Abstract
A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass
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
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
. The Higgs boson production cross-section times the
branching ratio for
GeV is determined to be
fb.
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© 2021 The Author. Published by Elsevier B.V.