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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

et al.
Abstract

A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m ℓ ℓ < 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 → ℓ ℓ 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 → ℓ ℓ γ branching ratio for m ℓ ℓ < 30 GeV is determined to be 8.7 − 2.7 + 2.8 fb.

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