Aaboud, M.Aad, G.Abbott, B.Abdinov, O.Abeloos, B.Abhayasinghe, D. K.Çetin, Serkant Ali2024-07-182024-07-1820210370-26931873-2445https://doi.org/10.1016/j.physletb.2020.135980https://hdl.handle.net/11411/8814A search for the dimuon decay of the Standard Model (SM) Higgs boson is performed using data corresponding to an integrated luminosity of 139 fb(-1) collected with the ATLAS detector in Run 2 pp collisions at root s = 13 TeV at the Large Hadron Collider. The observed (expected) significance over the background-only hypothesis for a Higgs boson with a mass of 125.09 GeV is 2.0 sigma (1.7 sigma). The observed upper limit on the cross section times branching ratio for pp -> H -> mu mu is 2.2 times the SM prediction at 95% confidence level, while the expected limit on a H -> mu mu signal assuming the absence (presence) of a SM signal is 1.1(2.0). The best-fit value of the signal strength parameter, defined as the ratio of the observed signal yield to the one expected in the SM, is mu = 1.2 +/- 0.6. (C) 2020 The Author(s). Published by Elsevier B.V.eninfo:eu-repo/semantics/openAccessLeading Order QcdGamma-GammaStrahlungProgramLibraryFusionHdecayMassLhcArticle2-s2.0-8511028391210.1016/j.physletb.2020.135980Q1812Q1WOS:000608167600020