility is designed for initial operation at a proton-beam power of 1.2 MW, with the capability to support an upgrade to about 2.4 MW. LBNF/DUNE obtained CD-1 approval in November 2015. We discuss here the design status and the associated challenges as well as the R&D and plans for improvements before baselining the facility.

Speaker: Jim Hylen (Fermi National Accelerator Laboratory)

Slides 2017-07-31_DPF_LBNF_beamline.pdf

3:00 PM Analytic Neutrino Oscillation Probabilities in Matter Revisited.

As we enter the precision measurement era for neutrino oscillation physics, it is imperative that our understanding of three flavor neutrino oscillations is also at comparable precision. Even in vacuum, three flavor oscillations is highly none trivial at a precision of 5% or better. Matter effects further complicate three flavor oscillation physics. Here, I will revisit the analytic description of three flavor neutrino oscillation physics as given in recent papers, and discuss their implications for the current generation of neutrino oscillation experiments, in particular T2K and NOvA, and follow up with the next generation of experiments DUNE, T2HKK, and JUNO.

Speaker: Dr Stephen Parke (Fermilab)

Slides parke_dpf.pdf

1:30 PM → 3:15 PM Particle Detectors: Monday afternoon

Convener: Ms Angela Fava (Fermilab)

1:30 PM Upgrade of the ATLAS Monitored Drift Tube Electronics for the HL-LHC

To cope with large amount of data and high event rate expected from the planned High-Luminosity LHC (HL-LHC) upgrade, the ATLAS monitored drift tube (MDT) readout electronics will be replaced. In addition, the MDT detector will be used at the first-level trigger to improve the muon transverse momentum resolution and reduce the trigger rate. A new trigger and readout system has been proposed. Prototypes for two frontend ASICs and a data transmission board have been designed and tested, detailed simulation of the trigger latency has been performed, and segment-finding and track fitting algorithms have been developed. We will present the overall design of the trigger and readout system and show latest results from various prototype studies

Speaker: Mr yu liang (University of Michigan)

Slides Upgrade_of_the_ATLAS_Monitored_Drift_Tube_Electronics_for_the_HL-LHC.pdf

1:45 PM Near-Infrared Scintillation of Liquid Argon

After briefly reviewing past attempts to observe and measure the scintillation of condensed noble gases in the near-infrared (NIR), we outline the prospects and advantages of using the NIR scintillation as the light signal in liquid argon time projection chambers. We conclude with preliminary results obtained at Fermilab's Proton Assembly Building cryogenic facilities.

Speaker: Carlos Escobar (Fermilab and UNICAMP)

Slides COEscobar-NIR_in_LAr.potx

2:00 PM Studies with the LArIAT Light Collection System

The detection of scintillation from particles in liquid argon time projection chambers (LArTPCs) serves a crucial role in triggering and interaction timing for liquid argon neutrino experiments, with potential to enhance calorimetry and particle identification efficiency as well. The LArIAT experiment provides an opportunity to explore new ideas for light collection in LArTPCs in a controlled test beam environment. Two cryogenic photomultiplier tubes (PMTs) and several varieties of silicon photomultipliers (SiPMs) mounted to custom preamplifier boards are suspended behind the LArIAT TPC's wireplanes. Reflective foils coated in tetraphenyl butadiene (TPB) line the field cage walls to down-shift scintillation vacuum-ultraviolet (VUV) photons into detectable visible light. In the most recent run, this configuration was changed to having a transparent cathode with TPB coated reflector foils mounted behind to more closely mimic proposed upcoming neutrino experiments. Additionally, a new light detection device (the ARAPUCA) was deployed for R&D studies. Analyses are underway which use this light to identify and study Michel electrons, improve particle identification, and enhance calorimetry of beam particles by combining light with total charge collected on the wireplanes.

Speaker: Ms Monica Nunes (UNICAMP)

Slides DPF_meeting_-_LArIAT_.pdf

2:15 PM Characterizing LArTPC detector performance with MicroBooNE

With many current and future neutrino experiments relying on Liquid Argon Time Projection Chamber (LArTPC) technology, characterizing the performance of these detectors is critical. The MicroBooNE LArTPC experiment is capable of performing numerous measurements to better understand the technology. These include identification and filtering of excess TPC noise, signal calibration and measurements of diffusion and recombination. MicroBooNE, residing on the surface, can also provide useful information about cosmic ray rate and the build up of space charge in the TPC volume. A laser calibration system has been designed and employed to investigate these important effects.

Speaker: Dr JYOTI JOSHI (Brookhaven National Laboratory)

Slides DPF_31July2017.pdf

2:30 PM Detector performance and cosmic-ray reconstruction efficiency in MicroBooNE

The MicroBooNE detector is a liquid argon time projection chamber at Fermilab designed for short-baseline neutrino oscillation physics and neutrino-argon interaction cross-section measurements. Due to its location near the surface, a good understanding of cosmic muons as a source of backgrounds is of fundamental importance for the experiment. This talk will show recent results on MicroBooNE detector performance from our first 18 months of running and a method to determine the cosmic-ray reconstruction efficiency using an external cosmic-ray counter, installed above the main detector. The analysis represents a small-scale demonstration of the method that can be used with future data coming from a recently installed cosmic-ray tagger system, which is able to tag ≈ 80% of the cosmic rays passing through the MicroBooNE detector.

Speaker: Mr Stefano Roberto Soleti (University of Oxford)

Slides dpf2017.pdf

2:45 PM protoDUNE-SP Cold Electronics Quality Control

The protoDUNE-SP detectors are large-scale prototypes of the single-phase Liquid Argon Time Projection Chamber (LArTPC) and cold electronics designs proposed for the Deep Underground Neutrino Experiment (DUNE). TPC wires will be instrumented by 15360 readout channels implemented with low noise shaping-amplifier and digitization ASICs integrated into Front End Motherboards (FEMBs) operating at cryogenic temperature within the cryostat. The large number of electronics channels and high performance specifications require a large-scale production electronics quality control effort including highly automated test methods under realistic cryogenic operating conditions. This talk will summarize the protoDUNE-SP cold electronics quality control plan, details of its implementation and preliminary results.

Speaker: Brian Kirby (Brookhaven National Lab)

Slides 20170731_DPF2017_coldElecProductionTesting.pdf

3:00 PM Development of fast timing detectors at Fermilab

Results of development of fast timing detectors at Fermilab presented. The detectors are based on different type of radiators (scintillators, quartz, crystals) and photodetectors (PMT, MCP-PMT, SiPMs) detecting the light converted in charge. Part of detectors based on silicon registration the charge produced by particle. Detectors are tested at FTBF. The obtained time resolution (TR) for some of detectors is less of 10 picoseconds. The results show the detectors could be used for CMS upgrade, HEP experiments and medical research.

Speaker: Dr Anatoly Ronzhin (Fermi National Accelerator Laboratory)

Slides 333AIR_DPF_Anat_2017.pdf 333AIR_DPF_Anat_2017.pptx

1:30 PM → 3:15 PM QCD: Monday afternoon

Convener: Radja Boughezal (Argonne National Laboratory)

1:30 PM NNLO QCD Predictions

In this talk, I will review the current status of NNLO QCD predictions at the LHC

Speaker: Dr Xiaohui Liu (Beijing Normal University)

Slides dpf2017.pdf

1:59 PM The spin-dependent quark beam function at NNLO

The question of how the nucleon’s spin is distributed among the partons is one of the important unsolved problems in physics and has recently received substantial attention from experimental measurements. In order to fully exploit these measurements an accurate theoretical description of the observables is required. The N-jettiness subtraction scheme provides a framework in which the desired accuracy can be achieved. In this talk I present the calculation of the beam function for longitudinally polarized quarks through next-to-next-to-leading order (NNLO) in QCD perturbation theory. This is the last missing ingredient needed to apply the factorization theorem for the N-jettiness event-shape variable in polarized collisions through the NNLO level. A special emphasis is given to the computational techniques, used to perform this computation and the treatment of the fifth gamma matrix in dimensional regularization. The NNLO polarized quark beam function is an essential ingredient for describing polarized collisions at NNLO precision. Therefore its knowledge is a big step towards extending the global fit of the polarized proton structure to the NNLO level.

Speaker: Ulrich Schubert (Argonne National Laboratory)

Slides Schubert_DPF.pdf

2:37 PM Analytic resummation of TMD distributions in momentum space in SCET_II.

We study the transverse momentum spectra of gauge bosons ( Z, $\gamma^*$, Higgs) in PP collisions in the regime of low transverse momentum. We also develop a scheme of resummation allowing us to choose the factorization scale for virtuality in momentum space which is then applied to obtain the transverse momentum spectra for the Drell-Yan and Higgs at NNLL accuracy. Using this scheme, we show, for the first time, how an analytic formula for these cross sections can be obtained at each order of resummation. Finally, a comparison with other resummation schemes is presented along with a discussion of possible non-perturbative effects.

Speaker: Dr Varun vaidya (lanl)

Slides DPF2017.pdf

2:56 PM Pion Polarizability at CERN COMPASS

The pion polarizability is of fundamental interest in the low-energy sector of quantum chromodynamics. It is directly linked to the quark-gluon substructure and dynamics of the pion, the lightest bound system of the strong interaction. COMPASS measured the electromagnetic polarizability of the charged pion, which describes the stiffness of the pion against deformation in strong electromagnetic fields. Previous low statistics experiments in Serpukhov (Russia), where the Primakoff method for realizing interactions of charged pions with quasi-real photons was first employed. Later, other measurements based on photon-nucleon and photon-photon collisions were also carried out at different laboratories. The COMPASS measurement demonstrates that the charged-pion polarizability is significantly smaller than previous results, roughly by a factor two, with the smallest uncertainties realized so far. The results are consistent with chiral perturbation theory predictions, and strength the identification of the pion with the Goldstone boson of the strong interaction. Strong interaction theory makes a precise prediction on the polarisability of pions – the degree to which their shape can be stretched. This polarizability has baffled scientists since the 1980s, when the first measurements appeared to be at odds with the theory. Today’s result is in close agreement with theory. The electric απ and magnetic βπ charged pion Compton polarizabilities provide stringent tests of Chiral Perturbation Theory. The combination (απ-βπ) was measured at CERN COMPASS via radiative pion Primakoff scattering (Bremsstrahlung of 190 GeV/c π-s) in the nuclear Coulomb field: π + Z → π + γ + Z. This reaction is identified experimentally by virtue of the very small momentum transfer to the target nucleus; and is equivalent to γ + π → γ + π Compton scattering for laboratory γ's of order 1 GeV/c incident on a target pion at rest. COMPASS data analysis (assuming απ+βπ=0 based on theory) gives a value απ = -βπ = 2.0 ± 0.6(stat) ± 0.7(syst) × 10-4 fm3. This is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes.This new measurement strengthens the identification of the pion with the Goldstone boson of strong interactions.

Speaker: Prof. Murray Moinester (Tel Aviv University)

Slides PipolDPF1.pdf

3:15 PM → 3:45 PM Break

3:45 PM → 5:30 PM Plenary: Monday afternoon

Convener: Prof. Priscilla Cushman (University of Minnesota)

slides dpf_proceedings_aug2017.pdf

3:45 PM WIMP dark matter searches progress and plans

Speaker: Prof. Rafael Lang (Purdue University)

Slides rafael_wimps.pdf rafael_wimps.pptx

4:20 PM Progress and new ideas in non-WIPM dark matter searches

Speaker: Kathryn Zurek (Berkeley Lab)

Slides 17_DPF.pdf

4:55 PM APS Fellows award ceremony

Speaker: Dr Marcela Carena (Fermilab)

5:40 PM → 5:50 PM Meeting Photo

Convener: Mr Reidar Hahn Hahn (Fermilab - Office of Communications - Visual Media Services)

6:00 PM → 8:00 PM Poster Session and Reception

6:00 PM Gamow penetration factor for nuclear fusion reaction in quantum plasmas

The quantum shielding effects on the nuclear fusion reaction process are investigated in quantum plasmas. The closed expression of the classical turning point for the Gamow penetration factor in quantum plasmas is obtained by the Lambert W-function. The closed expressions of the Gamow penetration factor and the cross section for the nuclear fusion reaction in quantum plasmas are obtained as functions of the plasmon energy and the relative kinetic energy by using the effective interaction potential with the WKB analysis. It is shown that the influence of quantum screening suppresses the Sommerfeld reaction factor. It is also shown that the Gamow penetration factor increases with an increase of the plasmon energy. It is also shown that the quantum shielding effect enhances the deuterium formation by the proton-proton reaction in quantum plasmas. In addition, it is found that the energy dependences on the reaction cross section and the Gamow penetration factor are more significant in high plasmon-energy domains.

Speaker: Prof. Young-Dae Jung (Hanyang University)

6:01 PM Investigation of Beam Emittance and Beam Transport Line Optics on Polarization

Effects of beam emittance, energy spread, optical parameters and magnet misalignment on beam polarization through particle transport systems are investigated. Particular emphasis will be placed on the beam lines being used at Fermilab for the development of the muon beam for the Muon g-2 experiment, including comparisons with the natural polarization resulting from pion decay, and comments on the development of systematic correlations among phase space variables. This work was supported by the National Science Foundation Grant 1623691.

Speaker: Mr Andrew Fiedler (Northern Illinois University)

6:02 PM Probing MeV Scale Physics in LArTPCs with Radioactive Calibration Sources

The Liquid Argon Time Projection chamber (LArTPC) is a unique technology well suited for large scale neutrino detectors. They allow for millimeter scale 3D precision particle tracking and calorimetry with good $\frac{dE}{dx} $ resolution, which provides excellent efficiency of particle identification and background rejection. While studies of detector response to high energy events have begun, there has been little to no direct demonstration of LArTPCs’ capabilities in producing ground breaking physics with solar and supernovae low­-energy neutrinos. We aim to facilitate the development of low­-energy LArTPC capabilities by developing the first 1­-10 MeV calibration subsystems for large LArTPCs. In this talk, I will introduce the properties of supernova neutrinos, discuss how they can be detected in LArTPCs, and overview the low-energy LArTPC calibration source conceptual designs we are developing.

Speaker: Jonathan Echevers (University of Illinois at Urbana-Champaign)

6:03 PM Testing data connections for use with the HL-LHC CMS forward pixel electronics

For the CMS HL-LHC upgrade, a new Inner Tracker will be installed consisting of silicon pixel detector layers in the central region and disks placed in the forward region. A new readout chip will be used along with gigabit optical data links. Proposed designs for the readout chain electronics include a mix of high bandwidth electronic transmission cables and optical links. Until the new custom readout chips are available, a Xilinx Virtex-7 FPGA chip and prototype card will provide functional emulation for studies of the readout chain presented here.

Speaker: Mario D. Balcazar (University of Kansas)

6:04 PM Real time trigger rate monitoring at CMS

Throughout Run II, the trigger rate monitoring tool used by CMS has helped identify problems throughout the detector, leading to faster diagnosis and correction thanks to real time monitoring and alarms. This tool also incorporates trigger rates into CMS data certification. An overview of this tool is presented.

Speaker: Charles Mueller (University of Notre Dame)

6:05 PM Shower reconstruction performance studies for DUNE far detector

Two of the flagship analyses at the DUNE far detector are to determine the neutrino mass hierarchy and to measure the CP violating phase, using the appearance of electron-neutrino signal events in the far detector. To efficiently select signal events, we require robust shower reconstruction tools to achieve the maximal electron/photon separation. We present a summary of existing shower reconstruction algorithms, and their efficiency and performance by calculating the shower purity and completeness, as well as the dE/dX distributions for electron and photon showers. We also explore possible areas of improvements for the electron shower reconstruction for better electron-neutrino signal reconstruction.

Speaker: Dr Reddy Pratap Gandrajula (Michigan State University)

6:06 PM The Cosmological Principle Breaks Down as Superstructures Grow in the Universe

Humanity's cosmic physics relies on the assumption that, "the Universe looks the same for all observers, regardless of location." This assumption is called the Cosmological Principle, which is defined by the properties of homogeneity and isotropy. Homogeneity states that, the Universe looks the same at each point, while isotropy states that the Universe looks the same in all directions. While it is known that the cosmological principle breaks down at smaller cosmic scales (e.g., clusters of galaxies and solar systems), most research suggests that it holds at larger scales where clusters of galaxies are simply dots on the cosmic landscape. However, we now know that galaxies are not randomly distributed throughout the Universe. Greater than 90% of galaxies are located in dense areas of dark matter, where dark matter has condensed to form a cosmic web across the Universe. This cosmic, dark matter web is not static, but is continuing to condense, with "branches" in the web merging to become thicker "superstructures" over time. These findings suggest that the Cosmological Principle will eventually break down at all scales. The questions, then, are (1) at what scale does the Cosmological Principle fail now and (2) when will the largest scales of the Universe look like this current, "failed" scale? Using a database from The Max Planck Institute for Astrophysics, the distribution of dark matter hot spots was tested for significant deviations from random at different scales. Then, the database was used to estimate the growth rate of dark matter superstructures. These data were then combined to find that the Cosmological Principle will fail, at all scales, in another 54.7 billion years (a 68.4 billion-year-old Universe). Given that life could exist in the Universe for another 120 trillion years, the Cosmological Principle appears to be a fleeting characteristic of the infant Universe.

Speaker: Mr Cameron Marshall (Manhattan High School & Kansas State University)

6:07 PM New fermionic dark matters, extended standard model and cosmic rays

Three generations of leptons and quarks correspond to the lepton charges (LC) in the present work. Then, the leptons have the electric charges (EC) and lepton charges (LC). The quarks have the EC, LC and color charges (CC). Three heavy leptons and three heavy quarks are introduced to make the missing third flavor of EC. Then the three new particles which have the electric charges (EC) are proposed as the bastons (dark matters) with the rest masses of 26.121 eV/c2, 42.7 GeV/c2 and 1.9 1015 eV/c2. The RK anomaly is discussed here. And these new particles are applied to explain the origins of the astrophysical observations like the ultra-high energy cosmic rays and super-nova 1987A anti neutrino data. It is concluded that the 3.5 keV x ray peak observed from the cosmic x-ray background spectra is originated not from the pair annihilations of the dark matters but from the x-ray emission of the Q1 baryon atoms which are similar in the atomic structure to the hydrogen atom. New particles can be indirectly seen from the astrophysical observations like the cosmic ray and cosmic gamma ray [1,2]. [1] https://www.researchgate.net/publication/314877019 . [2] https://www.researchgate.net/publication/314246000 .

Speaker: Dr Jae-Kwang Hwang (JJJ Physics Laboratory)

6:08 PM CMS Pixel Detector Upgrade for HL-HLC

To meet the experimental challenges and reach the physics potential of the High Luminosity LHC (HL-LHC), the CMS experiment will be replacing its current pixel detector with new technology and designs. The upgrade plan includes extending the inner pixel detector in the forward region from the current coverage of |\eta|<2.4 to 4, and adopting small-pitch pixel sensors and next-generation electronic read-out. This talk reviews the objective and status of the pixel detector upgrade. Studies in simulation, from design optimization, detector modeling, and performance estimation, will be the focus of this talk. Finally, potential physics benefits from the upgrade are discussed.

Speaker: Yangyang Cheng (Cornell University)

6:10 PM Reaching Out for Particle Physics

The International Particle Physics Outreach Group (IPPOG) is a global network of physicists and educators committed to promote the particle physics research in the community through informal education and outreach. Following the model of experimental particle physics collaborations, IPPOG itself has become a scientific collaboration based on a memorandum of understanding. We describe the collaboration and its work to share ideas and best practices for reaching both scientist enthusiasts and audiences new to science.

