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5–11 Jun 2022
McMaster University
America/Toronto timezone
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Search for single production of a vector-like T quark decaying into a Higgs boson and top quark with fully hadronic final states using the ATLAS detector

6 Jun 2022, 14:15
15m
MDCL 1105 (McMaster University)

MDCL 1105

McMaster University

Oral not-in-competition (Graduate Student) / Orale non-compétitive (Étudiant(e) du 2e ou 3e cycle) Particle Physics / Physique des particules (PPD) M2-1 Exploring the Energy and Precision Frontier II (PPD) | Exploration de la frontière d'énergie et de précision II (PPD)

Speaker

Joel Hengwei Foo (University of Toronto (CA))

Description

A search is made for a vector-like T quark decaying into a Higgs boson and a top quark in 13 TeV proton-proton collisions using the ATLAS detector at the Large Hadron Collider with a data sample corresponding to an integrated luminosity of 139 fb1.
The all-hadronic decay modes Hbb¯ and tbWbqq¯ are reconstructed as large-radius jets and identified using tagging algorithms.
Improvements in background estimation, signal discrimination, and a larger data sample, contribute to an improvement in sensitivity over previous all-hadronic searches.
No significant excess is observed above the background, so limits are set on the production cross-section of a singlet T quark at 95% confidence level, depending on the mass, mT, and coupling, κT, of the vector-like T quark to Standard Model particles.
This search targets a mass range between 1.0 to 2.3 TeV, and a coupling value between 0.1 to 1.6, expanding the phase space of previous searches.
In the considered mass range, the upper limit on the allowed coupling values increases with mT from a minimum value of 0.35 for 1.07 <mT< 1.4 TeV up to 1.6 for mT=2.3 TeV.

Authors

Joel Hengwei Foo (University of Toronto (CA)) Joseph Haley (Oklahoma State University (US)) Pekka Sinervo (University of Toronto (CA)) Sahibjeet Singh (University of Toronto (CA))

Presentation materials