%0 Journal Article
%T Evidence 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
%A ATLAS Collaboration (Aad, G. et al
%A Aparisi Pozo, J. A.
%A Bailey, A. J.
%A Cabrera Urban, S.
%A Cardillo, F.
%A Castillo, F. L.
%A Castillo Gimenez, V.
%A Costa, M. J.
%A Escobar, C.
%A Estrada Pastor, O.
%A Fiorini, L.
%A Fullana Torregrosa, E.
%A Fuster, J.
%A Garcia, C.
%A Garcia Navarro, J. E.
%A Gonzalez de la Hoz, S.
%A Gonzalvo Rodriguez, G. R.
%A Guerrero Rojas, J. G. R.
%A Higon-Rodriguez, E.
%A Lacasta, C.
%A Lozano Bahilo, J. J.
%A Mamuzic, J.
%A Marti-Garcia, S.
%A Martinez Agullo, P.
%A Miralles Lopez, M.
%A Mitsou, V. A.
%A Moreno Llacer, M.
%A Navarro-Gonzalez, J.
%A Poveda, J.
%A Prades Ibañez, A.
%A Rodriguez Bosca, S.
%A Ruiz-Martinez, A.
%A Sabatini, P.
%A Salt, J.
%A Sayago Galvan, I.
%A Soldevila, U.
%A Sanchez, J.
%A Torro Pastor, E.
%A Valero, A.
%A Valls Ferrer, J. A.
%A Villaplana Perez, M.
%A Vos, M.
%J Physics Letters B
%D 2021
%V 819
%I Elsevier
%@ 0370-2693
%G English
%F ATLASCollaborationAad_etal2021
%O WOS:000679259200033
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4922), last updated on Thu, 12 Aug 2021 09:22:01 +0000
%X A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass m(ll) < 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 -> ll(gamma) 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 -> ll(gamma) branching ratio for m(ll) < 30 GeV is determined to be 8.7(-2.7)(+2.8) fb.
%R 10.1016/j.physletb.2021.136412
%U https://arxiv.org/abs/2103.10322
%U https://doi.org/10.1016/j.physletb.2021.136412
%P 136412-22pp