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Article
Report number arXiv:2103.10322 ; CERN-EP-2021-035
Title Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at s= 13 TeV with the ATLAS detector
Related titleEvidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at s = 13 TeV with the ATLAS detector
Author(s) ATLAS Collaboration  Show all 2888 authors
Corporate Author(s) ATLAS Collaboration
Publication 2021-05-31
Imprint 18 Mar 2021
Number of pages 39
Note 39 pages in total, author list starting page 23, 5 figures, 1 table, submitted to PLB, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2018-43/
In: Phys. Lett. B 819 (2021) 136412
DOI 10.1016/j.physletb.2021.136412 (publication)
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; ATLAS
Free keywords Higgs physics ; particle and resonance production ; experimental results
Abstract A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m<30 GeV is presented. The analysis is performed using 139 fb1 of proton-proton collision data, produced by the LHC at a centre-of-mass energy of 13 TeV and collected by the ATLAS experiment. Evidence for the Hγ process is found with a significance of 3.2σ over the background-only hypothesis, compared to an expected significance of 2.1σ. The best-fit value of the signal strength parameter, defined as the ratio of the observed signal yield to the one expected in the Standard Model, is μ=1.5±0.5. The Higgs boson production cross-section times the Hγ branching ratio for m< 30 GeV is determined to be 8.7 2.7+2.8 fb.
Related document supersedes: ATLAS-CONF-2021-002
Copyright/License publication: © 2021-2025 The Author (License: CC-BY-4.0), sponsored by SCOAP³
preprint: © 2021-2025 CERN (License: CC-BY-4.0)



Corresponding record in: Inspire
Email contact: tatjana.lenz@cern.ch


 Record created 2021-03-18, last modified 2024-07-05


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