Speaker: Marjorie Bardeen (FNAL)

6:11 PM A Flux Spectrometer for LBNF/DUNE

The Long-Baseline Neutrino Facility (LBNF) will include a conventional neutrino beam made by colliding a high energy proton beam with a fixed target, focusing the resulting hadron using a set of magnetic horns and allowing them to decay to neutrinos. As with most conventional neutrino beams, uncertainties on the number of neutrinos in the beam as a function of energy are of order 10%. The Flux Spectrometer is a proposal to measure the LBNF hadron flux after the focusing horns and before the decay volume, substantially reducing uncertainties in the neutrino flux. Recent work on the Spectrometer, including potential locations, possible designs and preliminary simulations, will be presented.

Speaker: Laura Fields (Fermilab)

6:12 PM Performance Studies of Capacitively Coupled HVCMOS Pixel Sensors Before and After Gamma Irradiation

High voltage CMOS pixel sensors are a promising technology that is being considered for particle physics detectors such as the ATLAS Inner Tracker due to their potential to realize a fully monolithic design at considerable cost savings while not compromising on high track reconstruction efficiency, charge collection, and radiation hardness. HVCMOS sensors have circuitry built into each pixel cell that amplifies the signal from the collected charge increasing it enough where it can be read-out via capacitive coupling by a traditional front-end read-out chip. In the case of a fully monolithic sensor, the on-pixel circuitry includes discrimination and digitization. The H35DEMO is a prototype pixel sensor built using 350 nm technology that demonstrates multiple examples of HVCMOS technology including several amplification and digitization matrices. The radiation tolerance of the analog matrices was assessed using test beam data to measure the impact on track reconstruction performance after gamma irradiation.

Speaker: Dylan Frizzell (University of Oklahoma)

6:13 PM The Low Background Laboratory at Idaho State University

The Deep Underground Neutrino Experiment (DUNE) hopes to study in great detail atmospheric, solar and supernova neutrino events. In order to do so, the background radiation at both the near detector (at Fermilab) and the far detector (at the Sanford research facility in South Dakota) must be understood in great detail. The Low Background Laboratory (LBL) is to be built at Idaho State University (ISU) to understand this background radiation and will be used to control the radio-purity of materials used in the construction of both of the DUNE detectors. The goal of the proposed LBL is to provide a tool to identify the most practical and radiologically clean materials to be used by DUNE and to model the background radiation to be expected in the DUNE detectors over the next 20 years. The cosmic ray background at 4850 feet depth will be relatively small. The background from naturally occurring radioactive isotopes however, is expected to be substantial. Just one of the radioactive isotopes in the detector, i.e. 39Ar, is expected to produce a 20KHz background signal, which will severely degrade the detector performance at low energy. Other natural radioactive isotopes, e.g. 40K, 220Rn and 222Rn and the other isotopes from the Uranium and Thorium decay chains, are expected to produce comparable, or higher backgrounds. The LBL will allow us to substantially reduce those radiological backgrounds which we can control by allowing us to select construction materials not only for their performance, but also for their radiological purity. In order to measure as accurately as possible the radiological purity of construction materials, the LBL will reduce the Radon related background by an expected 90% by placing the entire detector system in a class 10000 clean room with autonomous HVAC system, HEPA filters, and the ability to maintain overpressure. The combination of passive and active shielding will substantially reduce the background. We will estimate the background reduction factor with Monte Carlo simulations and in situ measurements. Finally, the LBL will model the background radiation to be expected at both the near and far detectors using GEANT4 on the College of Science and Engineering’s Minerve cluster.

Speaker: Mr P James Norris (Idaho State University)

6:14 PM Search for Dark Interactions with the ATLAS experiment

Hidden sector or dark sector states appear in many extensions to the Standard Model, to provide a candidate for the dark matter in the universe or to explain astrophysical observations of positron excesses. A hidden or dark sector can be introduced with an additional U(1)d dark gauge symmetry. The presence of the dark sector could be inferred either from deviations from the SM-predicted rates of Drell-Yan (DY) events or from Higgs boson decays through exotic intermediate states. The discovery of the Higgs boson during Run 1 of the Large Hadron Collider opens a new and rich experimental program that includes the search for exotic decays H —> Z Zdark —> 4l and. H —> Zdark Zdark ->4l, where Zdark is a dark vector boson. In this talk, we will review the status of current searches for dark sector states with the ATLAS detector and the prospects for LHC Run 2.

Speaker: Dr Ketevi Adikle Assamagan (Brookhaven National Laboratory)

6:15 PM Measurement of PTFE Reflectance for Xenon Scintillation Light

The LUX-ZEPLIN (LZ) experiment is a next-generation direct detection experiment under construction to search for dark matter. The detector contains a dual-phase liquid xenon (LXe) time projection chamber with a total active mass of 7 tons and is located at the Sanford Underground Research Facility (SURF) in South Dakota. LZ takes advantage of the high VUV reflectivity of PTFE to achieve high light collection efficiency. Previous work has shown that thinner PTFE layers may reduce radiological backgrounds, and thus these are preferred so long as no significant loss in reflectance results. In this presentation, experimental results of the reflectance near wavelengths of 178 nm of thin PTFE, Kapton, and PEEK sheets immersed in LXe, conducted with the Michigan Xenon Detector (MiX), will be discussed.  It is further planned to compare those measurements with light propagation simulations to estimate the absolute reflectance of these materials.

Speaker: Yuhan Wang (University of Michigan)

0 Yuhan-DPF-2017-poster-final.pdf

6:16 PM Muon Intensity Increase by Wedge Absorbers

Low energy muon experiments such as mu2e and g-2 have a limited energy spread acceptance. Following techniques developed in muon cooling studies and the MICE experiment, the number of muons within the desired energy spread can be increased by the matched use of wedge absorbers. More generally, the phase space of muon beams can be manipulated by absorbers in beam transport lines. Applications with simulation results are presented.

Speaker: Dr David Neuffer (Fermilab)

6:17 PM Testing, Installation, Integration and Performance Studies of a Cosmic Ray Tagging System for the Short Baseline Neutrino Program Far Detector (ICARUS)

The ICARUS T600 liquid argon time-projection chamber will be the far detector for the Short Baseline Neutrino Program. The detector will operate at shallow depth and therefore be exposed to the full surface flux of cosmic rays. Application of overburden attenuates most of this background expected for muons. However, the remaining background is problematic since a photon produced by a muon passing in close proximity to the T600 active volume can be mistaken for a neutrino event. In principle, a large fraction of these events can be removed from the data through application of selection cuts as suggested by Monte Carlo studies. However, this method of background rejection reduces fiducial target mass and renders analysis of the systematics difficult. A straightforward way to remove the cosmic muon background more thoroughly is to utilize a detector external to the liquid argon active volume capable of tagging thoroughgoing cosmic muons with high efficiency (e.g. > 95%). Ideally, this external cosmic ray tagger (CRT) would provide full geometric coverage of the T600. During the past 18 months at Colorado State University (CSU), we performed Monte Carlo studies of the tagging efficiencies of the system and conducted an extensive research and development program of such a system based on extruded organic scintillator, wavelength-shifting fibers, and silicon photomultipliers. Subsequently, it was decided that our European colleagues would design and construct the top portion of the CRT while the US groups would provide the side (~400 m^2) and bottom (~215 m^2) portions using salvaged MINOS veto shield modules on the sides and Double Chooz veto modules on the bottom. These two systems will need to be tested for basic functionality and to have their detailed response characterized in order to optimize the system configuration as well as prepare for future analysis tasks and integration with the other detector sub-systems.

Speaker: Mr Christopher Hilgenberg (Colorado State University)

6:18 PM LBNF Optimized Horn Design & Target Integration

Optimization efforts for the Long Baseline Neutrino Facility (LBNF) have been pursued as an opportunity to further expand the reach of the experiment in the energy spectrum, and to significantly increase neutrino flux to the detectors. Major improvements and subsequent reconfigurations have been completed to the horn focusing system, in addition to the target, achieving the goals set forth. The optimized design is proposed as a three-horn system, with the graphite target now integrally supported within the primary horn, Horn A. Secondary and tertiary horns have been enlarged to increase pion gathering and maximize the potential of the near site facilities. Preliminary thermal and structural analysis for critical components will be presented, in conjunction with conceptual target layout and overall system operation.

Speaker: Mr Cory Crowley (Fermi National Accelerator Lab)

6:19 PM A Minimal non-universal EW extension of the Standard Model: A chiral family of models

We report the most general expression for the chiral charges of a non-universal U(1)' with identical charges for the first two families but different charges for the third one. The model is minimal in the sense that only standard model fermions plus right-handed neutrinos are required. By imposing anomaly cancellation and constraints coming from Yukawa couplings we obtain two different solutions. In one of these solutions, the anomalies cancel between fermions in different families. These solutions depend on four independent parameters which result very useful for model building. We build different benchmark models in order to show the flexibility of the parameterization. We also report LHC and low energy constraints for these benchmark models.

Speaker: Dr Richard Benavides (Instituto Tecnológico Metropolitano)

6:20 PM The Mu2e Solenoid Cold Mass Position Monitor System

The Mu2e experiment at Fermilab is designed to search for charged-lepton flavor violation by looking for muon to electron conversions in the field of the nucleus. The concept of the experiment is to generate a low momentum muon beam, stopping the muons in a target and measuring the momentum of the conversion electrons. The implementation of this approach utilizes a complex magnetic field composed of graded solenoidal and toroidal fields. The location of the solenoid cold mass relative to external fiducials are needed for alignment as well as monitoring coil movements during cool down and magnet excitation. This paper describes a novel design of a Cold Mass Position Monitor System that will be implemented for the Mu2e experiment.

Speaker: Dr Thomas Strauss (FNAL)

6:21 PM A Study of Mass Matrices with Permutational Symmetry for Quark Families

A set of 3x3 mass matrices are identified that have eigenstates that are mathematically equivalent to conventional QCD color states, and which have mass eigenvalues equal to the three quark flavor masses, for each of the two quark families. When integrated into the Dirac equations for each family, one obtains a theory that satisfies, TCP, Lorentz, U(1), and SU(2)L transformations, as well as parity and charge conjugation. With this approach, one obtains 3 degenerate mass eigenstates per color and flavor, which permits a unique and accurate fit of the CKM matrix, and a physical rationale is provided. SU(3) is not automatically satisfied for the mass terms in this theory. This is addressed by using an SU(3) Higgs mechanism, which is complementary with SU(2)L in creating mass in this theory for quarks.

Speaker: Richard Holmes (Boeing Company)

6:22 PM Search for vector-like quarks in fully hadronic final states with the ATLAS detector

This poster is presenting a search for pair produced vector-like quarks decaying in to a fully hadronic final state using 36.1 fb−1 of pp collisions with a center of mass energy of 13 TeV collected by the ATLAS experiment. We consider the decays of pair produced T and B vector-like quarks in to third generation standard model quarks with Higgs boson and gauge bosons W and Z. The analysis uses the variable radius re-clustering algorithm to reconstruct the large-radius jets and a multi-class deep neural network is used to tag the jets as hadronically-decaying top quarks, Higgs bosons, W bosons or Z bosons.

Speaker: Mr Madhuranga Thilakasiri Madugoda Ralalage Don (Oklahoma State University)

6:23 PM CosmicWatch: the Desktop Muon Detector

The CosmicWatch Desktop Muon Detectors were designed as an outreach tool to promote particle physics to undergraduates and high-school students. The detectors are pocket-sized, self-contained, light-weight (~100g), and require a very small amount of power (sub-Watt). The data can be read-out through a USB serial connection or saved locally to an SD-card. We've been working with students at various universities and high-schools through-out the world and have found that a single detector can be built by a new student in under a few hours for approximately $100.

Speaker: Spencer Axani (MIT)

6:24 PM The formalization of the relation between wave and particle and the unifying of three kinds of wave-particle duality

After Jihua Gan’s solution for contradiction of separation and continence between classical physics and quantum theory, the contradiction of particle and wave consequentially has new solution. Based on the advance of Dirac's work in 1927, from "mode decomposition of classical electromagnetic field" to "photon decomposition of classical electromagnetic field”, a corresponding relation of basic units between classical electromagnetic field and quantum electromagnetic field is established, and a new wave-particle duality which is the third kind of wave-particle duality is revealed. It indicates that classical electromagnetic field has particle features in structure, which can be formed by superposition of a series of electromagnetic element-waves. Further more, energy and momentum of each electromagnetic element-wave can be equal to the energy and momentum of a photon in the same frequency. Later, three kinds of wave-particle duality, Einstein’s Wave-particle duality of light in 1905, de Broglie’s Wave-particle duality of particle in 1923, and Gan’s Wave-particle duality of wave in 1994, are compared. A relation of π-type structure among them is presented, and the π-type triple wave-particle duality of micro-object is revealed. Finally, after mathematical abstraction and physical generalization of π-type triple wave-particle duality, not only formulation of relation between wave and particle is accomplished but also the deep arcanum behind electromagnetic waves and photons is betrayed. It is just Tai Chi photon-wave and electromagnetic wave and photon are but two different showing forms of Tai Chi photon-wave under proper condition.

Speaker: Mr Yongchao Gan (Faculty of Physics & Electronic Science, Hubei University)

6:25 PM Background estimation for the electron neutrino appearance analysis in NOvA

The NOvA experiment is an off-axis, two-detector experiment designed to study electron neutrino ($\nu_e$) appearance in the NuMI beam from Fermilab. The 300-ton Near Detector is 1 km from the target, and allows the study of the neutrino beam spectrum and composition before oscillations, while the larger (14,000 ton) Far Detector, situated on the surface 810 km away, observes the oscillated beam. The main backgrounds to $\nu_e$ appearance in the Far Detector arise from the intrinsic beam-$\nu_e$ contamination, and mis-classified neutral current and muon neutrino charged current interactions. This poster describes the techniques we use to predict such beam-induced backgrounds in the NOvA Far Detector based on the observed Near Detector data.

Speaker: Erika Catano Mur (Iowa State University)

Poster DPF2017_poster_NOvA_nue_ecatanom.pdf

6:26 PM Design of a Nitrogen Cooled Target Shield Pile for the LBNF Beamline

The Long Baseline Neutrino Facility (LBNF) will utilize a beamline at Fermilab to produce a neutrino beam aimed at the Sanford Underground Research Facility in South Dakota. A primary proton beam will interact with a target to produce mesons, which will be focused by magnetic horns before decaying into neutrinos. The target and horns are contained in a chamber, which is surrounded by a shield pile made of steel, concrete, marble, and borated high-density polyethylene to protect workers and surrounding groundwater from irradiation. The shielding is cooled by nitrogen gas which is pumped through the entirety of the chamber. The nitrogen also prevents corrosion and the production of unwanted radioactive isotopes. The chamber is kept at a positive pressure to prevent the infiltration of air into the chamber. The sealing system of the chamber is composed of a leak-tight stainless steel barrier around the target chamber, a modular hatch cover system to allow access to the chamber for maintenance, sealed feedthroughs which allow cooling water, power, and instrumentation to reach the target and horns inside, and a fill/purge system. The shielding closest to the beamline components is also cooled using water-cooled panels. We discuss here the current design of the shield pile, and the cooling and sealing systems which support it, as well as the expected challenges and plans for improvement.

Speaker: Joseph Angelo (Fermi National Accelerator Laboratory)

6:27 PM Looking at BNB Neutrinos in the NOvA Near Detector

The NOvA Near Detector (ND) is a 300-ton, fine-grained, nearly fully active low-Z tracking calorimeter located at Fermilab, located 1 km from the NuMI beam target. The unique positioning of the ND also results in an exposure to Booster Neutrino Beam (BNB) neutrinos at 162 mrad off-axis, 780 m away from the target with a kaon-induced neutrino energy peak around 1.4 GeV and a pion-induced energy peak around 400 MeV. With an estimated 2500 νμ true charged-current interactions from the BNB per year, there are enough data to perform a pion/kaon production ratio measurement, with an opportunity to augment the NOvA ND energy scale and add to the understanding of neutrino cross-sections in the 1-2 GeV region in the future. This analysis implements new algorithms to identify and reconstruct low energy events by using visual deep learning tools such as convolutional neural networks. This poster discusses the current status of the analysis.

Speaker: Ryan Murphy (Indiana University)

6:28 PM Tracking Detector Performance and Data Quality in the NOvA Experiment

NOvA is a long-baseline neutrino oscillation experiment. It uses the NuMI beam from Fermilab and two sampling calorimeter detectors located off-axis from the beam. The NOvA experiment measures the rate of electron-neutrino appearance in the almost pure muon-neutrino NuMI beam, with the data measured at the Near Detector being used to accurately determine the expected rate at the Far Detector. It is very important to have automated and accurate monitoring of the data recorded by the detectors so any hardware, DAQ or beam issues arising in the 344k (20k) channels of the Far (Near) detector which could effect quality of the data taking are determined. This poster will cover the techniques and detector monitoring systems in various stages of data taking.

Speaker: Mr Biswaranjan Behera (IIT Hyderabad/Fermilab)

6:29 PM Prospects for Neutron-Antineutron Oscillation Searches with Convolutional Neural Networks in Liquid Argon Time Projection Chambers

Future, large-scale liquid argon time projection chamber (LArTPC) detectors provide a unique opportunity to search for neutron-antineutron oscillation. This is a rare, baryon-number-violating signature predicted only by theories beyond the Standard Model. This talk will present a convolutional neural network approach that can be used to search for neutron-antineutron oscillation events in the future Deep Underground Neutrino Experiment (DUNE). The network performance will be presented, along with preliminary sensitivity results.

Speaker: Georgia Karagiorgi (Columbia University)

Slides DPF_poster_nnbar.pdf

6:31 PM Particle Identification and Kaon Physics in LArIAT

Kaon physics in liquid argon time projection chambers (LArTPCs) is important for future proton decay searches in large-scale LArTPCs, such as DUNE. Using LArIAT, a LArTPC test beam experiment at Fermilab, we have selected—with traditional beam line instrumentation—around 3E3 kaon candidate events, creating the first kaon data sample in a LArTPC. This sample allows us to perform the first studies of kaons in this detector, including the kaon total cross section on argon, automatic reconstruction performance of kaon topologies, and LArTPC-based kaon identification efficiencies. Further, we explore ways to improve this LArTPC-based particle identification through the use of data-driven machine learning techniques, work beneficial to all future automatic LArTPC reconstruction.

Speaker: Mr Daniel Smith (Boston University)

6:32 PM Measuring the $t\bar{t}$ Forward-Backward Asymmetry using semi-leptonic final states at 8 TeV with the CMS detector

We presents a measurement of Forward-Backward Asymmetry($\displaystyle{A_{FB}}$) in $t\bar{t}$ production. The data sample corresponds to $19.7\,\textrm{fb}^{-1}$ of integrated luminosity in proton-proton collisions at $\sqrt{s} = 8\,\textrm{TeV}$ collected by the CMS experiment at the LHC. Events selected contain a single isolated muon or electron, with four or five jets of which two are b-tagged. A template technique is used to extract the asymmetry from the top quark kinematic distributions. This technique is based upon an extension of the tree-level cross section for $q\bar{q}$ initial states that sensitively isolates $q\bar{q}$ from $gg/qg$ initial states. The measured $A_{FB}$ and relative aboundance of $q\bar{q}$ initiated $t\bar{t}$ will be reported and compared to both theoretical calculation and results from D0 and CDF experiments of Tevatron.

