Probing the CP nature of the top–Higgs Yukawa coupling in tt¯H and tH events with H→bb¯ decays using the ATLAS detector at the LHC

The ATLAS collaboration

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4 Citations (Scopus)

Abstract

The CP properties of the coupling between the Higgs boson and the top quark are investigated using 139 fb−1 of proton–proton collision data recorded by the ATLAS experiment at the LHC at a centre-of-mass energy of s=13 TeV. The CP structure of the top quark–Higgs boson Yukawa coupling is probed in events with a Higgs boson decaying into a pair of b-quarks and produced in association with either a pair of top quarks, tt¯H, or a single top quark, tH. Events containing one or two electrons or muons are used for the measurement. Multivariate techniques are used to select regions enriched in tt¯H and tH events, where dedicated CP-sensitive observables are exploited. In an extension of the Standard Model (SM) with a CP-odd admixture in the top–Higgs Yukawa coupling, the mixing angle between CP-even and CP-odd couplings is measured to be α=11−73∘+52, compatible with the SM prediction corresponding to α=0.

Original languageEnglish
Article number138469
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume849
DOIs
Publication statusPublished - Feb 2024

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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