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

ATLAS Publications, T.M. Carter, A. Hasib, S. Palazzo, A. Søgaard, E.P. Takeva, N. Themistokleous, E.M. Villhauer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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 fb−1 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 H → γ process is found with a significance of 3.2 over the background-only hypothesis, compared to an expected significance of 2.1 for the Standard Model prediction. 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 H → γ branching ratio for m < 30 GeV is determined to be 8.7+2.8−2.7 fb
Original languageEnglish
Article number136412
Pages (from-to)1-22
Number of pages22
JournalPhysics Letters B
Volume819
Early online date31 May 2021
DOIs
Publication statusPublished - 10 Aug 2021

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