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
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(Published version)
Date
2024
Authors
Aad, G.
Abbott, B.
Abbott, D.C.
Abeling, K.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Abusleme Hoffman, A.C.
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Journal article
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Physics Letters B, 2024; 849:138469-1-138469-25
Statement of Responsibility
The ATLAS Collaboration
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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, 𝑡̄𝑡𝐻, 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 𝑡̄𝑡𝐻 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 ◦+52◦ −73◦ , compatible with the SM prediction corresponding to 𝛼 = 0.
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Available online 18 January 2024
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© 2024 The Author(s). Published by Elsevier B.V. Funded by SCOAP³. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).