Speaker: lei feng (Johns Hopkins University)

6:34 PM Search for a large muon neutrino magnetic moment in the NOvA Near Detector

Various scenarios of beyond the Standard Model physics predict Majorana neutrinos with large magnetic moments. NOvA is well suited for such searches since its detectors are optimized for efficient electron detection and its Near Detector (ND) is exposed to an intense neutrino flux from the NuMI neutrino beam at Fermilab. This facilitates the accumulation of significant statistics for studying muon-neutrino-electron elastic scattering in the ND. A deep learning neural network for particle identification training is used to distinguish scattered electrons from neutral pion induced electromagnetic showers and the charged current background. We present an overview of this technique and the sensitivity on the search for a muon neutrino magnetic moment.

Speaker: Mr Biao Wang (Southern Methodist University)

6:35 PM Probing new physics scale through dimension-6 operator and enhanced $t\bar{t}h$ and $hh$ production at the LHC

No matter what the scale new physics is, deviations from the Standard Model for the Higgs observables will indicate the existence of such a scale. We consider effective six dimensional operators, and their effects on the Higgs productions and decays to estimate this new scale. Large uncertainties with the SM predictions still remains in some of the observables of these measurements. This encourages us to venture if there is a new physics scale that might be estimated from the uncertainty in these measurements, as well as if we can make make predictions which can be tested in the LHC. With this aim in mind, we consider the effect of a selected set of dimension six operators along with the SM. The dimension six operators related to Higgs physics can be introduced both in the strong sector, as well as in the electroweak sector. Such operators will make extra contributions for the Higgs productions, as well as for its various decay modes. In the most general case, for the effective dimension six operators, there are many operators, and involve large number of parameters. In order to reduce the number of parameters, we only consider a selected set of such operators in the gauge sector (both strong and electroweak (EW), as well as the Yukawa sector, which are responsible for larger effects, and do not affect the constraints from the EW precision tests in a significant way. Given the large uncertainties in the Higgs Productions and decays, we find that this scale can be as low as 500 GeV. We then calculate the $t\bar{t}h$ ̄productions , as well as double Higgs using the effective couplings at the Large Hadron Collider, and show these can be much different than those predicted by the Standard Model, for an wide region of these parameters space. These predictions can be tested in the current or the future runs of the LHC.

Speaker: SUDIP JANA (OKLAHOMA STATE UNIVERSITY)

6:36 PM An overview of the ANNIE experiment at Fermilab

The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is located at SciBooNE Hall along the Booster Neutrino Beam at Fermilab. It consists of a 23-ton water Cherenkov detector loaded with gadolinium, muon range detector and a veto wall. The main goal of the experiment is to measure the final state neutron multiplicity from charged current neutrino-nucleus interactions within the gadolinium-loaded water. Currently, ANNIE is running in Phase-I and it will be upgraded to Phase-II in the summer, by installing Large Area Picosecond Photodetectors (LAPPDs) in the detector. LAPPDs are a novel photodetector technology with single photoelectron time resolutions less than 100 picoseconds, and spatial imaging capabilities to within a single centimeter. They will play a crucial role to separate events of charged-current quasi-elastic (CCQE) interactions and inelastic multi-track charged current interactions. In this talk, we discuss the current status and future plans of the experiment.

Speaker: Dr Emrah Tiras (Iowa State University)

6:37 PM The NOvA Data Driven Trigger

The NOvA experiment is a long-baseline neutrino experiment utilizing an intense off-axis neutrino beam and two segmented liquid-scintillator-based detectors, a 300t near detector and a 14kt far detector located 810 km from the beam source. The NOvA experiment employs a data-driven trigger system to fully exploit the detectors during non-beam operation. We will present an overview of the NOvA trigger design and implementation, as well as data-driven trigger algorithms currently being used for calibration and a non-beam physics program.

Speaker: Matthew Judah (Colorado State University)

6:38 PM A Panel Prototype for the Mu2e Straw Tube Tracker at Fermilab

The Mu2e experiment will search for coherent, neutrino-less conversion of muons into electrons in the Coulomb field of an aluminum nucleus with a sensitivity of four orders of magnitude better than previous experiments. The signature of this process is an electron with energy nearly equal to the muon mass. Mu2e relies on a precision (~0.1%) measurement of the outgoing electron momentum to separate signal from background. In order to achieve this goal, Mu2e has chosen a very low-mass straw tracker, made of about 20,000 5 mm diameter thin-walled (15 μm) Mylar® straws, held under tension to avoid the need for supports within the active volume, and arranged in an approximately 3 m long by 0.7 m radius cylinder, operated in vacuum and a 1 T magnetic field. Groups of 96 straws are assembled into modules, called panels. We present the prototype and the assembly procedure for a Mu2e tracker panel built at Fermilab.

Speaker: Alessandra Lucà (FERMILAB)

6:39 PM LAr Scintillation Light Detection, Simulation and Analysis in LArIAT

LArIAT is a Liquid Argon Time Projection Chamber (LArTPC) installed in a charged particle beam at the Fermilab Test Beam Facility. This experiment, currently in its third run of data taking, is exploring the response of LAr at particle energies relevant for neutrino experiments. It also serves as a platform to prepare and benchmark the simulation, analysis and reconstruction software, used in LAr neutrino experiments. One of LArIAT's R&D goals is to develop readout methods for scintillation light in LArTPCs. The scintillation light detection system consists of Photomultipliers and Silicon Photomultipliers combined with wavelength-shifter covered reflector foils to enhance the detection efficiency and increase uniformity. This poster will present the methods of using scintillation light in LArTPCs to evaluate detector performance, PID and calorimetry and their results in LArIAT.

Speaker: Pawel Kryczynski (IFJ PAN, Krakow)

6:40 PM NNLO QCD Predictions of W and Z Bosons in proton-proton collisions at 7, 8, 13, 14 and 100 TeV Center of Mass Energies

Large Hadron Collider has run at 7, 8, 13 TeV but it is expected and planned to collect data at 14 TeV center of mass energy in 2019. Meanwhile, a 100 TeV hadron collider, called Future Circular Collider (FCC), is proposed to be built as a post-LHC particle accelerator. Therefore, we estimated W and Z boson cross sections and their uncertainties at LO, NLO and NNLO QCD using different most modern PDF models to understand the effect of the energy increase from 7 to 100 TeV. The predictions are computed using publicly available parton level Monte Carlo program DYnnlo1.5 and FEWZ 3.1. PDF, strong coupling constant, scale, model and parameterization uncertainties are considered and their size changes by energy increase are investigated.

Speaker: Dr Emrah Tiras (Iowa State University)

6:41 PM NOvA Short-Baseline Tau Neutrino Appearance Search

Standard three-flavor neutrino oscillations have well explained by a wide range of neutrino experiments. However the anomalous results, such as electron-antineutrino excess seen by LSND and MiniBooNE do not fit the three-flavor paradigm. This can be explained by an additional fourth flavor sterile neutrino at a larger scale than the existing three flavor neutrinos. The NOvA experiment consists of two finely segmented, liquid scintillator detectors operating 14 .6 mrad off-axis from the NuMI muon-neutrino beam. The Near Detector is located on the Fermilab campus, 1 km from the NuMI target, while the Far Detector is located at Ash River, MN, 810 km from the NuMI target. The NOvA experiment is primarily designed to measure electron-neutrino appearance at the Far Detector using the Near Detector to control systematic uncertainties; however, the Near Detector is well suited for searching for anomalous short-baseline oscillations. This poster will present a novel method for selecting tau neutrino interactions with high purity at the Near Detector using a convolutional neural network. Using this method, the sensitivity to anomalous short-baseline tau-neutrino appearance due to sterile neutrino oscillations will be presented.

Speaker: Mr Rijeesh Keloth (Cochin University of Science and Technology)

6:42 PM Calibration of gBlocks using Offline Jets for the gFEX Subsystem of the ATLAS Level 1 Calorimeter Trigger

The Global Feature Extractor (gFEX) subsystem of the ATLAS Level 1 calorimeter trigger will identify large-radius jets, which are typical of Lorentz-boosted objects. Here I present results from calibrating gBlocks, groups of towers, using offline R=0.4 jets. Dijet Monte Carlo simulation samples at a center of mass energy of 13 TeV are used to find calibration factors. Effects on energy resolution are studied as well.

Speaker: Ian Snyder (University of Oregon)

6:43 PM Cross Section Predictions of W/Z + Jets at LHC

Cross section predictions of W and Z bosons in association with jets (up to 6 jets) are presented using Alpgen MC generator with CTEQ6L1, a leading order parton distribution function (PDF). This study has been performed at center of mass energies of √s= 7, 8, 13, 14 TeV. To validate the results, a detailed comparison of cross section predictions is performed with the measured results by CMS and ATLAS collaborations. In addition, NLO QCD predictions are performed up to 2 jets using MCFM-8.0 MC generator.

Speaker: Dr Emrah Tiras (Iowa State University)

6:44 PM Skimming tau neutrinos and tau showers in the atmosphere

A technique to detect an astrophysical or cosmic high energy tau neutrino flux involves using the Earth as a neutrino converter. Taus produced near enough to the surface of the Earth can emerge and decay to produce atmospheric showers. The neutrino cross section, energy transfer to the tau, and tau energy loss via electromagnetic interactions will be discussed with applications to surface- and satellite-based detectors. The sensitivity of event rates to calculational approaches to the electromagnetic structure functions will be emphasized.

Speaker: Prof. Mary Hall Reno (University of Iowa)

6:45 PM Design, construction and characterization of a three channel of cosmic ray detector

Cosmic rays are particles generated by astrophysical sources, which currently are studied for their physical properties. Cosmic rays research can be used to improve technology, for instance, spectroscopy for material identification. A three-channel detector was built using three photo-multipliers, two scintillation plastic and several common materials, water, air, oil, aluminum, and others, to scan. They were allocated in vertical position, where material to scan channel is between scintillation plastics channels in order to validate the signal and study the interaction of cosmic rays with the different materials. Details of characterization, operation and some preliminary physical results are reported.

Speaker: Mr Oscar Eduardo Moreno Palacios (Universidad de Guanajuato)

6:46 PM Towards a new approach to cosmology with the Dark Energy Survey and Gravitational Waves

Motivated by the exciting prospect of new wealth of information that will arise from observations of gravitational and electromagnetic radiation from the same astrophysical phenomena, we have established a program to search for optical counterparts to LIGO/Virgo events using the the Dark Energy Camera (DECam). The project is performed in a broad collaboration including members of the Dark Energy Survey (DES) Collaboration, the LIGO/Virgo Collaboration, and the community at large. Its success has motivated us to pursue a new survey with DECam: the Blanco Images of the Southern Sky (BLISS) survey. BLISS expands the DECam sky coverage beyond the areas covered by DES and will increase the efficiency of our searches. In this talk, I present an overview of this effort, including results of searches for signatures of the first two binary black hole mergers detected by LIGO in the 2015-2016 observing campaign and status of the ongoing 2016-2017 campaign. I will also discuss plans for upcoming seasons and long term prospects for this exciting emerging field: multi-messenger cosmology with gravitational waves and optical data.

Speaker: Dr Marcelle Soares-Santos (Fermilab)

6:47 PM DES & Planck survey: Galaxy group-tSZ cross correlation

Stacking Sunyaev-Zeldovich map of groups and clusters is powerful tool to find average distribution of hot gas in these systems. The goals of this work are to estimate the redshift evolution of SZ signal and average bias weighted electron pressure of the universe. We stack SZ signal from Planck at all the detected redmapper groups from year 1 Dark Energy Survey data. We use groups at different redshift and mass to find the average pressure profile of these systems. We show that the detected signal can be modeled by a halo model using Battaglia pressure profile. After the modeling we show that there is an evolution in the pressure profile in the groups and we estimate the average thermal energy of the universe.

Speaker: Vinu Vikraman (Argonne National Lab)

6:48 PM Photometric Properties and Stellar Masses in Dark Energy Survey Galaxy Clusters

We present the results of a study of the properties of clusters, selected using the RedMaPPer technique, from the Dark Energy Survey Year 1 data, which cover an area of nearly 2000 square degrees on the sky. We calculate cluster membership probabilities and use a Gaussian mixture model method to characterize the red sequence and blue cloud components of our clusters, and we will present our results on properties such as red sequence peak color, slope, and width, and cluster blue fraction, in particular as functions of redshift. Moreover, we introduce a new cluster stellar mass observable, mu*, and will show that it works as a reliable mass proxy for cosmology by comparing our predictions to X-ray measurements. Finally, we will show our results for the redshift evolution of the stellar masses and star formation rates in our cluster member galaxies.

Speaker: Brian Welch (University of Chicago/Fermilab)

6:49 PM A search for BH dark matter using microlensing in the Dark Energy Survey

Massive Primordial Black Holes (MPBH) generated from large inflation-era curvature fluctuations that reenter during the radiation era could constitute the majority of the dark matter, an idea revived by the LIGO observations of merging 30 solar mass black holes. In this model, the mass distribution of MPBH ranges from 0.01 to 100 solar masses, peaking perhaps at 50 solar masses. There is, remarkably, a window in the constraints at these masses; furthermore the MPBH could be clustered, breaking one of the assumptions of microlensing limits. We describe a project that uses the Dark Energy Survey data to perform a microlensing measurement of massive compact objects at 10-100 solar masses. The key idea is that a microlensing event has a duration of t = 2.5 years (M/10M_solar)^{1/2} and thus masses in the range expected for MPBH are observable in the DES. The DES observes its entire footprint twice per year per bandpass, so there are 8 usable visits per year as microlensing is achromatic. The primary difference between this project and the MACHO/OGLE/EROS surveys is that we will use the 10^7 field stars in the DES south galactic cap and not the LMC or Galactic Center. We will describe our expected limits on MPBH mass distributions assuming they make up all of the dark matter.

Speaker: James Annis (Fermilab)

6:50 PM Charged Lepton Flavor Violation in Electron-Positron Scattering: Calculations of Cross Section and Asymmetry Using an Effective Field Theory

We performed theoretical calculations of charged lepton flavor violation (CLFV) cross sections and asymmetries in electron-positron scattering. Examples of CLFV include electron antitau final states and electron antimuon final states. We used an effective field theory that incorporated three types of Beyond Standard Model operators: leptonic operators and radiative operators leading to tree-level diagrams and quark-lepton operators leading to a one-loop diagram. The one-loop diagram was treated in two ways: perturbatively using Standard Model Feynman Rules and non-perturbatively using dispersion relations to account for possible resonance effects. We calculated constraints on the effective coupling constants from current experimental upper bounds. Future colliders such as Belle II and BES III can use our calculations in searches for charged lepton flavor violation.

Speaker: Mr Ching Li (Haverford College)

6:51 PM Zero-Range Effective Field Theory for Resonant Wino Dark Matter

The most dramatic "Sommerfeld enhancements" of neutral-wino-pair annihilation occur when the wino mass is tuned to near critical values where there is a zero-energy S-wave resonance at the neutral-wino-pair threshold. If the wino mass is larger than the critical value, the resonance is a wino-pair bound state. If the wino mass is near a critical value, low-energy winos can be described by a zero-range effective field theory in which the winos interact nonperturbatively through a contact interaction. The effective field theory is controlled by a renormalization group fixed point at which the neutral and charged winos are degenerate in mass and their scattering length is infinite. The parameters of the zero-range effective field theory can be determined by matching wino scattering amplitudes calculated by solving the Schrödinger equation for winos interacting through a potential due to the exchange of weak gauge bosons. The power of the zero-range effective field theory is illustrated by calculating the rate for formation of the bound state in the collision of two neutral winos through the emission of two soft photons.

Speaker: Evan Johnson (Ohio State University)

6:52 PM Impact of Neutrino Decay on Sterile Neutrino Search in IceCube

Anomalies in short-baseline neutrino experiments have suggested the existence of a ~1 eV sterile neutrino. IceCube, an ice-Cherenkov neutrino detector at the South Pole is an ideal testing ground for such neutrinos, but recent searches have found no evidence for them. In a 3+1 sterile neutrino model, decay of the heaviest mass eigenstate to lighter eigenstates is largely unconstrained and could modify the results of the searches in IceCube. We present the results of a phenomenological study where neutrino decay is included as a sub-leading effect to oscillation in a 3+1 model in IceCube.

Speaker: Marjon Moulai (MIT)

6:53 PM Full TPC Signal and Noise Simulation

MicroBooNE is an 89-ton Liquid Argon Time Projection Chamber (LArTPC) and the first of a trio of LArTPCs in the Short Baseline Neutrino (SBN) program which will search for a light sterile neutrino and measure neutrino-argon interaction cross sections. Located in the Booster neutrino beam at Fermi National Accelerator Laboratory, MicroBooNE has taken neutrino data since October 2015. This poster outlines the intricacies of a full TPC noise and signal simulation. More specifically, this poster will detail the noise simulation based on measurement in the data and summarize the ramifications of induced current from nearest neighboring wires and other effects unique to LArTPC technology. The implementation of the full TPC signal and noise simulation is crucial to understanding the detector response for this technology.

Speaker: Ms Brooke Russell (Yale University)

6:54 PM Studies of Radiation Damage to Silicon Photomultipliers

We present results of radiation tests of 1.3×1.3 mm^2 and 2.0×2.0 mm^2 for Hamamatsu silicon photo-multiplier (SiPM) sensors. These studies were performed to evaluate the suitability of the Hamamatsu devices for use in the Mu2e Cosmic Ray Veto. Distinct sets of eight SiPMs were exposed to four different 1 MeV neutron equivalent doses of 200 MeV protons. Measurements of the breakdown voltage, gain and noise rates at different bias overvoltages, photoelectron thresholds, and LED illumination levels were taken before and after irradiation.

Speaker: Dr Sergey Uzunyan (Northern Illinois University, for the Mu2e Cosmic Ray Veto Group)

Poster DPF2017_poster_36x48.pdf

6:55 PM Drifted Charge Extraction in Single Phase LArTPCs

The MicroBooNE detector is the first to be built in the short-baseline neutrino program. It is a single-phase LArTPC built to observe interactions of neutrinos from the on-axis Booster and off-axis NuMI beams at the Fermi National Accelerator Laboratory in Batavia, IL. We describe the concept and procedure of LArTPC drifted-charge extraction which converts the raw digitized TPC waveform to the number of ionized electrons passing through the wire plane at a given time. The proper recovery of the number of ionized electrons from both induction and collection anode wire planes is important to the success of the subsequent reconstruction algorithms. In this poster, we will show the details of the procedure including the key steps of 2D deconvolution and region-of-interest finding.

Speaker: Dr JYOTI JOSHI (Brookhaven National Laboratory)

6:56 PM Liquid argon test of the ARAPUCA device at the National Laboratory of Synchrotron Light in Campinas (São Paulo)

The ARAPUCA is a new concept for liquid argon scintillation detection, particularly suited for large liquid argon time projection chambers. It is constituted by a combination of a passive light collector and photo-sensitive silicon devices, which will allow to improve the detection efficiency of actual devices by an order of magnitude. The basic idea is to trap photons inside a box whose internal surface has an extremely high reflectivity and which is observed by silicon devices (SiPM), so that the detection efficiency is high even with a small active coverage of the internal surfaces. The photon trapping is obtained with a smart combination of a short-pass dichroic filter and two different wavelength shifters, one of each side of the filter, which represents the acceptance window of the ARAPUCA. We will report of the first liquid argon test of the device in Brazil - at the National Laboratory of Synchrotron Light in Campinas (Sao Paulo) - which, to our knowledge, is the first liquid argon experiment in Latin America ever done up to now. The device was exposed to an alpha source of known energy so that it was possible to estimate its detection efficiency. The results were excellent and in perfect agreement with Monte Carlo predictions.

