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Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at √s = 13 TeV with the ATLAS detector

Physics

Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at √s = 13 TeV with the ATLAS detector

T. A. Collaboration

Discover groundbreaking results on Higgs boson decays into visible photons and dark photons as revealed by the ATLAS Collaboration. With extensive data from proton-proton collisions at the LHC, the research sets stringent limits on decay branching ratios and cross-sections, paving the way for insights into higher-mass Higgs bosons.

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Playback language: English
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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