PoS - Proceedings of Science
Volume 398 - The European Physical Society Conference on High Energy Physics (EPS-HEP2021) - T09: Higgs Physics
Study of the CP properties of the top-quark Yukawa Interaction in ttH and tH events with H → γγ
M.M. Lopez
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Pre-published on: December 23, 2021
Published on:
Abstract
These proceedings present the first search for CP-violation in the top-Yukawa coupling using $t\bar{t}H$ and $tH$ production modes in the diphoton decay channel ($H\to\gamma\gamma$).
The analysis is based on the 139 fb$^{-1}$ of proton-proton collision data at center-of-mass energy $\sqrt{s}$=13 TeV recorded with the ATLAS detector at the Large Hadron Collider.
Two separate set of selections are introduced to capture the full hadronic and leptonic decay of the $t\bar{t}$ system each.
This search is performed using a simultaneous fit to the diphoton invariant mass distribution in analysis categories defined to enhance signal over continuum background and also to separate the CP-even and CP-odd signal hypotheses.
DOI: https://doi.org/10.22323/1.398.0570
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