Speaker: Mrs Marina Guzzo (UNICAMP)

6:57 PM Pion Production Measurements at MINERvA

The MINERvA collaboration has performed important measurements on pion reactions off a scintillator (CH) target, using the NuMI beam at Fermilab in both neutrino and anti-neutrino configurations. These reactions, used by generators to improve nuclear models, are essential for a better understanding of neutrino oscillation experiment results. An important fraction of the signal and background systematic uncertainties in this experiments come from the misidentification of these reactions. The current NOvA era, with a more energetic and intense NuMI beam, allows MINERvA to perform a more extensive exploration of these neutrino reactions, with more exciting results coming.

Speaker: Prof. Gonzalo Diaz (Rochester University)

6:58 PM MuSim, a Graphical User Interface for Multiple Simulation Codes

MuSim is a user-friendly program designed to interface to many different particle simulation codes, regardless of their data formats or geometry descriptions. It presents the user with a compelling graphical user interface that includes a flexible 3-D view of the simulated world plus powerful editing and drag-and-drop capabilities. All aspects of the design can be parameterized so that parameter scans and optimizations are easy. It is simple to create plots and display events in the 3-D viewer, allowing for an effortless comparison of different simulation codes. Simulation codes: G4beamline 3.02, MCNP 6.1, and MAD-X; more are coming. Many accelerator design tools and beam optics codes were written long ago, with primitive user interfaces by today's standards. MuSim is specifically designed to make it easy to interface to such codes, providing a common user experience for all, and permitting the construction and exploration of models with very little overhead. For today's technology-driven students, graphical interfaces meet their expectations far better than text-based tools, and education in accelerator physics is one of our primary goals.

Speaker: Dr Mary Anne Cummings (Muons, Inc.)

6:59 PM Pre-production and quality assurance of the Mu2e Silicon Photomultipliers

The Mu2e calorimeter is composed by two disks of 1348 un-doped parallelepiped CsI crystals of 34x34x200 mm^3 dimension, each one readout by two large area SiPM arrays. We translated the calorimeter requirements in a series of technical specifications for the SiPMs that are summarized by the following list: - high gain, above 10^6, for each monolithic (6x6) mm^2 SiPM cell; - good photon detection efficiency, PDE, of above 20% at 310 nm to well match the light emitted by the un-doped CsI crystals; - large active area that, in combination with the PDE, could provide a light yield of above 20 p.e./MeV; - fast rise time and a narrow signal width to improve time resolution and pileup rejection; - Mean to Time Failure (MTTF) of O(10$^6$) hours; - good resilience to neutrons for a total fluency up to 10^12 n(1 MeV-eq)/cm^2. A modular and custom SiPM layout has been chosen to satisfy these requirements. A pre-production of 150 Mu2e SiPMs has been procured by three international firms (Hamamatsu, Sensl and Advansid). A detailed quality assurance, QA, has been carried out on each SiPM. A summary of the techniques used and of the QA characterization of the sensors will be shown.

Speaker: Mrs Raffaella Donghia (LNF - INFN)

7:00 PM NuMI Target and Horn Studies for NOvA

The NuMI Off-axis νe Appearance (NOvA) experiment is a long baseline neutrino oscillation experiment designed to measure both νe appearance and νµ disappearance. The Neutrinos at the Main Injector (NuMI) facility produces an intense muon neutrino beam by directing 120 GeV protons onto a 2.5 interaction length graphite target segmented into 48 fins. The secondary particles produced at the target are focused by two magnetic horns and followed by a long decay pipe where most of the short-lived particles (pions and kaons) decay to neutrinos.The NOvA detectors are placed 14.6 mad off-axis to the NuMI beam. In this poster we present an update on the target and horn set configuration study for an optimized NOvA neutrino flux. We found that a new target design with 24 fins upstream and 24 fins extended inside of the first horn produces more off-axis neutrino flux than the existing NOvA target that has 48 fins upstream of the first horn. We show also our progress on optimizing the position of the second horn and the prospect to include a third horn (identical to the existing second horn) into the focusing system. Additional studies of material in the beam downstream of the horns are also under study.

Speaker: Ms Jyoti Tripathi (Panjab University)

7:01 PM Data Acquisition and Triggering for the KOTO Experiment

The KOTO experiment at the J-PARC research facility in Tokai-mura, Japan aims to observe and measure the rare decay of the neutral kaon, KL → π0νν¯, in which a neutral kaon decays to a neutral pion and a neutrino antineutrino pair. This decay has a Standard Model predicted branching ratio of (3.00 ± 0.30) x 10^−11. While this decay is extremely rare, it is one of the best decays for studying charge-parity (CP) violation in the quark sector. Because the signal decay has such a low branching ratio, the data acquisition (DAQ) system for the KOTO experiment uses three levels of trigger cuts to selectively record events of interest and discard background events. The KOTO DAQ system is designed to have a highly optimized signal acceptance and background rejection due to the high trigger rate. This poster will focus on these details and how the triggers and DAQ system address the physics requirements of the detectors.

Speaker: Ms Melissa Hutcheson (University of Michigan)

7:02 PM Large Neutrino Mixing Angles in Minimal SO(10) Unification

The possibility of generating small neutrino mass and large neutrino mixing angles, in the context of the most economic Yukawa sector of non-supersymmetric SO(10) unification is studied. In SO(10) grand unification, the mass matrices of the quarks and leptons are related and given in terms of the same fundamental Yukawa coupling matrices. This is why, it is highly challenging to reproduce the small quark mixings and large neutrino mixings simultaneously. In this work, the minimal SO(10) grand unified theory consistent with these phenomenological requirements is constructed. Our study shows that, if SO(10) gauge symmetry is the only symmetry of the theory, then the Yukawa sector consists of a real 10, a real 120 and a complex 126 dimensional representations. This minimal setup demands the neutrino mass hierarchy to be normal ordering and predicts the two experimentally yet unmeasured quantities, the leptonic Dirac CP-violating phase and the lightest neutrino mass. Gauge coupling unification and proton decay are also analysed.

Speaker: Shaikh Saad (Oklahoma State University)

7:03 PM Cosmic Ray Backgrounds in the Mu2e Experiment at Fermilab

The Mu2e experiment will study charged lepton flavor violation by searching for the neutrinoless, coherent conversion of a 𝜇− to an 𝑒−. Such a process will result in an electron of 105 MeV energy. A major background source comes from cosmic-ray muons which can either be misidentified as signal electrons or produce 105 MeV electrons. Such events will occur at a rate of approximately one per day. An active veto detector surrounding the apparatus will be used to detect incoming cosmic-ray muons. Results will be shown from one of the most extensive simulation campaigns ever undertaken in which the cosmic-ray background from several times the entire running period was simulated: over 1012 generated cosmic-ray muons.

Speaker: Dr Ralf Ehrlich (University of Virginia)

Poster poster_DPF2017_5.pdf

7:04 PM Muon Tomography of Galeras Volcano: first results leaded by young scientists in Colombia

Muon radiography is based on the observation of the absorption of muons in matter, as the ordinary radiography does by using X-rays.The interaction of cosmic rays with the atmosphere produce Extensive Air Showers (EAS), which provide abundant source of muons. These particles can be used for various applications of muon radiography, in particular to study the internal structure of different volcanoes edifice. In this talk we will present results leaded by young scientists in Colombia, and the relevance to provide guidance to future young undergraduate and high school students in software as ROOT, GEANT4 and C++ and their applications in fields as high energy physics. As part of the results to be presented, we will show the first study of the muon lateral distribution at Pasto City altitude (4276 m a.s.l.) using CORSIKA to model the interaction of the cosmic rays with the atmosphere. Furthermore the first simulation in GEANT4 of an active volcano in Pasto city (Colombia) and a particle detector located near the volcano cone will be presented.

Speakers: Dr Alex Tapia (University of Medellin), Dr David Martinez Caicedo (Illinois Institute of Technology)

7:05 PM Radiopurity Screening and Radiological Simulation for DUNE

The design of the far detector of the Deep Underground Neutrino Experiment (DUNE) consists of four 10 kton supermodules, each filled with liquid Argon and to be located underground at SURF/SD. Radiological backgrounds are mostly relevant for the low-energy physics of DUNE, such as supernova neutrinos. Radiopurity requirements are driven by the intrinsic Ar-39 contamination of about 1 Bq/kg for undepleted liquid argon. The long electron drift length of about 3.5 m inside each time projection chamber, as well as the one sided light collection, complicate further the impact of radiological backgrounds from detector materials. The radiopurity screening of detector materials will be discussed and how the results enter a comprehensive radiological simulation using LArSoft. Additionally, LArSoft improvements to the usability of the photon simulation are presented.

Speaker: Jason Stock (South Dakota School of Mines and Technology)

7:06 PM Sterile neutrino search in the NOvA Far Detector.

The majority of neutrino oscillation experiments have obtained evidence for neutrino oscillations that are compatible with the three-flavor model. Explaining anomalous results from short-baseline experiments, such as LSND and MiniBooNE, in terms of neutrino oscillations requires the existence of sterile neutrinos. The search for sterile neutrino mixing conducted in NOvA uses a long baseline of 810 km between Near Detector (ND) at Fermilab and Far Detector (FD) in Minnesota. The signal for sterile neutrino oscillations is a deficit of neutral-current neutrino interactions at the FD with respect to the ND prediction. In this poster, I will present the analysis improvements that we are implementing for future NC sterile neutrino searches with NOvA. These include: improved modelling of our detector response; the inclusion of NC 2p2h interaction modelling; implementing a better energy reconstruction technique; and including possible oscillation due to sterile neutrinos in the ND. This improvements will enable us to do a simultaneous ND-FD shape fit of the NC energy spectrum covering a wider sterile mass range than previous analyses.

Speaker: Mr SIJITH EDAYATH (COCHIN UNIVERSITY OF SCIENCE AND TECHNOLOGY, INDIA)

7:07 PM Exploring end-to-end image-based deep learning for particle & event classification

An essential part of new physics searches at the Large Hadron Collider at CERN involves event classification, or distinguishing signal decays from one of its many background look-alikes. Traditional techniques have relied on reconstructed particle candidates and their physical attributes. However, such reconstructed data are the result of a long, potentially lossy process of forcing the raw sensor data into progressively more physically intuitive quantities. Meanwhile, powerful image-based machine learning algorithms have emerged that are able to directly digest raw sensory data and output a prediction---so called end-to-end deep learning classifiers. We explore the use of such algorithms to perform physics classification using raw sensory data from the CMS detector. As proof of concept, we classify photon- versus electron-induced ECAL showers and compare the performance of using raw sensor data versus shower shape data.

Speaker: Michael Andrews (Carnegie Mellon University)

7:08 PM Observing Neutrinos from the Next Galactic Supernova with the NOvA Detectors

The next galactic core-collapse supernova will deliver a wealth of neutrinos which for the first time we are well-situated to measure. These explosions produce neutrinos with energies between 10 and 100 MeV over a period of tens of seconds. Galactic supernovae are relatively rare events, occurring with a frequency of just a few per century. It is therefore essential that all neutrino detectors capable of detecting these neutrinos are ready to trigger on this signal when it occurs. This poster describes a data-driven trigger which is designed to detect the neutrino signal from a galactic core-collapse supernova with the NOvA detectors. The trigger analyzes 5ms blocks of detector activity and applies background rejection algorithms to detect the signal time structure over the background. This background reduction is an essential part of the process, as the NOvA detectors are designed to detect neutrinos from Fermilab's NuMI beam which have an average energy of 2 GeV--well above the average energy of supernova neutrinos.

Speaker: Justin Vasel (Indiana University)

7:09 PM Design and Simulation of the IsoDAR RFQ Direct Injection System and Spiral Inflector

The IsoDAR (Isotope Decay-At-Rest) experiment aims to explore physics beyond the standard model by searching for anomalous neutrino oscillations indicative of sterile neutrinos. The experiment requires a primary beam of H2+ ions to be accelerated to an energy of 60 MeV/amu at a current of 5 mA, which will be accomplished by using a high-power compact cyclotron. One of the challenges in this scheme is the injection into the cyclotron, where space-charge forces are strong and acceptance into a small RF phase window is desired. We aim to achieve this by using a Radio-Frequency Quadrupole (RFQ) injector, brought very close to the center of the cyclotron, which is capable of efficiently transporting and bunching the beam before an electrostatic deflector - called a spiral inflector - turns the beam onto the mid-plane of the cyclotron for acceleration. Careful design and simulation of this process is necessary. To this end, electric and magnetic field maps are generated in OPERA and loaded into the accelerator simulation code OPAL to run start-to-end simulations of the injection system and first few turns in the cyclotron. Several iterations between RFQ design and spiral inflector simulations will be necessary to optimize the geometry of the spiral inflector, i.e. to minimize the number of ions lost during injection and maximize beam current. I will present the development and latest results of the particle simulations and design optimizations for the IsoDAR RFQ direct injection project, particularly the spiral inflector.

Speaker: Philip Weigel (Drexel University)

7:10 PM Seasonal Variations of multiple-muons in NOvA

Seasonal variations of cosmic ray muons have been well-measured by a number of underground experiments at a variety of overburdens and it has been found that the rate of muons increases in the summer and decreases in the winter. This is understood from the properties of the atmosphere as the temperature varies. But with large statistics the seasonal variation of multiple muons was measured in the MINOS ND (225 mwe) and the MINOS FD (2100 mwe). The rates increase in the winter and decrease in the summer, opposite to the result for single muons. Several hypotheses for this unexpected result were considered, but the effect is not currently explained. New data from the NOvA ND (225 mwe) will be used to study the situation further.

Speaker: Prof. Philip Schreiner (Benedictine University)

7:12 PM ProtoDUNE Trigger Study

DUNE is an experiment aimed at determining the mass hierarchy of neutrinos and measuring parity violation in the neutrino sector. The ProtoDUNE detector is a prototype Liquid Argon (LAr) TPC for the DUNE far detector and will be operated at CERN to primarily study hadronic interactions in LAr at the few GeV energy scale. Due to the operation of ProtoDUNE in a beamline near the surface, the detector will need to be able to discern between the intended beam particles and background events arising primarily from cosmics and beam byproducts such as halo muons and other contaminants. Thus, in order to reduce the data rates to manageable levels, ProtoDUNE will employ the use of triggers. The Central Trigger Board (CTB) was designed to make use of the the available information from the Cosmic Ray Tagger, Beam Instrumentation, and Photon Detection System to generate triggers for ProtoDUNE. The CTB itself is a custom Printed Circuit Board which houses an FPGA (Xilinx Zynq 7Z020), where the trigger logic is implemented in firmware, and an embedded processor running a Linux distribution. In this poster we discuss possible trigger schemes and their viability based on timing simulations.

Speakers: David Rivera (University of Pennsylvania), Jonathon Sensenig (University of Pennsylvania)

7:13 PM Ongoing Community Efforts in Machine Learning in Particle Physics

In this poster we will highlight the different community efforts in machine learning in high-energy physics and their positive impact on the community. These efforts include the Inter-Experimental (IML) LHC Machine Learning working group, the Machine Learning group at Fermilab, aMVA4NewPhysics, INSIGHTS, Data Science at HEP workshops. Additional opportunities in the areas of education, training and outreach, as well as involvement of the broader ML community would further enable the progress of machine learning in HEP.

Speakers: Ms Fernanda Psihas (Indiana University), Sergei Gleyzer (University of Florida)

7:14 PM Silicon and Germanium Ionization Yield Measurements with Neutron Beams

SuperCDMS SNOLab is using low energy threshold Si/Ge detectors for dark matter direct searches. One mode of operation for the experiment runs detectors in a high-voltage-biased mode, to use Neganov-Luke Amplification. Understanding the ionization yield of low-energy nuclear recoils is essential for interpreting dark matter search data taken in this mode. We present two calibration experiments designed to measure the ionization yield with the CDMS-style detectors in monoenergetic neutron beams. One experiment is performed with an Adiabatic-Demagnetization Refrigerator at the TUNL facility, and the other one with a Dilution Refrigerator in the NEXUS@FNAL facility with a DD neutron generator. In this poster, we show the experimental setups and simulation results of this calibration program.

Speaker: Ziqing Hong (Northwestern University)

7:15 PM A uniform magnetic field generator system and a Cu hybrid cosmic ray detector of 4 channels

In the universe, there are several sources that produce very energetic cosmic rays that interact with the Earth’s atmosphere and create new low energy particles. These particles can be electrically charged and neutral. There are different methods to detect them, according to its interaction with a medium such as the ionization of a material and Cerenkov radiation, among others. An obtained signal can be validated with another detection method, as in a Cu hybrid detector, or with a specific array of detectors. Knowing some points where a particle has passed through, inside a magnetic field, its trajectory and electric charge can be determined. This work presents the design, construction and characterization of a uniform magnetic field generator system and a Cu hybrid cosmic ray detector of 4 channels. Details and some preliminary results will be presented.

Speakers: Mr Francisco Rosas-Torres (Universidad de Guanajuato), Prof. Julian Felix (Universidad de Guanajuato), Ms Karla Natalia Herrera Guzman (Universidad de Guanajuato), Mr Raul Alejandro Gutierrez Sanchez (Universidad de Guanajuato)

7:16 PM Effects of Magnetic Horn Geometry Uncertainty on Neutrino Flux at DUNE

The goals of the Deep Underground Neutrino Experiment (DUNE) at Fermi Lab, is to precisely measure neutrino and antineutrino oscillation properties to determine if charge-parity (CP) symmetry is violated in the lepton sector, thus providing a possible explanation for the matter-antimatter asymmetry in the universe, and to measure the neutrino mass ordering. To maximize the neutrino flux in the desired energy range, the secondary charged mesons produced in the interactions of an intense proton beam with a target are focused using the magnetic field created by a set of horns. To ensure an accurate understanding of the beam line and the neutrino flux, it is essential o study uncertainties stemming from the geometry to these horns. In this study, two geometric parameters are considered, (i) the eccentricity and (ii) the ellipticity of the inner conductors. The effects of eccentricity and ellipticity of the inner conductor to the resulting neutrino flux are presented.

Speaker: Amador Eric (University of Texas Arlington)

7:17 PM A particle hypothesis based approach for energy estimation in muon neutrino charged current events at NOvA

NOvA is a neutrino oscillation experiment which probes the neutrino CP-violating phase and mass ordering, as well as improve limits on current neutrino oscillation parameters, by measuring oscillations of muon neutrinos and muon anti-neutrinos produced in the NuMI beam at Fermilab. The muon neutrino disappearance analysis specifically focuses on the measurements of $\Delta m_{32}^2$ and $\sin^2(\theta_{23})$. Choosing the right energy estimator is key to oscillation analyses; the estimator currently used by the muon neutrino disappearance analysis identifies the muon in an event, and labels all other energy depositions as hadronic energy. However, it is possible to use a version of NOvA's convolutional visual network (CVN) to separate the hadronic energy into its individual components. Once the particle is identified using CVN, we measure the energy of these tracks with a method called "Break Point Fitting" developed to track a scattering particle passing through a detector that takes measurements at discrete intervals. The track is fit under three assumptions: muons, protons, and pions, and the energy is calculated for each. The combination of tagging particles with CVN and more accurate energy calculation with BPF will allow for a more robust energy estimator, with a possibility for an improved energy resolution.

