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Abstract
This paper presents a combination of searches for Higgs boson decays into a visible photon and a massless dark photon (H → γγa) using 139 fb−1 of proton-proton collision data at a centre-of-mass energy of √s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on the Standard Model Higgs boson decay branching ratio is B(H → γγa) < 1.3% (1.5)%. The search is also sensitive to higher-mass Higgs bosons. The observed (expected) 95% confidence level limit on the cross-section times branching ratio ranges from 16 fb (26 fb) for ma = 400 GeV to 1.0 fb (1.5 fb) for mH = 3 TeV. Results are interpreted in a minimal simplified model.
Publisher
JHEP
Published On
Aug 22, 2024
Authors
The ATLAS Collaboration
Tags
Higgs boson
dark photon
LHC
ATLAS detector
particle physics
branching ratio
cross-section

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