Ms
Veronika Magerl
(University of Freiburg)
7/15/19, 4:30 PM
Higgs/EW/BSM
Despite the absence of experimental evidence, weak-scale supersymmetry remains one of the
best motivated and studied Standard Model extensions. Searches for weak-scale supersymmetry
interact with QCD in many ways: QCD scaling rules are used in background estimation techniques;
jet sub-structure is exploited for separating signal and background; signal cross sections
rely on higher-order...
Ms
Emma Slade
(University of Oxford)
7/15/19, 4:55 PM
Higgs/EW/BSM
We present a novel framework to carry out global analyses of the Standard Model Effective Field Theory (SMEFT) at dimension-six: SMEFiT. The SMEFiT approach is based on the Monte Carlo replica method to derive a faithful estimate of the experimental and theoretical uncertainties and enables one to construct the probability distribution in the space of the SMEFT degrees of freedom.
As a...
Abhijith Gandrakota
7/15/19, 5:20 PM
Higgs/EW/BSM
Abstract:Finding multi-jets resonances at LHC is almost impossible, due to the huge QCD multi-jet backgrounds. We have created new techniques for these searches that suppress QCD backgrounds. Our tools make use of the rich information from the internal kinematics of multi-jet decays to form Dalitz variables. These variables can be used to identify inherent differences in multi-jet topologies...
Dr
Jennifer Kile
(none)
7/15/19, 5:45 PM
Higgs/EW/BSM
We investigate an excess observed in hadronic events in the archived LEP2 ALEPH data. The events are clustered into four jets and paired such that the mass difference between the two dijet systems is minimized. The excess occurs in the region M1+M2∼110 GeV; about half of the excess is concentrated in the region M1∼80 GeV, M2∼25 GeV, with a local significance between 4.7σ and 5.5σ, depending on...
Mr
Andrea Pelloni
(ETHZ)
7/16/19, 2:00 PM
Higgs/EW/BSM
I will discuss the computation of the Higgs rapidity distribution at N$^3$LO in the gluon fusion production mode. Our approach relies on the fully analytic computation of six terms in a systematic expansion of the partonic differential cross section around the production threshold of the Higgs boson at next-to-next-to-next-to leading order in QCD perturbation theory. We observe a mild...
Mr
Roberto Mondini
(University at Buffalo)
7/16/19, 2:25 PM
Higgs/EW/BSM
We present a fully-differential calculation of the $H \to b\overline{b}$ decay at next-to-next-to-next-to-leading order (N3LO) accuracy. Our calculation considers diagrams in which the Higgs boson couples directly to the bottom quarks. In order to regulate the infrared divergences present at this order we use the Projection-to-Born technique coupled with N-jettiness slicing. After validating...
Jannik Geisen
(II. Physikalisches Institut, Georg-August-Universität Göttingen)
7/16/19, 2:50 PM
Higgs/EW/BSM
The measurement of the associated production of a heavy boson with
two top quarks (ttbar+W/Z/Higgs) allows for stringent tests of perturbative QCD.
This talk presents the most recent cross section measurements of tt+W/Z/H
production performed by the ATLAS experiment based on the he pp collision
dataset collected at 13 TeV, and comparison to the state-of-the-art theory predictions.
Xing Wang
(University of Pittsburgh)
7/16/19, 3:15 PM
Higgs/EW/BSM
It is extremely challenging to probe the charm-quark Yukawa coupling at hadron colliders primarily due to the large Standard Model (SM) background (including $h\to b\bar b$) and the lack of an effective trigger for the signal $h\to c\bar c$. We examine the feasibility of probing this coupling at the LHC via a Higgs radiative decay $h\rightarrow c\bar{c}\gamma$. The existence of an additional...
Dr
WEIMIN SONG
(Rutherford Appleton Laboratory)
7/16/19, 3:40 PM
Higgs/EW/BSM
A detailed study of Higgs interference e?ffects at the one-loop level in the 1-Higgs-Singlet extension of the Standard Model (1HSM) is presented for the WW and t?t decay modes with fully leptonic WW decay. We explore interference effects for benchmark points with a heavy Higgs mass that significantly exceeds 2mt. In the WW channel, the Higgs signal and the interfering continuum background are...
Dr
Christophe Royon
(CEA Saclay),
Christophe Royon, Dr
Christophe Royon
(IRFU-SPP, CEA Saclay)
7/18/19, 4:30 PM
We will present the first results and the physics prospects from the CMS Precision Proton Spectrometers namely the observation of exclusive dileptons at high mass, and the search for high mass exclusive diphoton production, as a signal for quartic anomalous couplings and axion like particles at the LHC in the CMS collaboration
Mr
Elliot Reynolds
(University of Birmingham)
7/18/19, 4:55 PM
The Large Hadron Collider (LHC) has been successfully delivering proton-proton
collision data at the unprecedented center of mass energy of 13 TeV.
An upgrade is planned to increase the instantaneous luminosity delivered
by LHC in what is called HL-LHC, aiming to deliver a total of about 3000/fb of
data to the ATLAS detector at a center of mass energy of 14 TeV. To cope with
the expected...
Dr
Valentin Hirschi
(ETHZ)
7/18/19, 5:45 PM
Loop Tree Duality (LTD) offers a promising avenue to numerically
integrate multi-loop integrals directly in momentum space by relating
them to on-shell trees.
I will first present our novel formulation of this duality, applicable
systematically and for generic multi-loop integrals.
I will then showcase our first numerical results for up to four-loop
finite scalar topologies, and conclude...
Mr
Samuel Abreu
(UCLouvain)
7/18/19, 6:10 PM
I will discuss the recent calculation of the full set of two-loop five-point amplitudes relevant for phenomenological studies at hadron colliders in the framework of two-loop numerical unitarity. Combined with analytic reconstruction techniques, numerical unitarity can be used to efficiently extract analytic expressions for these amplitudes. Physical constraints allow to simplify these...