Speaker: Dr Erica Smith (Indiana University)

7:18 PM Studies of effect of aging and studies to optimize scintillation counter response for the Mu2e Cosmic Ray Veto System

The Mu2e experiment will conduct a search for charged lepton flavor violation through observation of a neutrino-less muon-to-electron conversion. In order to reduce backgrounds from cosmic ray muons, a cosmic ray veto consisting of counters made from scintillating plastic will be read out by wavelength-shifting fibers. The cosmic ray veto must have an overall detection efficiency of 99.99%. In order to meet this requirement, the light yield must be optimized and well understood. The counters are designed to meet photoelectron yield requirements over a working lifetime of 10 years. Aging studies are measuring the temporal response of the light yield of the scintillator and transmission of light through optical fibers. An oven has been used to heat samples to simulate an advanced aging process. Tests include measuring the attenuation of light through the aged optical fiber using an LED flasher with a photodiode or spectrometer and measuring the response of aged counters to radioactive sources and cosmic rays. We will describe the affect from aging on the counter and fiber response as well as several measurements aimed at improving the light yield, including the investigation of different reflectors at the far end of counters with single-ended readout.

Speakers: Mr Pedrom Zadeh (University of Virginia), Peter Farris (University of Virginia)

7:25 PM R&D Toward Ton-Scale HPGXe Neutrinoless Double Beta Decay Experiments

The NEXT collaboration is developing a sequence of high pressure xenon gas time projection chambers with the aim of creating a ton-scale, very low background neutrinoless double beta decay search. While most aspects of this technology are easily scalable, some detector elements require R&D in order to be realized on a large scale. This poster will describe a new, large-scale test facility under development at the University of Texas at Arlington, which will be used to test electroluminescent gain regions, high voltage feed-throughs and field cage elements for 100kg- and ton-scale xenon gas experiments.

Speaker: Leslie Rogers (University of Texas in Arlington)

7:26 PM Site characterization for ground-based CMB observations with a 183GHz radiometer

The cosmic microwave background (CMB) is a rich source of information about the cosmos. Over the past ten years, gains in experimental sensitivity have enabled ground-based instruments to begin the search for B-mode polarization in the CMB as a test of the inflationary paradigm. However, the atmosphere is not fully transparent in the 35-270GHz region targeted by these observations. Poorly-mixed and rapidly-varying water vapor in the atmosphere presents a challenging source of sky noise for CMB telescopes. Ground-based experiments minimize atmospheric perturbations by selecting dry, high-altitude sites where the amount of precipitable water vapor (PWV) in the atmosphere is as low and as stable as possible. The leading sites in use for present experiments are the South Pole and Chajnantor Plateau, Chile. The next-generation CMB-S4 experiment will make use of these two locations but is also turning an eye to potential sites in the northern hemisphere with the goal of increasing the observed sky fraction. To better understand the effects of PWV on current and future CMB experiments, we have undertaken the first coordinated measurement of atmospheric water vapor fluctuations with high time resolution over long time scales at sites around the world. We use the Dicke-switched 183GHz water vapor radiometer (WVR) initially commissioned for the Atacama Large Millimeter/submillimeter Array (ALMA) and built by Omnisys Instruments AB, with the addition of custom azimuth/elevation scanning optics and a temperature-controlled environmental enclosure. Two identical units are currently deployed at the South Pole and Summit Station, Greenland. We report here on the performance and measurements from these WVRs, and we discuss how these atmospheric measurements might drive site selection and design choices for future telescopes.

Speaker: Nicole Larsen (U. Chicago, KICP)

Tuesday, August 1

8:30 AM → 10:15 AM Plenary: Tuesday morning

Convener: Mr Myron Campbell (University of Michigan)

slides dpf_proceedings_aug2017.pdf

8:30 AM CERN program and plans for the European Strategy

Speaker: Prof. Eckhard Elsen (CERN)

Slides CERN_Program_and_Plans.pdf

9:00 AM Next European strategy process

Speaker: Prof. Sijbrand de Jong (Roadbed University Nijmegen and Nikhef)

Slides CERN_strategy2020_DPF2017.pptx

9:15 AM Asia particle physics program

Speaker: Sachio Komamiya (The University of Tokyo)

Slides DPF_Komamiya.pdf

9:45 AM US Particle Physics Program

Speaker: Prof. JoAnne Hewett (SLAC)

Slides DPF17_Hewett.pdf

10:15 AM → 10:45 AM Break

10:45 AM → 12:15 PM Beyond Standard Model: Tuesday morning

Convener: Prof. Howard Baer (University of Oklahoma)

10:45 AM Spectroscopy of lattice SU4 gauge theory with fermions in multiple representations

We study the spectroscopy of an SU(4) gauge theory with dynamical fermions in both the fundamental and the two-index antisymmetric representations. Such theories are of interest in the study of Physics Beyond the Standard Model, specifically in the context of partial compositeness. We discuss the spectrum of this theory and its implications.

Speaker: Dr Venkitesh Ayyar (University of Colorado, Boulder)

Slides vayyar_dpf2017.pdf

11:01 AM Thermodynamics of SU(4) gauge theory with fermions in multiple representations

We study the phase structure of SU(4) gauge theory with dynamical quarks in both the fundamental and two-index antisymmetric representations. Such "multi-representation" theories have been speculated to exhibit separated phase transitions, but our lattice calculations suggest the existence of only a single thermal phase transition: both species of fermion appear to confine and break chiral symmetry simultaneously. We investigate the order of the combined phase transition in various limits of the theory, and compare to theoretical expectations based on chiral symmetry.

Speaker: Daniel Hackett (University of Colorado, Boulder)

Slides hackett-dpf2017.pdf

11:17 AM Search for Vector-like Top Quarks in di-Leptons

We present a search for the pair-production of a vector-like top quark partner T of charge + 2/3, using proton-proton collision data at √s=13 TeV collected by the CMS Experiment in 2016 at the CERN LHC. Our search targets T quarks decays to final states with two light charged leptons, b-jets, and multiple light flavored jets. Both same-sign and opposite sign di-lepton channels are considered.

Speaker: Dr Anthony Barker (Purdue University)

Slides DPF_VLQ_to_2lep_Barker.pdf

11:33 AM Search for vector-like quarks with oppositely-charged dilepton pairs, jets, and missing transverse energy in proton-proton collisions at centre-of-mass energy of 13 TeV

We Present results of the search for pair produced Vector-like T quark using the proton-proton Collison data collected by the CMS experiment in 2016 with integrated luminosity of 35.9 /fb at a centre-of-mass energy of 13 TeV . Vector-like quarks appear in several extensions of the standard model, and can cancel the diverging loop corrections to the Higgs mass, and thus stabilize it at the electroweak scale.The T quark can decay in to either of three states, bW, tZ of tH. The pair produced T final state consists of two oppositely charged electrons or muons consistent with decay products from Z boson, jets and MET. We set limits on mass of the T quark for various branching ratios.

Speaker: Mr Rachitha Mendis (Kansas State University)

Slides VLQTTanalysis_v5.pdf

11:45 AM Inclusive search for vector-like T quark pairs in leptonic final states in proton-proton collisions at √s = 13 TeV

A search is presented for pair production of heavy vector-like T quarks using proton- proton collisions were collected by the CMS experiment at the CERN LHC in 2016 with an integrated luminosity of 35.9 fb−1. A vector-like T quark of charge 2e/3 is predicted to decay to bW, tZ, and tH, so pair production of T quarks yields a wide array of final states. This inclusive search is performed in three channels: a single lepton channel that identifies boosted hadronic W and Higgs boson decays, same-sign dilepton channel and a trilepton channel that is enriched in Z boson decays. Production of vector-like B quarks that decay to tW, bZ, and bH are also considered. Results remain blinded at this time, but if no excess of data is observed this search will exclude T quark masses in the range of 1090 – 1210 GeV for many branching ratio combinations.

Speaker: Mr Rizki Syarif (Brown University)

Slides July17-2017_DPFconf_v6_final.pdf

11:57 AM Search for vector-like B quarks with oppositely-charged dilepton pairs in proton-proton collisions at 13 TeV

We present the results of searches for pair-produced vector-like B quarks using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. The searches are performed using opposite sign dileptons from a Z boson decay. Vector-like quarks, having symmetric interactions in the weak sector of the Standard Model (SM), are postulated as an alternate mechanism to solve the Hierarchy problem of the SM, compared to SUSY models. The search focuses on a vector-like quark doublet, meaning the vector-like B quark can decay to two potential channels: bZ or bH. Using a chi-squared minimization technique, we are able to reconstruct the potential vector-like B invariant mass. This mass is used to distinguish signal from background. This search allows us to probe for B quark masses up to 1.1 GeV assuming a 100% branching ratio of the B quark decay.

Speaker: Tyler Mitchell (Kansas State University)

Slides OS2L_BB_DPF17_v5.pdf

10:45 AM → 12:15 PM Cosmology and Astrophysics: Tuesday morning

Convener: Prof. Neelima Sehgal (Stony Brook University)

10:45 AM Galaxy Cluster Science Results with the Dark Energy Survey

Constraining LambdaCDM cosmology with galaxy cluster abundance is one of the fundamental goals for the Dark energy survey (DES). Based on observations collected in the first year, DES has identified many thousands of clusters out to redshift 1.0. Weak lensing and multi-wavelength studies with X-ray data and cosmic microwave background are performed to provide inputs to the cosmology constraint analysis. Astrophysical studies to understand cluster evolution over time is yielding fruitful results. This presentation will present DES science results from galaxy cluster cosmology and astrophysics studies.

Speaker: Dr Yuanyuan Zhang (Fermilab)

Slides 2017_July_DPF_YuanyuanZhang.pdf

11:05 AM Cluster Cosmology with the South Pole Telescope

The South Pole Telescope (SPT) is a 10-meter millimeter-wavelength telescope optimized for high resolution observations of the Cosmic Microwave Background (CMB). The SPT has been used to conduct several wide-area surveys: the 2500-square-degree SPT-SZ survey (completed in 2011) as well as two recently completed surveys conducted using the SPTpol receiver: the 500-square-degree SPTpol Survey and the SPTpol Extended Cluster Survey (the former surveyed ~20% of the SPT-SZ footprint to a level 3x deeper than the SPT-SZ survey, the latter covered an additional 2500-square-degrees to somewhat shallower depths than SPT-SZ). One of the primary objectives of the wide-area SPT surveys was the construction of a mass-limited sample of galaxy clusters identified via the thermal Sunyaev- Zel’dovich (SZ) effect, through which massive clusters imprint subtle temperature distortions on the CMB sky. The abundance of such clusters is a powerful cosmological probe as it depends sensitively upon both the expansion history of the universe and the growth of density fluctuations. In this talk I will discuss progress analyzing these three datasets including updated cosmological constraints from the initial SPT-SZ cluster sample using new weak lensing data as well as ongoing work characterizing the strong lensing properties of these systems using the new PISCO imager on Magellan. The results presented in this talk will be significantly improved with data from the SPT-3G survey---deployed in Jan 2017---that will identify an order of magnitude more clusters than past generation SZ surveys.

Speaker: Dr Lindsey Bleem (Argonne National Laboratory)

Slides Bleem_APS_DPF_Aug17.pdf

11:25 AM Fundamental Physics from SZ Cluster Surveys with CMB and Optical Lensing Mass Calibration

Future high resolution CMB experiments will detect tens of thousands of galaxy clusters. The abundance of clusters as a function of mass and redshift allows us to map the growth of structure and consequently measure the sum of neutrino masses and constrain the nature of dark energy. Such measurements are currently limited by our ability to calibrate the masses of galaxy clusters. Planned CMB experiments will be sensitive enough to offer competent mass calibration from CMB lensing that is complementary to optical weak lensing of galaxies. I will review and compare the prospects of CMB and optical mass calibration, discussing this in the context of methods applied to ongoing CMB experiments like Advanced ACT, and focusing on systematics such as contamination from astrophysical foregrounds.

Speaker: Dr Mathew Madhavacheril (Princeton University)

Slides DPFTalk.pdf

11:45 AM Measuring the pairwise kinematic Sunyaev-Zel'dovich effect with the Atacama Cosmology Telescope

We have made improved measurements of the kinematic Sunyaev-Zel’dovich (kSZ) effect using data from the Atacama Cosmology Telescope (ACT) and the Baryon Oscillation Spectroscopic Survey (BOSS). A map of the Cosmic Microwave Background (CMB) composed from two seasons of observations each by ACT and the Atacama Cosmology Telescope Polarimeter (ACTPol) receiver was used. The mean pairwise baryon momentum associated with the positions of 50,000 bright galaxies in the BOSS DR11 Large Scale Structure catalog was evaluated over the 600 square degrees of overlapping sky area. The kSZ signal arising from the large-scale motions of clusters was measured by fitting data to an analytical model, with the free parameter of the fit determining the optical depth to microwave photon scattering for the cluster sample. Our most conservative simulation-based uncertainty estimates for the mean pairwise momenta as a function of galaxy separation gave signal-to-noise values between 3.6 and 4.1 for various luminosity cuts. A novel approach to estimating cluster optical depths from the average thermal Sunyaev-Zel’dovich (tSZ) signal at the cluster positions was explored, and our results are broadly consistent with those obtained from the kSZ signal. In the future, the tSZ signal may provide a valuable source of cluster optical depths, enabling the extraction of velocities from the kSZ sourced mean pairwise momenta. The mean pairwise velocity of clusters is sensitive to the growth of structure and the Universe’s expansion history, making it an excellent probe for gravity on large scales and a means for neutrino mass sum constraints. New CMB maps from multi-frequency ACTPol observations promise to improve statistics and systematics for SZ measurements. With these and other upcoming data, such as measurements from DESI, CCAT-prime, and Simons Observatory, the pairwise kSZ signal is poised to become a powerful new cosmological tool, able to test models of modified gravity and dark energy and constrain neutrino physics.

Speaker: Ms Eve Vavagiakis (Cornell University)

Slides APSDPF_Aug2017_emv.pdf

12:00 PM Delensing CMB B-modes: results from SPT.

A promising signature of cosmic inflation is the presence of a "B-mode" component in the polarization of the Cosmic Microwave Background (CMB) induced by primordial gravitational waves. For many inflation models, this B-mode signal is predicted to be at a level detectable in the near future. However, current searches are limited by a "lensing B-mode" component that is produced by gravitationally lensed primordial E modes. In order to potentially detect the inflationary signal from B-mode measurements, lensing B modes must be characterized and removed in a process referred to as "delensing." This process has been studied extensively theoretically and with simulations, but has not been performed on polarization data. In this talk, we present the results of CMB B-mode delensing using polarization data from the South Pole Telescope polarimeter, SPTpol. Furthermore, using realistic simulations that include filtering and realistic CMB noise, we will show what is currently limiting the delensing efficiency and how it will rapidly improve in the near future.

Speaker: Dr Kimmy Wu (UC Berkeley)

Slides Wu_delensing_20170801.pdf

10:45 AM → 12:15 PM Dark Matter: Tuesday morning

Convener: Prof. Rafael Lang (Purdue University)

10:45 AM Flavored Dark Matter and a Secret Asymmetry

I will present a mechanism where the dark matter abundance arises from asymmetries generated in the early universe, even though the distribution of dark matter may appear symmetric today. This mechanism can be realized in the framework of of flavored dark matter, among others. I will discuss the experimental signatures of this setup, as well as generic phenomenological features of the flavored dark matter scenario that set it apart from single-flavor dark matter.

Speaker: Prof. Can Kilic (University of Texas at Austin)

Slides DPF_FDM.pdf

11:00 AM Sommerfeld-Enhanced J-Factors For Dwarf Spheroidal Galaxies

For models in which dark matter annihilation is Sommerfeld-enhanced, the annihilation cross section increases at low relative velocities. Dwarf spheroidal galaxies (dSphs) have low characteristic dark matter particle velocities and are thus ideal candidates to study such models. In this paper we model the dark matter phase space of dSphs as isotropic and spherically-symmetric, and determine the J-factors for several of the most important targets for indirect dark matter searches. For Navarro-Frenk-White density profiles, we quantify the scatter in the J-factor arising from the astrophysical uncertainty in the dark matter potential. We show that, in Sommerfeld-enhanced models, the ordering of the most promising dSphs may be different relative to the standard case of velocity-independent cross sections. This result can have important implications for derived upper limits on the annihilation cross section, or on possible signals, from dSphs.

Speaker: Jason Kumar (University of Hawaii)

Slides DPF2017a.pdf

11:15 AM Searches for dark matter with the Super-Kamiokande detector

Indirect searches for dark matter using data collected with the Super-Kamiokande detector in years 1996-2016 were performed. The excess of neutrinos from possible dark matter sources such as Sun, Earth and Galactic Center, compared to the expected atmospheric neutrino background was searched. Event samples including both electron and muon neutrinos covering a wide range of energies were used, with sensitivity to dark matter masses down to tens of GeV. Allowed number of dark matter induced neutrinos which can be contained in SK data so far was estimated. Obtained limits on DM induced neutrino flux were related to limit on spin-dependent (for the Sun) and spin-independent (for the Sun and the Earth's core) WIMP-nucleon cross section. In case of Galactic Center analysis, the upper limit on the self-annihilation cross-section was derived.

Speaker: Ms Katarzyna Frankiewicz (National Centre for Nuclear Research)

Slides DPF2017_Frankiewicz_SK.pdf

11:30 AM Dark Matter Searches with HAWC

The High Altitude Water Cherenkov (HAWC) gamma-ray observatory is a wide field-of-view observatory sensitive to 0.5 TeV - 100 TeV gamma-rays and cosmic-rays. The HAWC observatory performed an indirect search for dark matter via GeV-TeV photons resulting from dark matter annihilation and decay considering various sources, including dwarf spheroidal galaxies (dSphs), the M31 galaxy, and the Virgo cluster. HAWC has not seen statistically significant excess from these sources. We searched for dark matter annihilation and decay at dark matter masses above 1 TeV, including masses higher than 70 TeV that are currently unconstrained. We will present the annihilation cross-section and decay lifetime limits.

Speaker: Dr J. Patrick Harding (Los Alamos National Laboratory)

Slides DPF_Harding.pdf

11:45 AM Supersymmetric Resonant Dark Matter: an Explanation to AMS-02 Positron Excess

We construct a thermal dark matter model with the dark matter annihilations mediated by a resonance to explain the positron excess observed by PAMELA, Fermi-LAT and AMS-02 and to satisfy other experimental constraints. Based on a spontaneous breaking global symmetry of SU(3)/SU(2)xU(1), we provide a natural explanation for why the resonance mass is very close to twice of the dark matter mass. The pseudo Nambu Goldstone Bosons in the coset space, with a mass below one GeV, mainly decay into two muons and provide a good fit to the positron excess spectrum. I will also discuss other dark matter phenomenology of our model.

