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.

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

M. Cristoforetti;A. Di Luca;
2021-01-01

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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11582/327315
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