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

ATLAS Publications, T.M. Carter, R.Y. Gonzalez Andana, A. Hasib, V.A. Parrish, E.A. Pender, T. Qiu, E.P. Takeva, N. Themistokleous, E.M. Villhauer, E. Zaid

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Searches for the exclusive decays of the Higgs boson to an 𝜔 meson and a photon or a 𝐾∗ 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−1 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 β(𝐻 → 𝜔𝛾) < 5.5 × 10−4 , β(𝐻 → 𝐾∗𝛾) < 2.2 × 10−4 and β(𝑍 → 𝜔𝛾) < 3.9 × 10−6 .
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.
Original languageEnglish
Article number138292
Pages (from-to)1-23
Number of pages23
JournalPhysics Letters B
Volume847
DOIs
Publication statusPublished - 10 Dec 2023

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