PhysicsJHEP

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.... show more

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Abstract

A combination of searches for Higgs boson decays into a visible photon and a massless dark photon (H → γγa) is presented 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 determined to be B(H → γγa) < 1.3% (1.5) %. The search is also sensitive to higher-mass Higgs bosons decaying into the same final state. 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 also interpreted in the context of a minimal simplified model.

Publisher

JHEP

Published On

Aug 22, 2024

Authors

The ATLAS Collaboration

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