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

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dc.contributor.authorAad, G.
dc.contributor.authorAbbott, B.
dc.contributor.authorAbbott, D.C.
dc.contributor.authorAbed Abud, A.
dc.contributor.authorAbeling, K.
dc.contributor.authorAbhayasinghe, D.K.
dc.contributor.authorAbidi, S.H.
dc.contributor.authorAbouZeid, O.S.
dc.contributor.authorAbraham, N.L.
dc.contributor.authorAbramowicz, H.
dc.contributor.authorAbreu, H.
dc.contributor.authorAbulaiti, Y.
dc.contributor.authorAbusleme Hoffman, A.C.
dc.contributor.authorAcharya, B.S.
dc.contributor.authorAchkar, B.
dc.contributor.authorAdam, L.
dc.contributor.authorAdam Bourdarios, C.
dc.contributor.authorAdamczyk, L.
dc.contributor.authorAdamek, L.
dc.contributor.authorAdelman, J.
dc.contributor.authoret al.
dc.date.issued2021
dc.description.abstractA search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass mll<30 GeV is presented. The analysis is performed using 139 fb−1of 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→ll γprocess 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→llγbranching ratio for mll<30 GeV is determined to be 8.7+2.8−2.7fb
dc.description.statementofresponsibilityG. Aad, B. Abbott, D.C. Abbot ... Paul Jackson ... Harish Potti ... Martin White ... et al.
dc.identifier.citationPhysics Letters B, 2021; 819:136412-1-136412-22
dc.identifier.doi10.1016/j.physletb.2021.136412
dc.identifier.issn0370-2693
dc.identifier.issn1873-2445
dc.identifier.orcidJackson, P. [0000-0002-0847-402X]
dc.identifier.orcidKong, A.X.Y. [0000-0001-8063-8765]
dc.identifier.orcidMcDougall, A.E. [0000-0001-7713-2800]
dc.identifier.orcidOliver, J.L. [0000-0002-0713-6627]
dc.identifier.orcidPotti, H. [0000-0002-0800-9902]
dc.identifier.orcidRuggeri, T.A. [0000-0001-9941-1966]
dc.identifier.orcidWhite, M.J. [0000-0001-5474-4580]
dc.identifier.urihttp://hdl.handle.net/2440/131830
dc.language.isoen
dc.publisherElsevier
dc.rights©2021 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
dc.source.urihttps://doi.org/10.1016/j.physletb.2021.136412
dc.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
dc.title.alternativeEvidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at root s=13 TeV with the ATLAS detector
dc.typeJournal article
pubs.publication-statusPublished

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