24-26 October 2018
Fermilab
US/Central timezone
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Contribution List

Displaying 41 contributions out of 41
The ATLAS experiment is conducting a search for high mass resonant and non-resonant features in dilepton (ee, mumu) spectra using the full Run-2 dataset. Models with new contact interactions (CI) and large extra dimensions (ADD) can manifest themselves as a slight enhancement in the high mass tail of the spectrum. The challenge is to develop a background model that can constrain the shape of the t ... More
Presented by Aaron WHITE on 26 Oct 2018 at 9:50 AM
on 25 Oct 2018 at 2:00 PM
on 25 Oct 2018 at 11:20 AM
Higgs production in association with top quarks (ttH) is predicted by the Standard Model at a rate of about 1% of the total Higgs cross section. This process directly probes the Higgs-top coupling, a critical parameter for isolating Beyond the Standard Model contributions to Higgs physics. The ATLAS search for ttH events in conjunction with the decay H → γγ takes advantage of the high photon d ... More
Presented by Jennet DICKINSON on 26 Oct 2018 at 9:30 AM
on 26 Oct 2018 at 5:00 PM
on 25 Oct 2018 at 11:50 AM
Two recent searches for new physics from the CMS experiment are shown. The first of which is a search for direct production of the tau slepton production in pp collisions at a center-of-mass energy of 13 TeV. The analysed data correspond to an integrated luminosity of 35.9 fb−1 collected with the CMS detector in 2016 and 41.3 fb−1 collected in 2017. The search is performed using events wit ... More
Presented by Mr. Owen COLEGROVE on 26 Oct 2018 at 10:00 AM
on 26 Oct 2018 at 11:30 AM
on 26 Oct 2018 at 11:50 AM
The possibility that dark matter particles may interact via unknown forces, felt only feebly by Standard Model particles, has motivated substantial effort to search for dark-sector forces, the dark photon being a promising candidate. Its motivation, LHCb search results, and current limits will be presented.
Presented by Constantin WEISSER on 26 Oct 2018 at 9:40 AM
At small Bjorken-x, the large gluon number density in the nucleon leads to gluon recombination competing with gluon splitting, which could result in saturation of the gluon PDF. This gluon saturation has yet to be conclusively observed. Direct photon production provides sensitivity to gluon densities in protons and nuclei, and the forward acceptance of LHCb detector allows for measurements of this ... More
Presented by Thomas Julian BOETTCHER on 25 Oct 2018 at 4:10 PM
on 25 Oct 2018 at 5:00 PM
on 26 Oct 2018 at 9:00 AM
After the discovery of the Higgs Boson in 2012 a major goal for Higgs physics is the more precise measurement of its couplings, especially that of its dominant but largely unconstrained decay to bb. Beyond the importance of this measurement to our understanding of the SM, these constraints also serve as a probe of new physics beyond the SM. This year the ATLAS collaboration leveraged the combined ... More
Presented by Jake PASNER on 26 Oct 2018 at 2:10 PM
The latest measurements of the jet fragmentation and the angular distributions of charged particles within and around jets, as performed with the ATLAS detector in Pb+Pb collisions at the LHC a. Jets are direct probes of the QCD medium created in these collisions, and studying jet fragmentation provides insight into the strength and mechanism of jet quenching. Fragmentation functions in Pb+Pb coll ... More
Presented by Akshat PURI on 25 Oct 2018 at 4:20 PM
The production of deuterons in high-energy collisions is particularly sensitive to the space and time evolution of the system, as well as the baryon production and transport mechanisms. Recent ALICE measurements of spectra and anisotropic flow of (anti-)deuterons provide insight into the production mechanisms of particles in heavy-ion collisions thanks to a critical comparison with the available t ... More
Presented by Brennan SCHAEFER on 26 Oct 2018 at 10:20 AM
on 25 Oct 2018 at 1:30 PM
Presented by Savannah THAIS on 26 Oct 2018 at 1:50 PM
In 2017 CMS was the first experiment to observe the Higgs boson in its decay to Tau Leptons. Now, using 35.9 1/fb of data collected by CMS from proton-proton collisions at the Large Hadron Collider in 2016, this channel is used to search for anomalous couplings in the production of the Higgs. The search is performed using the Matrix Element Likelihood Analysis (MELA) method to constrain four diffe ... More
Presented by Samuel Lloyd HIGGINBOTHAM on 25 Oct 2018 at 4:30 PM
A measurement of the shape of the differential decay rate and associ- ated Isgur-Wise function for the decay Λ0b → Λc + μ−ν has been performed using data corresponding to 3fb−1 collected with the LHCb detector using proton-proton collisions. The Λ+c μ−ν final states are reconstructed by the detection of a muon and a Λ+c baryon decaying to pK−π+, and the decay Λ0b → Λ+c π+π ... More
Presented by Scott Edward ELY on 25 Oct 2018 at 4:00 PM
The production cross section of a top quark pair plus a radiated photon is measured during proton-proton collisions at the centre of mass energy of 13 TeV corresponding to an integrated luminosity of 35.86 inverse fb at the LHC, at CERN. The data was recorded by the Compact Muon Solenoid experiment. The signal region is defined by top quark pairs, an isolated lepton, photon, jets from the hadroniz ... More
Presented by Ms. Titas ROY on 26 Oct 2018 at 2:00 PM
on 25 Oct 2018 at 9:10 AM
on 26 Oct 2018 at 12:10 PM
