US LUA - (US LHC Users Association)

Session

Lightning Round Talks (1)

14 Dec 2023, 10:30

Conveners

Lightning Round Talks (1)

• Claire Lee ()

Contribution list Timetable

58. Tests of lepton flavour universality violation with Bc meson decays at CMS

Luigi Marchese (ETH Zürich)

14/12/2023, 10:30

New physics can manifest itself via lepton-flavour-universality-violating (LFUV) processes in LHC proton-proton collisions. In this talk I will discuss the first measurement testing LFUV between tau-leptons and muons with the CMS detector using Bc mesons. In more detail, I will present the measurement of the ratio of the branching fractions R(J/Ψ) = Bc→J/Ψ(μμ)τν / Bc→J/Ψ(μμ)μν using...

61. Search for top-philic resonances with the ATLAS Detector

Elise Le Boulicaut Ennis

14/12/2023, 10:40

Heavy resonances coupling predominantly to top quarks (top-philic) are predicted by some extensions of the Standard Model. These models can address several open questions, in particular the "naturalness problem" which corresponds to the fine-tuned corrections necessary to explain the Higgs boson mass. The analysis presented here searches for top-philic resonances in final states with three or...

60. A Search for Vector-Like Leptons (VLLs)

Elise Chavez

14/12/2023, 10:50

The Standard Model is the current theoretical description of fundamental particles and their interactions. While it is able to describe the majority of phenomena that we observe, there are many that it cannot accommodate for. Such phenomena are dark matter, dark energy, and lepton non-universality. New theories have been proposed that extend the Standard Model in order to answer these long...

59. A Search for Vector-Like Leptons: Compact Analysis

Nadia Talbi (University of Wisconsin-Madison)

14/12/2023, 11:00

The Standard Model (SM) conveys our fundamental understanding of matter and its interactions in the universe, yet within the current Standard Model, there remain disagreements. Theoretical extensions of the Standard Model are being developed in hopes to resolve these conflicts. Several SM extensions predict the existence of a new type of particle, the vector-like lepton (VLL). In a proposed...

84. First Measurement of W Helicity Fractions at LHCb

Nate Grieser (University of Cincinnati (US))

14/12/2023, 11:10

The measurement of the $W$ helicity states provides a fundamental probe at understanding the production mechanisms of $W$ bosons at the LHC. $W$ boson helicity states have shown a strong dependency on $|y_{W}|$, with increasingly left-handed states expected with forward production. The LHCb detector provides a unique kinematic coverage, with lepton acceptance of $2 < \eta < 5$, in which an...

92. Tile Module Assembly for the CMS High Granularity Calorimeter at Fermilab

Ryan Kim (Florida State University)

14/12/2023, 11:20

In the HL-LHC era, the High Granularity Calorimeter (HGCAL) will replace the existing calorimeter endcaps of the CMS detector. The HGCAL is the first 5D imaging calorimeter to be used in a collider physics experiment, designed to withstand radiation and handle large pileup through the full operation of the HL-LHC. The HGCAL will be constructed with radiation-hard silicon sensors in the layers...

73. Probing EFT models using associated top production in multiple lepton final states

Furong Yan (University of Nebraska-Lincoln)

14/12/2023, 11:30

A search for new physics in top quark production with additional final-state leptons is performed with 138 fb-1 of proton-proton collisions at √s = 13 TeV, collected by the CMS detector during 2016, 2017, and 2018. Using the framework of effective field theory (EFT), potential new physics effects are parametrized in terms of 26 dimension-six EFT operators. The data are divided into several...

90. The ATLAS TRT Fast-OR Trigger for Ultra-Peripheral Heavy-Ion Collisions

Gwen Gardner (University of Pennsylvania)

14/12/2023, 11:40

The ATLAS heavy-ion group has made important observations lately including light-by-light scattering and tau-lepton pair production in lead-ion runs at the LHC. These analyses are part of the ultra-peripheral physics program, which studies events in which the electromagnetic clouds around the ions interact rather than the lead-ion nuclei themselves, giving photon-photon interactions at high...

55. Weakly supervised training for optimal transport pileup mitigation strategies at hadron colliders

Nathan Suri

14/12/2023, 11:50

On average, during Run 2 of the Large Hadron Collider (LHC), 30-50 simultaneous vertices yielding charged and neutral showers, otherwise known as pileup, were recorded per event. This number is expected to only increase at the High Luminosity LHC with predicted values as high as 200. As such, pileup presents a salient problem that, if not checked, hinders the search for new physics as well as...