Speaker: Joshua Berger (University of Wisconsin-Madison)

Slides jberger.pdf

12:00 PM Explaining Diverse Rotation Curves of Spiral Galaxies with Self-Interacting Dark Matter

Self-interacting dark matter (SIDM) is a simple and well motivated scenario that demonstrates great potential to solve small scale issues. One recent example is the diversity problem due to the failure of the lambda cold dark matter (LambdaCDM) paradigm to explain the diverse behavior in observed rotation curves, especially for dwarf galaxies. To address this issue in SIDM paradigm, we follow our previous work and fit 120 galaxy velocity rotation curves from SPARC dataset using SIDM model with a fixed value of self-interaction cross section and only assuming the halo concentration-mass relation predicted by the LambdaCDM model. Our result shows SIDM dramatically improves the ability to fit the rotation curve comparing to CDM. Discrepancy in halo masses corresponding to the same disk mass between result from fitting and expectation from abundance matching may indicate the "too-big-to-fail" problem still exist with current SIDM. Radial acceleration relation and baryonic Tully-Fisher relation are closely reproduced though with a bit large reasonable scatter. In addition, SIDM direct detection will be briefly discussed.

Speaker: Tao Ren (UC Riverside)

Slides ExplainDiversityinSpirals_DPF2017v3.pdf

10:45 AM → 12:15 PM Neutrino Physics: Tuesday morning

Convener: Prof. Sowjanya Gollapinni (University of Tennessee, Knoxville)

10:45 AM Current Analysis Status for the Inclusive Neutral Current π0 Production Cross section Measurement with the NOvA Near Detector

NOvA (NuMI Off-axis νe Appearance) experiment is designed to study long-baseline neutrino oscillations using two detectors, the Near Detector (ND) at Fermilab and the Far Detector (FD) at a distance 810 km in Northern Minnesota. NOvA looks for the νe appearance at the FD using a narrow band νμ beam peaked at 2 GeV in energy. Neutral Current (NC) interactions with a π0 in the final state represents the main background in the νe appearance measurement. The π0 decay into two photons can fake the νe appearance signal either due to merging of two photon showers or one of the two photons escaping the detection. Therefore, a complete understanding of νμ induced NC interactions with π0 in the final state is very important. It will also help in reducing the background uncertainties for current and future long-baseline neutrino oscillation experiments. We will present the current status of the analysis related to the inclusive NC π0 production cross section measurement with the NOvA ND.

Speaker: Ms Daisy Kalra (Student)

Slides DPF2017_NCPi0Analysis.pdf

11:03 AM Measurement of Neutral Current Coherent Pi0 Production In The NOvA Near Detector

The NOvA experiment is a long-baseline neutrino oscillation experiment designed to measure electron neutrino appearance in a muon neutrino beam. It consists of two finely segmented, liquid scintillator detectors at 14 mrad off-axis in the NuMI beam.The NOvA Near Detector, located at Fermilab, provides an excellent opportunity to study neutrino-nucleus interactions which are important for the neutrino oscillation measurements. This talk will present one of the first such measurements from the NOvA Near Detector: neutral current coherent-Pi0 production. Neutrinos can coherently interact with the target nucleus via neutral current exchange and produce a single, forward Pi0, which is a background to the NuE appearance measurement. This analysis measures the coherent-Pi0 kinematics and cross-section and compares it to the model predictions. A data-driven method is developed to constrain the neutral current resonance and deep-inelastic pi0 productions which are background to this analysis.

Speaker: Hongyue Duyang (university of south carolina)

Slides novacohpi0_17-08-01_v2.pdf

11:21 AM Measurement of Reconstructed Charged Particle Multiplicities of Neutrino Interactions in MicroBooNE

MicroBooNE is a liquid argon Time Projection Chamber experiment situated on the Booster Neutrino Beam at Fermilab that is designed to probe neutrino interactions, investigate non-standard neutrino oscillations, and further develop the LArTPC detector technology. In this talk, we compare the observed charged particle multiplicity distribution, which is produced via neutrino charged current interactions in the visible phase-space to predictions of this distribution from current generator models. The data used in this analysis were collected in 2015-2016 by MicroBooNE detector. The analysis employs a fully automatic event selection and charged particle track reconstruction and uses a novel data-driven technique to separate neutrino interactions from cosmic-induced backgrounds.

Speaker: Ms Aleena Rafique (Kansas State University)

Slides DPF_talk_08_01_17.pdf

11:39 AM Neutrino-Nucleus Deep Inelastic Scattering (DIS) results from MINERvA

Neutrino-Nucleus Deep Inelastic Scattering (DIS) events provide a probe into the structure of nucleons within a nucleus that cannot be accessed via charged lepton-nucleus interactions. The MINERvA experiment is stationed in the Neutrinos from the Main Injector (NuMI) beam line at Fermi National Accelerator Laboratory. With the recent increase in average neutrino energy and the greatly increased intensity of the NuMI beam line, projected sensitivities for DIS cross section ratio analyses using MINERvA's suite of nuclear targets (C, CH, Fe and Pb) will be greatly increased. The current state of the field and the projected reach and impacts of these measurements will be discussed.

Speaker: Mr Dipak Rimal (University of Florida)

Slides DR_APS_DPF_2017.pdf

11:57 AM Antineutrino to neutrino charged-current interaction cross section ratio in MINERvA

The neutrino and anti-neutrino charged-current inclusive cross sections are important ingredients for current and future neutrino oscillation experiments. MINERvA recently measured these cross sections on carbon, and their ratio, using data from the forward and reversed horn focusing modes of the Fermilab low-energy NuMI beamline. The flux prediction was obtained from a sample of charged-current events at low nuclear recoil energy ($\nu$) along with precise higher energy external neutrino cross section data overlapping our energy regime. Common systematic uncertainties cancel in the extracted antineutrino-neutrino cross section ratio and reaches a precision of 5$\%$ at low energy since we benefit from the fact that the cross-sections are obtained within the same experiment using the same technique. This talk will discuss these results.

Speaker: Dr Lu Ren (University of pittsburgh)

Slides LuRen_20170801_DPF_v4.pdf

10:45 AM → 12:15 PM Particle Detectors: Tuesday morning

Convener: corrinne mills (University of Illinois at Chicago)

10:45 AM The LUCID-2 detector

The LUCID-2 detector is the main online and offline luminosity provider of the ATLAS experiment. It provides over 100 different luminosity measurements from different algorithms for each of the 2808 LHC bunches. LUCID was entirely redesigned in preparation for LHC Run 2: both the detector and the electronics were upgraded in order to cope with the challenging conditions expected at the LHC center of mass energy of 13 TeV with only 25 ns bunch-spacing. While LUCID-1 used gas as a Cherenkov medium, the LUCID-2 detector is in a new unique way using the quartz windows of small photomultipliers as the Cherenkov medium. The main challenge for a luminometer is to keep the efficiency constant during years of data-taking. LUCID-2 is using an innovative calibration system based on radioactive 207 Bi sources deposited on the quartz window of the readout photomultipliers. This makes it possible to accurately monitor and control the gain of the photomultipliers so that the detector efficiency can be kept stable at a percent level. A description of the detector and its readout electronics will be given, as well as preliminary results on the ATLAS luminosity measurement and related systematic uncertainties.

Speaker: Prof. Pinfold James (University of ALberta)

Slides APS-2017-LUCID-Talk-V3.pdf

11:03 AM Performance of the ATLAS Tile Calorimeter in Run 2 and Electronics Upgrade for High Luminosity LHC

The Tile Calorimeter (TileCal) is the hadronic calorimeter covering the central region of the ATLAS experiment at the Large Hadron Collider (LHC). This talk is divided into two parts. The first part will present studies of the TileCal energy scale using in-situ E/p measurements conducted during Run 2 of the LHC. The second part will discuss the plans and current results of the program to upgrade the TileCal front-end electronics for the High Luminosity LHC (HL-LHC) Phase-II upgrade, scheduled for the mid-2020s. Specifically, the performance of prototype electronics currently being tested in an extensive program of test beam studies will be presented.

Speaker: Mr Joakim Olsson (University of Chicago)

Slides olsson_DPF2017_ATLAS_TileCal.pdf

11:21 AM Commissioning and operation of the new CMS Phase 1 pixel detector

The Phase I upgrade of the CMS pixel detector is built out of four barrel layers (BPIX) and three forward disks in each endcap (FPIX). It comprises a total of 124M pixel channels, in 1,856 modules and it is designed to withstand instantaneous luminosities of up to 2 x 10^34 cm-2 s-1. Different parts of the detector have been assembled over the last year and later brought to CERN for installation inside the CMS tracker. At various stages during the assembly tests have been performed to ensure that the readout and power electronics, and the cooling system meet the design specifications. After tests of the individual components, system tests have been performed before the installation inside CMS. In addition to reviewing these tests, we also present results from the final commissioning of the detector in-situ using the central CMS DAQ system. Finally we review results from the initial operation of the detector first with cosmic rays and then with pp collisions.

Speaker: Weinan Si (UC Riverside)

Slides WSi_DPF_1AUG2017.pdf

11:39 AM Construction of the Phase 1 upgrade of the CMS pixel detector

The innermost layers of the CMS tracker are built out of pixel detectors arranged in three barrel layers (BPIX) and two forward disks in each endcap (FPIX). The original CMS detector was designed for the nominal instantaneous LHC luminosity of 1 x 10^34 cm^-2 s^-1. Under the conditions expected in the coming years, which will see an increase of a factor two of the instantaneous luminosity, the CMS pixel detector will see a dynamic inefficiency caused by data losses due to buffer overflows. For this reason the CMS Collaboration has installed during the recent extended end of year shutdown a replacement pixel detector. The Phase I upgrade of the CMS pixel detector will operate at full efficiency at an instantaneous luminosity of 2 x 10^34 cm^-2 s^-1 with increased detector acceptance and additional redundancy for the tracking, while at the same time reducing the material budget. These goals are achieved using a new readout chip and modified powering and readout schemes, one additional tracking layer both in the barrel and in the disks, and new detector supports including a CO2 based evaporative cooling system, that contribute to the reduction of the material in the tracking volume. This contribution will review the design and technological choices of the Phase I detector, with a focus on the challenges and difficulties encountered, as well as the lessons learned for future upgrades.

Speaker: Maral Alyari (Fermilab)

Slides DPF_PIXEL1_08012017.pdf

11:57 AM The LHCb Upgrades

During the LHC Run-1 the LHCb experiment has successfully performed a large number of world’s class precision measurements in heavy flavour physics, and is now further increasing the datasets in Run-2. However, most of the LHCb measurements will remain limited by statistics. LHCb will therefore undergo a major upgrade in the Long Shutdown 2 (LS2) of LHC aimed at collecting an order of magnitude more data during Run-3 and Run-4. The upgrade consists of a new full readout at the LHC bunch crossing rate (40 MHz) with the ultimate flexibility of a pure software trigger. In order to increase the instantaneous luminosity up to 2x10ˆ33 cm-2s-1, several sub-detector upgrades are also underway, in order to cope with the expected higher occupancies and radiation dose. The architecture of the upgraded detector will be presented along with physics goals. Furthermore, the LHCb collaboration is planning a further upgrade to be installed during LS4 that aims at raising the instantaneous luminosity by another factor 10, in order to collect order of 300 fb-1 by the end of the Run-5. Conceptual design and physics reach will be also discussed.

Speaker: Matthew Rudolph (Syracuse University)

Slides mrudolph_lhcb_upgrade_dpf2017.pdf

10:45 AM → 12:15 PM Precision Electroweak Physics: Tuesday morning

Convener: Prof. Richard Hill (Perimeter Institute)

10:45 AM Monte Carlo Simulations of the PEN experiment: A Precision Measurement of $\pi\rightarrow$e$\nu(\gamma)$ Branching Ratio

The PEN collaboration performed a precision measurement of the $\pi^+\rightarrow e^+\nu_e(\gamma)$ branching ratio with the goal of obtaining a relative uncertainty of $5\times10^{-4}$ or better at the Paul Scherrer Institute. A precision measurement of the branching ratio $\Gamma(\pi\rightarrow e\bar{\nu}(\gamma))/\Gamma(\pi\rightarrow \mu \bar{\nu}(\gamma))$ can be used to give mass bounds on ``new'', or non V$-$A, particles and interactions. This ratio also proves to be one of the most sensitive tests for lepton universality. The PEN detector consists of beam counters, an active target, a mini-time projection chamber, cylindrical multi-wire proportional chambers, a plastic scintillating hodoscope, and a spherical 240-module pure CsI electromagnetic calorimeter. The Geant4 Monte Carlo simulation is used to construct ultra-realistic events by digitizing energies and times, creating synthetic target waveforms, and fully accounting for photo-electron statistics. We focus on the detailed detector response to signal and background processes in order to sharpen the discrimination between them in the data analysis.

Speaker: Mr Charles Glaser (University of Virginia)

11:10 AM Measurement of same-sign WW diboson production with the ATLAS experiment

We present a study of same-sign W±W± boson pairs produced in association with two or more jets in pp collisions at √s = 13 TeV. Same-sign W±W± production is sensitive to the mechanism of electroweak symmetry breaking and physics beyond the standard model, particularly through vector boson scattering (VBS) production. Unlike opposite-sign WW production, in same-sign W±W± production the electroweak mediated diagrams are comparable in size to the QCD mediated diagrams, making it well suited for VBS studies. An inclusive cross section measurement of both the electroweak and QCD same sign W±W± processes is performed using leptonically decaying W± bosons with electrons and/or muons in the final state. The first evidence of of same sign W±W± production was seen by the ATLAS collaboration in 20.3 fb^-1 of 8 TeV data, seeing an excess in data of 3.6σ over backgrounds. We expect greater sensitivity with the 36 fb^-1 of 13 TeV data collected by ATLAS in 2015 and 2016.

Speaker: Will DiClemente (University of Pennsylvania)

Slides ssww_aps_2017.pdf

11:35 AM Single W/Z boson production cross sections with the CMS detector

Measurements of single W and Z boson inclusive and differential production cross sections with the CMS detector are presented. Measurements of Drell-Yan cross sections in the mass range of 15 to 3000 GeV are also reported. The results are compared to predictions from different Monte Carlo generators.

Speaker: Jay Lawhorn (Caltech)

Slides 2017-08-01-lawhorn-cms-wz.pdf

10:45 AM → 12:15 PM QCD: Tuesday morning

Convener: Radja Boughezal (Argonne National Laboratory)

10:45 AM The proton radius puzzle

In 2010 the proton charge radius was extracted for the first time from muonic hydrogen, a bound state of a muon and a proton. The value obtained was five standard deviations away from the regular hydrogen extraction. Taken at face value, this might be an indication of a new force in nature coupling to muons, but not to electrons. It also forces to reexamine our understanding of the structure of the proton. In this talk I will describe an ongoing theoretical research effort that seeks to address and resolve this "proton radius puzzle". In particular, I will present a reevaluation of the proton structure effects, correcting 40 years of such calculations, and the development of new effective field theoretical tools that would allow to directly connect muonic hydrogen and muon-proton scattering.

Speaker: Prof. Gil Paz (Wayne State University)

Slides Paz_Proton_Radius_DPF_2017.pdf

11:03 AM On HQET and NRQCD Operators of Mass Dimension 8 and Above

Effective field theories such as Heavy Quark Effective Theory (HQET) and Non Relativistic Quantum Chromo-(Electro-) dynamics NRQCD (NRQED) are indispensable tools for controlling the effects of the strong interaction. The increasing experimental precision requires the knowledge of higher dimensional operators. These operators are important to the evaluation of decay rates of the B-meson. We present a general method that allows for an easy construction of HQET (NRQED and NRQCD) operators that contain two heavy quark (non-relativistic) fields and any number of covariant derivatives. As an application of our method, we give for the first time all such terms in the 1/M^4 NRQCD Lagrangian, where M is the mass of the spin-half field. We analyze the general dimension-nine spin-independent HQET matrix element, which was not considered so far in the literature, and calculate moments of the leading power shape function up to and including dimension nine HQET operators.

Speaker: Mr AYESH GUNAWARDANA (Wayne State University)

Slides Ayesh_Gunawardana__DPF_2017.pdf

11:21 AM Alternative Formulation of the z-Expansion in Semileptonic Decays

We propose an alternative method to perform the z expansion in the B→π l ν decay by using a rational expression that automatically satisfies the constraint imposed by the conservation of angular momentum. This avoids having to impose a constraint on the truncated series. The accuracy of the formulation was checked by fitting the lattice data in conjunction with the experimental data from Belle and BaBar. We discuss the accuracy of extrapolations based on fits of subregions of the kinematic range.

Speaker: Mr Erik Gustafson (University of Iowa)

Slides FermilabDPF_Presentation.pdf

11:39 AM Recent measurements of exclusive hadronic cross sections at BABAR and the implication for the muon g-2 calculation

The BABAR Collaboration has an intensive program studying hadronic cross sections in low-energy $e^+e^-$ annihilations, which are accessible with data taken near the Upsilon(4S) via initial-state radiation. Our measurements allow significant improvements in the precision of the predicted value of the muon anomalous magnetic moment. These improvements are necessary for shedding light on the current ~3 sigma difference between the predicted and the experimental values. We have previously published results on a number of processes with two to six hadrons in the final state. We report here on several recent measurements of hadronic cross sections in $e^+e^-$ annihilations.

Speaker: Dr David Brown (University of Louisville)

Slides DNB_g-2_DPF2017_v3.pdf

11:57 AM Regge Trajectories of triply heavy baryons

$\Omega_{ccc}$, $\Omega_{bbb}$, $\Omega_{ccb}$ and $\Omega_{bbc}$ baryons are considerable theoretical interest in a baryonic analogue of heavy quarkonium because of the color-singlet bound state of three heavy quark (c,b) combination inside ({\it free from light quarks}) \cite{olive}. Regge trajectories are concerned with the mass spectrum of the particles so that the present study exhibits the regge trajectories obtained from excited states of four experimentally unknown triply heavy $\Omega$ baryons. The trajectories are plotted in (n, $M^{2}$) and (J, $M^{2}$) planes which is helpful to determine the unknown quantum number and $J^P$ values. The calculations have computed in Hypercentral Constituent Quark Model with hyper coulomb plus linear potential \cite{EPJC}. Many author have also study the mass spectra by different approaches\cite{brown, PAD2014, vijande2015, kwei2}. However, LHCb experiment possibly detect $\Omega_{bbb}$, $\Omega_{bbc}$ and $\Omega_{bbc}^{*}$ baryons at appropriate integrated luminosity and collision energy \cite{lhcb}. \begin{thebibliography}{90} \bibitem{olive}{C. Patrignani et. al., Chin. Phys. C \textbf{40}, 100001 (2016)}. \bibitem{kwei2}K-W Wei, B. Chen and X-H Guo, Phys. Rev. D \textbf{92}, 076008 (2015). \bibitem{EPJC}Z. Shah, K. Thakkar and A. K. Rai, Eur. Phys. J. C {\bf76}, 530 (2016); Eur. Phys. J. C {\bf77}, 129 (2017);Chin. Phys. C \textbf{40}, 123102 (2016). \bibitem{brown}Z. S. Brown, W. Detmold, S. Meinel, and K. Orginos, Phys. Rev. D \textbf{90}, 094507 (2014) \bibitem{PAD2014} M. Padmanath, R. G. Edwards, N. Mathur, and M. Peardon, Phys. Rev. D \textbf{90}, 074504 (2014) \bibitem{vijande2015} J. Vijande, A. Valcarce and H. Garcilazo, Phys. Rev. D \textbf{91}, 054011 (2015). \bibitem{lhcb}S.-Z. Wu, Y.-W. Li and R. Rashidin, Phys. Rev. D {\bf 86}, 114504 (2012) \end{thebibliography}

Speakers: Dr Ajaykumar Rai (Assistant Professor), Mrs Zalak Shah (PhD student)

10:45 AM → 12:15 PM Quark and Lepton Flavor: Tuesday morning

Convener: Prof. Alexey Petrov (Wayne State University / MCTP)

10:45 AM Exotic multiquark states in pp̄ collisions at D0

We use the full Run II dataset consisting of 10.4 fb −1 of pp̄ collisions recorded by the D0 detector at the Fermilab Tevatron collider at sqrt s = 1.96 TeV to search for new exotic multiquark states. We report the evidence of a new state X(5568) decaying to Bsπ seen in the Bs → J/ψφ decay channel and its independent confirmation in the semi-leptonic channel Bs → μ± Ds∓ X. We also report on the search for other exotic states.

