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Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector
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Search for exclusive Higgs and Z boson decays to ωγ and Higgs boson decays to K⁎γ with the ATLAS detector

G. Aad, B. Abbott, K. Abeling, S.H. Abidi, A. Aboulhorma, H. Abramowicz, H. Abreu, Y. Abulaiti, A.C. Abusleme Hoffman, B.S. Acharya, …
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 卷.847, 138292
12/2023
DOI: https://doi.org/10.1016/j.physletb.2023.138292

摘要

Nuclear and High Energy Physics
Searches for the exclusive decays of the Higgs boson to an ω meson and a photon or a K <sup>⁎</sup> meson and a photon can probe flavour-conserving and flavour-violating Higgs boson couplings to light quarks, respectively. Searches for these decays, along with the analogous Z boson decay to an ω meson and a photon, are performed with a pp collision data sample corresponding to integrated luminosities of up to 134 fb <sup>−1</sup> collected at s=13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The obtained 95% confidence-level upper limits on the respective branching fractions are B(H→ωγ)<5.5×10 <sup>−4</sup> , B(H→K <sup>⁎</sup> γ)<2.2×10 <sup>−4</sup> and B(Z→ωγ)<3.9×10 <sup>−6</sup> . The limits for H→ωγ and Z→ωγ are 370 times and 140 times the Standard Model expected values, respectively. The result for Z→ωγ corresponds to a two-orders-of-magnitude improvement over the limit obtained by the DELPHI experiment at LEP.

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