Natural supersymmetry has earned a unique focus in LHC search efforts, in part due to its solution to the hierarchy problem. Minimizing fine tuning in this solution leads to light Higgs superpartners, known as higgsinos, with many predictions of their masses well within LHC reach. In order to also provide a valid dark matter candidate, the lightest three higgsinos are expected to have small mass s ... More
Presented by Ms. Julia GONSKI on 26 Oct 2018 at 4:50 PM
Silicon sensors find application in the phase 2 upgrade of the inner and outer tracker and the endcap calorimeter for CMS. In these locations they will be exposed to a high fluence of charged particles and neutrons. We are using the research reactor at the Rhode Island Nuclear Science Center to expose prototype sensors to neutrons to understand their effect on the performance of the sensors. The t ... More
Presented by Bjorn BURKLE on 26 Oct 2018 at 1:40 PM
The CMS hadronic calorimeter (HCAL) employs a plastic-scintillator-based endcap detector. The CMS HCAL Phase 1 upgrade involves installing silicon photomultipliers (SiPM) to measure light from scintillators in the detector. The SiPM signals are digitized by custom readout cards, called QIE cards, using the charge integration and encoder version 11 (QIE11) chip. The QIE cards for the HCAL endcap (H ... More
Presented by Caleb SMITH on 26 Oct 2018 at 1:30 PM
Exotic decays of the Standard Model (SM) Higgs boson provide a unique window for the discovery of new physics, as the Higgs may couple to hidden-sector states that do not interact under the SM gauge transformations. Models predicting exotic Higgs decays to additional light bosons appear in many extensions to the SM and can explain several unknowns in physics, such as the nature of dark matter and ... More
Presented by Christopher HAYES on 26 Oct 2018 at 10:10 AM
Inspired by developments from the Tau Combined Performance group, the Tau Trigger group recently introduced a Recurrent Neural Network architecture to identify HLT tau leptons in place of our previous Boosted Decision Tree architecture. In this talk, I'll summarize the implementation and performance of this new RNN tau identification scheme within the HLT.
Presented by Mariel PETTEE on 26 Oct 2018 at 4:10 PM
Production of massive vector bosons via vector boson scattering provides a direct probe of the self-interactions of the massive vector bosons, which are intimately connected to the Higgs-Englert-Brout mechanism of EW symmetry breaking. A search for vector boson scattering of W and Z bosons has recently been performed by the CMS experiment using data collected in 2016. I will present this search as ... More
Presented by Kenneth David LONG on 25 Oct 2018 at 4:50 PM
We present a model-independent search for beyond-standard-model heavy resonances decaying into a W boson and a photon. Possible models include charged Higgs, W', and supersymmetric mesons in folded-SUSY. The lepton channel is used as it has lower background and higher sensitivity to still uninvestigated resonance mass ranges. We aim to set cross-section limits through detailed data analysis of CMS ... More
Presented by Kak WONG on 26 Oct 2018 at 4:20 PM
A search for a heavy resonance decaying into a top quark and antiquark pair is performed using proton-proton collisions at 13 TeV. The search uses the dataset collected with the CMS detector in 2016, which corresponds to an integrated luminosity of 35.9 1/fb. The analysis is split into three exclusive final states and uses reconstruction techniques that are optimized for top quarks with high Loren ... More
Presented by Ms. Bahareh ROOZBAHANI on 26 Oct 2018 at 2:20 PM
on 25 Oct 2018 at 9:50 AM
The LHC will be upgraded to the High Luminosity (HL-LHC) in the late 2020 to further increase the discovery potential of the machine. During the HL-LHC the instantaneous luminosity will be as high as 7x10^34 cm^−2s^−1 in order to collect 10x more proton-proton collision data than at the LHC. The HL-LHC upgrade will set unprecedented challenges from the point of view of both detector and electr ... More
Presented by Fabio RAVERA on 26 Oct 2018 at 4:40 PM
The LHCb detector will operate with 40 MHz readout and full-software trigger at higher luminosity, after Phase-1 upgrade. The Upstream Tracker (UT) is a critical part of the upgrade that will increase the data rate and trigger efficiency. In this talk, I will describe the purpose and design of UT, with an emphasis on its off-detector electronics.
Presented by Zishuo YANG on 26 Oct 2018 at 4:00 PM
on 25 Oct 2018 at 10:50 AM
Including committee reports
on 25 Oct 2018 at 9:20 AM
on 25 Oct 2018 at 9:00 AM
In 2012, the LHC experiments discovered a Higgs boson-like particle, however there are still outstanding questions about the Higgs sector. Is this the Standard Model (SM) Higgs? Are there any additional Higgs bosons? Does physics Beyond the SM exist? In this talk I will explain how studying di-Higgs production can provide a unique window into these questions, as well as insight into electroweak sy ... More
Presented by Tyler James BURCH on 25 Oct 2018 at 4:40 PM
This talk will focus on the ttH multi-lepton (non hadronic tau) channel. Since these channel is dominated by fake lepton background, data driven method is used in this channel to estimate those event, and with separately estimate norm factor for fakes from difference source, we have a relatively good modeling in the signal region and control region.
Presented by Zhi ZHENG on 26 Oct 2018 at 4:30 PM