Speaker: Peter Garbincius (Fermilab)

Slides PHG_D0_Exotics_DPF_2017_v2.pdf

11:03 AM Heavy hadron spectroscopy at LHCb

We report on the first observation of excited hadronic states in both the charm and beauty sector with special emphasis on the observation of five excited Omega_c states. Similar techniques are used to search the LHCb data for states observed in other datasets, such as the tetraquark state X(5568) whose evidence was reported by D0.

Speaker: Dr Ivan Polyakov (CERN)

Slides DPF_Polyakov_v2.pdf

11:21 AM Pentaquark & tetraquark states at LHCb

The observation of two pentaquark resonances and the proof of the resonant nature of the Zc state opened to the search for the many isospin partner of these multi-quark states. We review the studies of these states and discuss the prospects for the analyses of the LHCb Run2 data.

Speaker: Dr Liming Zhang (Tsinghua University)

Slides DPF-Liming.pdf

11:39 AM Beauty-full Tetraquarks

Non-relativistic two-body heavy quark system has been proved to be very useful to understand the QCD dynamics. Extending it to many-body heavy quark system may not just provide a new and interesting tetraquark state, but also helps us to understand QCD more. In this talk, I will discuss a way to calculate the ground-state energy of a tetraquark of four beauty quarks, which can behave as a Y(1S)Y*(1S) resonance.

Speaker: Dr Yang Bai (University of Wisconsin-Madison)

Slides Tetraquark_YangBai.pdf

11:57 AM Thomas-Fermi quark model for mesons

The first results of a new application of the Thomas-Fermi statistical quark model to mesonic states will be presented. Interesting aspects of the theory will be discussed, distinguishing such states from baryonic matter. A major motivation of this study is the tetraquark states discovered at the LHC and the possibility that stable multi-quark families of such states exist. Similar to the previous baryonic study, we use a two-inequivalent wavefunction approach to investigate aspects of many-meson matter. We think of our model as a tool for quickly assessing the characteristics of new, possibly bound, particle states of higher quark number content, which cannot yet be examined by lattice methods.

Speaker: Suman Baral (Baylor University)

10:45 AM → 12:15 PM Top Quark Physics: Tuesday morning

Convener: Reinhard Schwienhorst (Michigan State University)

10:45 AM Direct measurement of the top quark mass in $p\bar p$ collisions at D0

We report the most recent measurements of the mass of the the top quark, performed by the D0 experiment at the Fermilab Tevatron collider using the full Run II (2001--2011) data set corresponding to an integrated luminosity of $9.7\ $fb$^{-1}$. This includes measurements in the dilepton channels using the matrix element and neutrino weighting approaches, as well as measurements in the lepton+jets channel using the matrix element method. We also discuss the final D0 combination and the preliminary D0+CDF combination of the top quark mass using Run I (1992--1996) and Run II measurements.

Speaker: Gregorio Bernardi (LPNHE Paris)

Slides DPF-D0-mass-2017.pdf

11:00 AM Measurement of the pole mass of the top quark using pp̄ → tt̄ production cross sections at D0

We present an alternative approach to the direct measurements of the top quark mass using D0 data. We discuss extractions of the pole mass of the top quark based on measurements of the inclusive and unfolded differential pp̄ → tt̄ production cross section as a function of p T (t) and tt̄ mass.. We use the full Run II data set of pp̄ collisions collected by the D0 experiment, corresponding to an integrated luminosity of 9.7 fb −1 .

Speaker: Andreas Jung (Fermilab)

Slides DPF_poleMass_ajung_v2.pdf

11:15 AM P5' anomaly for top: tZ' associated production at LHC

The LHCb experiment uncovered the P5' anomaly, a deviation in data from Standard Model expectations in the said B -> K*mumu angular observable. This has motivated a possible Z' boson that couples to left-handed b to s transitions, where a model would be the gauged L_mu - L_tau symmetry, but direct search for such a Z' is not promising. Less constrained is a similar Z', but coupling to right-handed t to c transitions. Motivated by this, we study cg -> tZ' associated production at LHC, both for a generic model, and in the L_mu - L_tau with a vector-like U quark as its realization. We also study cc(bar) -> Z' production that would exist within the model. Both processes can be probed already by LHC Run 2 data, all the way up to the HL-LHC.

Speaker: Prof. George W.S. Hou (National Taiwan University)

Slides towards_tZ'.pdf

11:30 AM A Boosted Event Shape Tagger for Heavy Object Classification

We present a novel approach to the problem of discriminating jets produced from the hadronic decays of highly-boosted heavy particles (top, W, Z, H) from light jets. By hypothesizing different particle origins for the jets and boosting all jet constituents into the corresponding rest frames, angular and kinematic distributions of reconstructed particles can be used to discriminate 2- or 3-prong topologies from those of light jets produced in QCD processes. Machine learning techniques are utilized to build discriminants capable of simultaneously separating and classifying the particle species. This approach adds additional information relative to existing techniques, thereby improving sensitivities of analyses dependent on such heavy-object tagging tools. We demonstrate the performance of this tagging method and provide a proof-of-principle application to a simple analysis scenario.

Speaker: Justin Pilot (University of California, Davis)

Slides JPilot_DPF2017.pdf

11:45 AM Toward Precision Top Quark Measurements in e+e- collisions

This talk will review new developments toward precision top quark measurements at e+e- colliders, including improvements in the experimental strategies for top quark pair production in the continuum, improvements in the precision theoretical understanding of this process, and sensitivity to new physics models. It will also update the study of the precision measurement of the t-tbar threshold.

Speaker: Prof. Hitoshi Yamamoto (Tohoku University)

Slides Top_LC-DPF17.pptx

12:15 PM → 1:30 PM Lunch

12:30 PM → 1:15 PM Meetings with DOE Representatives: Intensity Frontier

Convener: Glen Crawford (US Dept of Energy)

12:30 PM Intensity Frontier

Speaker: Dr Michael Cooke (U.S. Department of Energy)

Slides 2017-08-01_DPF_2017_-_Intensity_Frontier_v7.pdf

1:30 PM → 3:15 PM Beyond Standard Model: Tuesday afternoon

Convener: Prof. Robin Erbacher Erbacher (UC Davis)

1:30 PM Search for pair production of vector-like quarks in final states with a boosted W boson and b-jet with the ATLAS experiment

This talk will present a search for the pair production of heavy vector-like $T$ and $B$ quarks, primarily targeting $T$ quark decays to a $W$ boson and a $b$ quark. The search is based on 36 fb$^{−1 }$ of $pp$ collisions at $\sqrt{s} = 13$ TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analyzed in the lepton plus jets final state, including at least one $b$-tagged jet and a large-radius jet identified as originating from the hadronic decay of a high-momentum $W$ boson.

Speaker: Prof. Joseph Haley (Oklahoma State University)

Slides Haley_WbX_final.pdf

1:46 PM Search for electroweak production of a vectorlike quark decaying to a top quark and a Higgs or Z boson using boosted topologies in an all-hadronic final state

We present a search for the electroweak production of a vector-like top quark partner T of charge + 2/3 in association with a standard model top or bottom quark, using proton-proton collision data at √s=13 TeV collected by the CMS Experiment at the CERN LHC. Our search targets T quarks decaying to a top quark and a Higgs or Z boson in a fully hadronic final state. For a T quark with mass above 1 TeV the daughter top quark and Higgs/Z boson are highly Lorentz-boosted and can appear together as a single hadronic jet. The top quark and Higgs/Z boson are identified using b-tagging and jet substructure techniques, which also acts to suppress the standard model backgrounds.

Speaker: Erich Schmitz (University of Kansas)

Slides DPF2017_Schmitz_1Aug17_v4.pdf

2:02 PM Search for low mass dijet resonances in association with ISR at the ATLAS experiment

A search for low mass resonances decaying to a jet pair in association with an ISR jet or photon in the context of a dark matter mediator. The ISR object acts as the event trigger, and the resonance jet pair is subsequently boosted and reconstructed as a large-radius jet. Novel jet substructure techniques allow for signal jets to be selected over the dominant QCD background. The search uses 36 fb of pp collision data at a center-of-mass energy of 13 TeV collected in 2015 and 2016 by the ATLAS detector at the LHC. Resonances are searched for in the mass range of 100-250 GeV, using a leptophobic Z' benchmark model.

Speaker: Laser Kaplan (University of Wisconsin-Madison)

Slides laser_dijetISR_dpf2017.pdf

2:18 PM Search for light vector resonances decaying to a quark pair produced in association with a jet with the CMS detector at 13 TeV

We perform a search for light generic dijet resonances produced in association with a high transverse momentum jet to get above trigger thresholds. It uses novel jet substructure observables to identify the Z' signal. The signal is then extracted on top of a falling QCD soft drop mass distribution estimated with a novel data-driven technique. Results are presented in a mass-coupling phase space and are the most sensitive to date, extending previous limits below 100 GeV.

Speaker: Cristina Ana Mantilla Suarez (Fermilab)

Slides CMS_EXO17001_DPF2017.pdf

2:30 PM Search for paired dijet resonances in the boosted and non-boosted regime with the CMS detector at 13 TeV

We present a search for paired dijet resonances using data from proton-proton collisions at a center-of-mass energy of 13 TeV, recorded in 2016 by the CMS detector at the LHC. We exploit jet substructure techniques to reach low mass boosted paired dijet resonances, while for higher resonance masses we search for four jets in the final state. We consider the pair production of top squarks (stops) as the benchmark model, where each stop decays through the hadronic R-parity violating (RPV) coupling; in the case of the UDD312 coupling the stops decay into two light quarks and, for the UDD323 coupling the stops decay into a light quark and a b-quark.

Speaker: Alejandro Gomez Espinosa (Rutgers, The State University of New Jersey)

Slides CMSBoostedPairedDijets_DPF2017_20170801_v2.pdf

2:46 PM Searches for new heavy resonances in final states with leptons, photons, and jets in CMS

Many new physics models beyond the Standard Model predict the existence of narrow or broad resonances decaying to a pair of quarks/gluons, leptons, or photons. At the LHC, the production of heavy resonances decaying into a pair of particles can be probed at unprecedented centre-of-mass energies. This talk presents CMS searches for new resonances in the diet, dilepton, diphoton, and other final states that include leptons and photons, focusing on the recent results obtained using data collected during the 2016 run.

Speaker: Norbert Neumeister (Purdue University)

Slides Norbert_DPF.pdf

3:02 PM Search for diphoton high-mass resonances with 36.7 fb−1 of data collected at √ s=13 TeV with the ATLAS experiment

A search for heavy resonances decaying into two photons in the ATLAS experiment is presented. The analysis uses proton-proton collision data accumulated at the Large Hadron Collider during 2015 and 2016 with a corresponding luminosity of 36.7 fb^{-1} at 13 TeV. Two searches are shown, a search for spin-0 particles using a heavy Higgs-like particle as a benchmark model, and a search for spin-2 particles using a Randall-Sundrum graviton as a benchmark model. Limits on the production cross section times branching ratio to two photons for the two resonance types are reported.

Speaker: Mr Manuel Silva (University of Wisconsin, Madison)

Slides DPF_Manuel_Silva.pdf

1:30 PM → 3:15 PM Computing, Analysis Tools, and Data Handling: Tuesday afternoon

Convener: Aristeidis Tsaris (Fermilab)

1:30 PM Deep Neural Networks for HEP Images

Deep neural networks (DNNs) have revolutionized many areas of science and technology. In this talk, we will discuss cutting edge developments in DNNs for high energy physics, using jet physics (including calorimeter showers) as an example that has attracted significant recent attention. Domain specific challenges require new techniques to make full use of the algorithms. A key focus is on understanding how and what the algorithms learn. DNN techniques are demonstrated for classification, regression, and generation. In addition to providing powerful baseline performance, we show how to train complex models directly on data and to generate sparse stacked images with non-uniform granularity.

Speaker: Benjamin Nachman (LBNL)

Slides Nachman_DNNsForHEPImages_DPF.pdf

1:55 PM Applying Deep Learning in MicroBooNE

Deep learning algorithms, which have emerged over the last decade, are opening up new ways to analyze data for many particle physics experiments. The MicroBooNE experiment, which is a neutrino experiment at Fermilab, has been exploring the use of such algorithms, in particular convolutional neural networks (CNNS). CNNs are the state-of-the-art method for a large class of problems requiring the analysis of image data. This makes CNNs an attractive approach as the MicroBooNE detector is a liquid argon time projection chamber, which produces high-resolution images of particle interactions. In this talk, I will discuss the ways CNNs can be applied to tasks like neutrino interaction detection and particle identification in MicroBooNE.

Speaker: Taritree Wongjirad (MIT)

Slides 2017_08_01_DPF_CNNsInUBooNE.pdf

2:20 PM Deep Learning and DUNE

The observation of neutrino oscillations provides evidence of physics beyond the standard model, and the precise measurement of those oscillations remains an important goal for the field of particle physics. The planned DUNE experiment is set to become a leading experiment in the study of neutrino oscillations. Taking advantage of a two-detector technique, a tightly focused beam at Fermilab, and a far detector based on cutting edge Liquid Argon Time Projection chamber technology, DUNE will in a prime position to deliver precision measurements of the neutrino mass hierarchy, and CP violation. A key part of the delivery of those precision measurement will be the accurate identification and reconstruction of neutrino interactions in the DUNE far detector. Liquid Argon Time Projection chambers are rich sources of physical information, offering the equivalent of incredibly high resolution “images” of the particles produced in neutrino interactions. Conventional reconstruction tools have so far struggled to fully exploit the promise of that rich source of information, particularly compared to expert human event scanners. This talk will describe a variety of novel ways in which cutting edge deep learning tools are being explored to aid both event reconstruction and selection in DUNE detector simulations.

Speaker: Dr Alexander Radovic (College of William and Mary)

Slides DUNE_DL_DPF_RADOVIC.pdf

2:45 PM Advanced machine-learning solutions in LHCb operations and data analysis

The LHCb detector is a forward spectrometer optimized for the reconstruction of charm- and bottom-hadron decays in LHC’s proton-proton collisions. The need to process large amounts of data within the constraints of the data-acquisition and offline-computing resources pushes steadily toward usage of advanced data-analysis techniques. Currently, LHCb takes data at rates significantly higher than the design values, thanks also to purpose-developed machine-learning (ML) solutions. Such soliutions are applied to an increasing class of essential online and offline tasks, including more precise and faster real-time classification of interesting events, smarter detector-performance calibrations, and more precise, efficient, and unbiased offline characterization of reconstructed events. This talk overviews recent original ML applications in the trigger, operations, and analysis of LHCb data in 2015-2016 and discusses ongoing and future developments.

Speaker: Dr Fedor Ratnikov (YSDA)

Slides DPF2017.pdf

1:30 PM → 3:15 PM Cosmology and Astrophysics: Tuesday afternoon

Convener: Dr Bradford Benson (Fermilab)

1:30 PM News from BICEP/Keck Array CMB program

The BICEP/Keck Array program comprises a series of telescopes at the South Pole designed to make deep measurements of cosmic microwave background polarization at degree angular scales on a 1% patch of sky. This talk will describe the latest science results from the program, including constraints on inflation, axion-like particles and primordial magnetic fields, as well as a high-significance detection of gravitational lensing. These results were derived using various combinations of 150GHz and 95GHz data collected by the BICEP/Keck receivers through 2014, and multi-frequency data from Planck and WMAP. The talk will also preview imminent science results that include one year of 220GHz data from BICEP/Keck. Finally, we will share plans for BICEP Array, the Stage 3 expansion of the BICEP/Keck program.

Speaker: Zeeshan Ahmed (SLAC National Accelerator Laboratory)

Slides 20170801DPFAhmed.pdf

1:50 PM The ACTPol and Advanced ACTPol Experiments

ACTPol and Advanced ACTPol are a series of cameras deployed on the Atacama Cosmology Telescope (ACT) and used to map the temperature and polarization of the cosmic microwave background (CMB) in multiple frequency bands and with arc minute resolution. Survey operations began in 2013 with a sky coverage of hundreds of square degrees in the 150 GHz band. Over the past five years we have upgraded the instrument and expanded the sky coverage. Beginning in 2016 we have been undertaking a wide survey covering 14,000 square degrees with sensitivity in the 90, 150, and 220 GHz bands. These data have been used to make measurements of CMB polarization, CMB lensing, and cross-correlations between these maps and observations at other wavelengths. In this presentation I given an overview of these experiments, our published results to date, and provide a preview of the science which will come out of the Advanced ACTPol data set for which analysis is ongoing.

Speaker: Dr Jeff McMahon (University of Michigan)

Slides DPF_McMahon.pdf

2:10 PM Recent progress from the SPT-3G experiment

The South Pole Telescope is a millimeter-wavelength telescope dedicated to observations of the Cosmic Microwave Background (CMB). In late 2016, the telescope was upgraded with new receiver known as SPT-3G. The SPT-3G receiver contains a focal plane of approximately 16,000 polarization-sensitive superconducting detectors distributed between three frequency bands. SPT-3G will survey the sky for four years, resulting in extremely deep, high-resolution maps of the polarization of the CMB. With these data, SPT-3G has the potential to constrain inflationary gravitational waves as well as the effect of massive neutrinos on large-scale structure formation. I will describe some of the technological advances enabling the large-format SPT-3G focal plane as well as the current instrument status and cosmological forecasts.

Speaker: Dr Amy Bender (Argonne National Laboratory)

Slides dpf_anb_20170801.pdf

2:30 PM Cosmology from CMB Polarization with POLARBEAR and the Simons Array

POLARBEAR is a cosmic microwave background (CMB) polarization experiment located in the Atacama desert in Chile. The science goals of the POLARBEAR project are to do a deep search for CMB B-mode polarization created by inflationary gravitational waves, as well as characterize the CMB B-mode signal from gravitational lensing. Gravitational lensing of large-scale structure creates B-mode polarization on arcminute scales, and surveys of this signal can be used to constrain the sum of the neutrino masses. POLARBEAR-1 started observations in 2012, and the POLARBEAR team has published a series of results from its first season of observations, including the first measurement of a non-zero B-mode polarization angular power spectrum. Recently, we released an improved measurement of the B-mode polarization power spectrum, reducing our uncertainties by a factor of two, by adding new data from our second observing season and re-analyzing the combined data set. To further improve on these measurements, POLARBEAR is expanding to include an additional two telescopes with dichroic receivers covering 95, 150, 220, and 270 GHz, known as POLARBEAR-2/Simons Array. With high sensitivity and large sky coverage, the Simons Array will create a detailed survey of B-mode polarization, and its spectral information will be used to extract the CMB signal from astrophysical foregrounds. We will present the latest POLARBEAR results, as well as the status of development of the Simons Array and its expected capabilities.

