Searches for exclusive Higgs boson decays into 𝐷∗𝛾 and 𝑍 boson decays into 𝐷⁰𝛾 and 𝐾⁰𝑠 𝛾 in 𝑝𝑝 collisions at √ 𝑠 =13TeV with the ATLAS detector
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(Published version)
Date
2024
Authors
Aad, G.
Aakvaag, E.
Abbott, B.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboelela, M.
Aboulhorma, A.
Abramowicz, H.
Abreu, H.
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Journal article
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Physics Letters B, 2024; 855:138762-1-138762-25
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The ATLAS Collaboration
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Abstract
Searches for exclusive decays of the Higgs boson into 𝐷∗𝛾 and of the 𝑍 boson into 𝐷0𝛾 and 𝐾0 𝑠 𝛾 can probe flavour-violating Higgs boson and 𝑍 boson couplings to light quarks. Searches for these decays are performed with a 𝑝𝑝 collision data sample corresponding to an integrated luminosity of 136.3 fb−1 collected at √𝑠=13TeV between 2016–2018 with the ATLAS detector at the CERN Large Hadron Collider. In the 𝐷∗𝛾 and 𝐷0𝛾 channels, the observed (expected) 95% confidence-level upper limits on the respective branching fractions are ß(𝐻 → 𝐷∗𝛾) <1.0(1.2) ×10−3, ß(𝑍 → 𝐷0𝛾) < 4.0(3.4) ×10−6, while the corresponding results in the 𝐾0 𝑠 𝛾 channel are ß(𝑍 →𝐾0 𝑠 𝛾) <3.1(3.0) ×10−6.
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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/).