Speaker: Dr Darcy Barron (UC Berkeley / LBNL)

Slides Barron_APS_DPF_August2017.pdf

2:50 PM The Simons Observatory: Cosmology and Fundamental Physics from the Cosmic Microwave Background

The Simons Observatory (SO) is a next generation observatory optimized to make precise measurements of the comic microwave background (CMB) over frequencies spanning 30-300 GHz. The observatory will be built with a combination of 6 meter class and 1 meter class telescopes and up to 40,000 detector focal-plane arrays to make high fidelity maps over degree to arc-minute angular scales. These data will be used to detect or place stringent limits on primordial gravitational waves, new light relativistic species, neutrino properties, and to make many other astrophysical and cosmological measurements. The SO instrument will be a stepping stone to CMB-S4 which will field hundreds of thousands of CMB detectors across multiple telescope platforms. We will present the status of the design development for the large- and small-aperture SO telescopes, the cryogenic receivers, cold optical elements, and our plan for fielding and reading out tens of thousands of multichroic, superconducting detectors.

Speaker: Prof. Adrian Lee (University of California, Berkeley)

Slides 2017.07.30.DPF.Adrian_Simons_Observatory.pdf

1:30 PM → 3:15 PM Dark Matter: Tuesday afternoon

Convener: Prof. Enectali Figueroa-Feliciano (Northwestern University)

1:30 PM Search for new physics phenomena using events with missing transverse momentum and a Higgs boson decaying into two photons at sqrt(s) = 13 TeV with the ATLAS experiment

A search for new physics phenomena is presented using events with missing transverse momentum and a Standard Model Higgs boson decaying into two photons. This search is based on 13 TeV proton-proton collision data collected by the ATLAS detector at the LHC in 2015 and 2016, corresponding to an integrated luminosity of 36.1 $fb^{−1}$. No significant excess over the Standard Model expectation is observed. Upper limits at 95% confidence level on the production cross section times the branch ratio of the Higgs boson decaying into two photons are set for two Dark Matter models and a heavy scalar boson model. Additionally, the results are interpreted in terms of 90% confidence level limits on the dark matter-nucleon scattering cross section, as well as 95% confidence level limits on visible cross section.

Speaker: Dr Chen Zhou (University of Wisconsin-Madison)

Slides chen_20170718.pdf

1:45 PM Search for Dark Matter Produced in Association with a Higgs Boson Decaying to bb at sqrt(s) = 13 TeV with the ATLAS Experiment

Several extensions of standard model predict dark matter production in association with a Higgs boson. In this talk the results of a search for such models in final states with large missing transverse momentum and a Higgs boson decaying to $b\bar{b}$ will be presented. The search is performed with the ATLAS detector using 36 fb-1 of pp collisions at a center-of-mass energy of 13 TeV at the LHC. The results are interpreted in the context of a Dark Matter model and without extra model assumptions.

Speaker: Mr Efe Yigitbasi (Boston University)

Slides EfeYigitbasi_DPF2017_monoH(bb).pdf

2:00 PM Search for dark matter produced in association with a hadronically decaying vector boson at the ATLAS experiment

A search for dark matter particles produced in association with a hadronically decaying W or Z boson with the ATLAS experiment at the LHC is reported. The search uses data corresponding to an integrated luminosity of 36.1/fb in proton-proton collisions at a centre-of-mass energy (√s) of 13 TeV. No significant excess over the Standard Model prediction is observed. The search results are interpreted in terms of an effective field theory and a simplified vetor-mediator model describing dark matter interactions with Standard Model particles.

Speaker: Mr Yicheng Guo (University of Michigan; University of Science and Technology of China)

Slides 2017_July_DPF.pdf

2:15 PM Search for invisible decay of a dark photon produced in $e^+e^-$ collisions at BaBar

We report on a search for single-photon events in 53 $fb^{-1} of $e^+e^- $ collision data collected with the BaBar detector at the PEP-II $B$-factory. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with production of a spin-1 particle $A’$ through the process $e^+e^- \to \gamma A’$, $A’ \to invisible$. Such particles, referred to as “dark photons”, are motivated by theories applying a $U(1)$ gauge symmetry to dark matter. We find no evidence for such processes and set 90\% confidence level upper limits on the coupling strength of $A’ \to e^+e^-$ for a dark photon with a mass lower than 8 GeV. In particular, our limits exclude the values of the $A’$ coupling suggested by the dark-photon interpretation of the muon (g-2) anomaly, as well as a broad range of parameters.

Speaker: Dr Tomonari Miyashita (California Institute of Technology)

Slides Miyashita.pdf

2:30 PM Search for muonic dark force at BABAR

Many models of New Physics postulate the existence new gauge bosons mediating interactions between “dark sectors” and the Standard Model. We present a search for a dark boson Z' coupling only to the second and third generation of leptons in the reaction e+e- -> mu+mu-Z', Z' -> mu+mu- with the full BABAR dataset. No significant signal is observed and limits improving upon bounds derived from neutrino experiments are set.

Speaker: Bertrand Echenard (Caltech)

Slides BABAR2.pdf

2:45 PM An Indirect Search for Weakly Interacting Massive Particles in the Sun Using Upward-Going Muons in NOvA

We present the status of the a dark matter search using a dataset collected with an upward-going muon trigger at NOvA. Weakly Interactive Massive Particles are a theoretical potential non-baryonic form of Dark Matter. The nature of Dark Matter is one of the most interesting open questions in modern physics. Evidence for DM existence comes from cosmological observations but the discovery has not been made yet. If we assume that DM particles can produce Standard Model particles through their interactions, indirect searches can help shed light on this mystery. The NOvA collaboration has constructed a 14,000 ton, fine-grained, low-Z, total absorption tracking calorimeter. This detector, with its excellent granularity and energy resolution and relatively low-energy neutrino thresholds, is designed to observe electron neutrino appearance in a muon neutrino beam: but it also has unique capabilities suitable for more exotic measurements. In fact, with an efficient upward-going muon trigger and sufficient background suppression offline, NOvA will be capable of a competitive indirect dark matter search for low-mass WIMPs. To avoid the downward-going cosmic-ray muon background, we use only upward-going muons that point to the Sun. So, the search occurs at night when the Sun is on the other side of the Earth. This also allows us to use the time when the Sun is above the horizon as a control region to estimate the background. The goal is to select a sample of neutrino-induced upward-going muons and perform a competitive dark matter search.

Speaker: Cristiana Principato (University of Virginia)

Slides DPF_preliminary_principato.pdf

3:00 PM The Potential of the ILC for Discovering New Particles

The LHC did not discover new particles beyond the Standard Model Higgs boson at 7 and 8 TeV, or in the first data samples at 13 TeV. However, the complementary nature of physics with e+e- collisions still offers many interesting scenarios in which new particles can be discovered at the ILC. These scenarios take advantage of the capability of e+e- collisions to observe particles with missing energy and small mass differences, to observe mono-photon events with precisely controlled backgrounds, and to observe the full range of exotic decay modes of the Higgs boson. The searches that an e+e- collider makes possible are particularly important for models of dark matter involving a dark sector with particles of 10--100 GeV mass. In this talk, we will review the opportunities that the ILC offers for new particle discovery.

Speaker: Prof. Howard Baer (University of Oklahoma)

Slides dpf2017.pdf

1:30 PM → 3:15 PM Higgs and EWSB: Tuesday afternoon

Convener: Laura Reina (Florida State University)

1:30 PM Soft Gluon Resummation at NNLL Accuracy for Associated $t\bar{t}H$ Production at the LHC

The $t\bar{t}H$ production process probes the top-Higgs Yukawa coupling directly which is especially sensitive to the underlying physics. The measurement of the $pp \to t\bar{t}H$ cross section is among the highest priorities of the current LHC physics program and improvement of the theoretical accuracy is of the central importance. In this talk the latest results for soft gluon resummation at fixed invariant mass for $pp \to t\bar{t}H$ will be presented. The resummation is extended to next-to-next-to-leading logarithmic accuracy. The invariant mass resummation results will be presented in the form of the inclusive cross section and the invariant mass distribution, including scale uncertainty.

Speaker: Vincent Theeuwes (SUNY, Buffalo)

Slides VTheeuwes-DPF-ttH.pdf

2:00 PM Search for production of a Higgs boson and a single top quark

We present recent results from searches for the production of a Higgs boson in association with a single top quark (tHq), using data samples collected by the CMS detector in pp collisions at center-of-mass energy of 13 TeV, using data samples with integrated luminosity of up to 35.9 fb-1. The searches exploit a variety of top quark and Higgs boson decay modes resulting in final states with photons, bottom quarks, or multileptons, and employ a variety of multivariate techniques to maximize the sensitivity to the signal. Due to interference between the two main leading-order diagrams, the tHq process is sensitive to the relative sign of the couplings of the Higgs to the top quark and the vector bosons, and thus provides unique information on Higgs boson properties.

Speaker: Ken Bloom (University of Nebraska-Lincoln)

Slides thq_dpf_170801.pdf

2:20 PM Search for the Higgs boson production in association with top quarks at \sqrt{s} = 13 TeV with the ATLAS detector

The observation of the Higgs boson production in association with top quarks (ttH) is of particular importance, as it will be a direct evidence of the top Higgs Yukawa coupling. Further measurements of this process may be sensitive to potential new physics beyond the Standard Model, due to the large value of the top Yukawa coupling. I present searches for this production mode using ATLAS data taken in 2015 and 2016 at a center-of-mass energy of 13 TeV, with a focus on the analyses of diphoton and bbbar final states.

Slides HAICHEN_WANG_DPF.pdf

2:40 PM Search for ttH production in multilepton final states using the ATLAS experiment at the LHC

The search for Higgs boson production in association with two top quarks allows the direct measurement of Higgs boson- top quark Yukawa coupling. In this talk, results from the measurement of $t\bar{t}H$ production decaying into multilepton final states are presented. This search uses 36 fb$^{-1}$ of proton-proton collision data collected by the ATLAS experiment at the center-of-mass energy of 13 TeV in 2015 and 2016. The analysis is most sensitive to $H\to WW$, $H\to ZZ$ and $H\to \tau \tau$ decay modes.

Speaker: Mr Harish Potti (University of Texas at Austin)

Slides Harish_DPF_ttH.pdf

3:00 PM Search for production of a Higgs boson and a top quark pair at CMS

The discovery of a Higgs particle made by the CMS and ATLAS experiments at the Large Hadron Collider in 2012 was heralded as a significant advancement in our understanding of the fundamental world. In the post-discovery era, the task turned to characterizing this Higgs boson: to determine whether it is the particle predicted within the context of the standard model (SM) of particle physics – or is something altogether different. Essentially all measurements have thus far indicated that this Higgs boson is consistent with the predictions of the SM. However, one of the crucial characteristics that remains to be measured is the coupling strength between the Higgs boson and the top quark. The best opportunity for this measurement comes through the observation of production of a Higgs boson in association with a top quark pair (ttH production). In this talk, the status of the ttH campaign at CMS will be summarized covering results in all of the accessible decay channels.

Speaker: Mr Evan Wolfe (University of Virginia)

Slides ttH_Hbb_DPF2017.pdf

1:30 PM → 3:15 PM Neutrino Physics: Tuesday afternoon

Convener: Dr Minerba Betancourt (Fermilab)

1:30 PM Nuclear Dependence of Quasi-Elastic Scattering at MINERvA

A precise understanding of quasi-elastic interactions is crucial to measure neutrino oscillations. Current neutrino oscillation experiments use different targets that range from carbon to argon. A sample of neutrino interactions on Fe, Pb, C and CH with one muon and at least one proton candidate is used to study quasielastic-like interactions and the role that the nuclear environment plays in modifying those interactions. Measurements of differential cross sections and ratios of Fe, Pb and C to scintillator are presented as a function of four-momentum transferred to the target nucleus, where the momentum transferred is reconstructed using proton kinematics. Comparisons of these measurements with the predictions from the GENIE and NuWro event generators will be shown.

Speaker: Prof. Aaron Bercellie (Rochester University)

Slides Nuclear_CCQE_DPF_2017.pdf

1:48 PM Recent MINERvA Double Differential CCQE Cross Section Results Using Lepton Kinematics

MINERvA’s first CCQE results preferred models with 2p2h-like enhancements. Since then work using an inclusive sample measuring reconstructed available energy and three momentum transfer has demonstrated the effect of adding in RPA and 2p2h components to our base GENIE simulation. Further modification via a fit to the inclusive data results in an empirical model which well describes the full two dimensional cross sections in lepton variables, transverse and longitudinal momentum, for both the neutrino and anti-neutrino cases. These cross section results will be compared to this new model as well as other models.

Speaker: Prof. Jeffrey Kleykamp (Rochester University)

Slides Kleykamp_DPF_2017_v2.pdf

2:06 PM Status of an Alternative Measurement of the Inclusive Muon Neutrino Charged-current Cross Section in the NOvA Near Detector

NOvA is a long-baseline neutrino oscillation experiment. It uses the NuMI beam from Fermilab and two sampling calorimeter detectors off-axis from the beam. The 293 ton Near Detector measures the unoscillated neutrino energy spectrum, which can be used to predict the neutrino energy spectrum at the 14 kton Far Detector at Ash River, MN. The Near Detector also provides an excellent opportunity to measure cross sections with high statistics, which benefit current and future long-baseline neutrino oscillation experiments. This analysis implements new algorithms to identify $\nu_{\mu}$ charge-current events by using visual deep learning tools such as convolutional neural networks. In this talk we present the status of a measurement of the inclusive $\nu_{\mu}$ CC cross section in the NOvA Near Detector.

Speaker: Mr Biswaranjan Behera (IIT Hyderabad/Fermilab)

Slides NumuXSec.pdf

2:24 PM Status of the Charged Pion Semi-Inclusive Neutrino Charged-Current Cross Section in NOvA

The NOvA experiment is a long-baseline neutrino oscillation experiment designed to measure the rates of electron neutrino appearance and muon neutrino disappearance. The NOvA near detector is located at Fermilab, 800 m from the primary target and provides an excellent platform to measure and study neutrino-nucleus interactions.We present the status of the measurement of the double differential cross section with respect to muon kinematics for interactions involving charged pions in the final state, νμ+N → N +μ±π∓X.We have derived a convolutional neural network-based approach for the identification of neutrino interactions with the specific final state topology. We present event classification efficiency studies using this particle identification and classification methodology, along with systematic uncertainties, background estimates and prospects for the measurement.

Speaker: Mr Aristeidis Tsaris (Fermilab)

Slides dpf_xsec_ccpi.pdf

2:42 PM Status of the Electron-Neutrino Charged-Current Inclusive Cross-Section Measurement in NOvA

The electron-neutrino charged-current inclusive cross section on nuclei is an important input parameter for electron-neutrino appearance oscillation experiments. There are a small number of measurements, with limited statistics, in the few GeV region where current and future long base-line neutrinos experiments operate. The NOvA near detector is located at Fermilab, approximately 800 m from the NuMI beam production target and thus provides an excellent platform to measure and study neutrino interactions and cross sections with high statistics. We present our progress, including the use of a convolutional visual network (CVN) technique as event classifier, on this neutrino scattering measurement in the energy range of 1-3 GeV with data collected from November 2014 to February 2017 in the NOvA near detector.

Speaker: Mr Pengfei Ding

Slides DPF2017_dingpf_nuecc_xsec_20170801_v2.pdf

3:00 PM Measurement of Neutrino-Electron Elastic Scattering at NOvA Near Detector

NOvA is a long-baseline accelerator-based neutrino oscillation experiment that is optimized for electron-neutrino appearance measurements. It uses the upgraded NuMI beam from Fermilab and consists of a Far Detector in Ash River, Minnesota and a Near Detector at Fermilab. An accurate prediction of the neutrino flux is key to both oscillation and cross-section measurements. The precisely known neutrino-electron elastic scattering cross section provides an in situ constraint on the absolute flux. This talk discusses the status of the measurement of the rate of neutrino-electron elastic scattering in the NOvA Near Detector.

Speaker: Prof. Jianming Bian (University of California, Irvine)

Slides nova_nu-on-e_2017_08_01.pdf

1:30 PM → 3:15 PM Particle Detectors: Tuesday afternoon

Convener: Georgia Karagiorgi (Columbia University)

1:30 PM Studies of GaInP based Geiger-mode APD arrays

Devices composed of wide band gap semiconductors such as GaInP have the theoretical potential to withstand many orders of magnitude larger radiation exposures compared to silicon. LightSpin Technologies has developed high density, large area SPAD arrays in GaInP with resolution for single photon peaks over the past several years. We report on measurements using a sample of the latest generation of prototype devices, demonstrating performance properties of new large GAPD arrays based on this compound semiconductor.

Speakers: Prof. Bob Hirosky (Virginia), Grace Cummings (Virginia Commonwealth University)

Slides Hirosky_DPF2017.pdf

1:51 PM Detecting Axions with Superconducting Qubits

The Axion Dark Matter eXperiment (ADMX) aims to detect dark matter axions converting to single photons in a resonant cavity bathed in a uniform magnetic field. A qubit (two level system) operating as a single microwave photon detector is a viable readout system for ADMX and may offer advantages over the quantum limited amplifiers currently used ADMX. When weakly coupled to the detection cavity, the qubit transition frequency is shifted by an amount proportional to the cavity photon number. Through spectroscopy of the qubit, the frequency shift is measured and the cavity occupation number is extracted. At low enough temperatures, this system would allow sensitivities exceeding that of the standard quantum limit.

Speaker: Akash Dixit (University of Chicago)

Slides avdixit_DPF2017.pdf

2:12 PM Gain stabilization of Silicon Photomultipliers and Afterpulsing

The gain of silicon photomultipliers (SiPMs) increases with bias voltage and decreases with temperature. To operate SiPMs at stable gain, the bias voltage can be adjusted to compensate temperature changes. We have tested this concept with 30 SiPMs from three manufacturers (Hamamatsu, KETEK, CPTA) in a climate chamber at CERN varying the temperature from 1°C to 50°C. We built an adaptive power supply that used a linear temperature dependence of the bias voltage readjustment. With one selected bias voltage readjustment, we stabilized four SiPMs simultaneously. We fulfilled our goal of limiting the deviation from gain stability in the 20°C-30°C temperature range to less than ±0.5% for most of the tested SiPMs. We have studied afterpulsing of SiPMs for different temperatures and bias voltages.

Speaker: Prof. Gerald Eigen (University of Bergen)

Slides GE2-DPF17.pdf

2:33 PM Directional measurements of fast neutron backgrounds at SuperKEKB

During the commissioning of the SuperKEKB accelerator, the next-generation B factory located in Tsukuba, Japan, the BEAST II detector system was used to measure beam induced backgrounds. Fast neutrons have proven to be a notoriously pernicious background at collider experiments. Among the many measurements made by BEAST II, the Micro Time Projection Chambers (µTPCs) subsystem provided direction-sensitive measurements of fast neutrons by reconstructing the charge clouds from nuclear recoils in gas with high spatial resolution. We present measurements from the first SuperKEKB run, and compare the resulting data with beam-loss and detector simulations.

Speaker: Michael Hedges (BEAST II Collaboration)

Slides