A search for the dimuon decay of the Standard Model Higgs boson with the ATLAS detector Aad, G. Aguilar Saavedra, Juan Antonio A search for the dimuon decay of the Standard Model (SM) Higgs boson is performed using data corresponding to an integrated luminosity of 139fb−1collected with the ATLAS detector in Run2 ppcollisions at √s=13TeV at the Large Hadron Collider. The observed (expected) significance over the background-only hypothesis for a Higgs boson with a mass of 125.09GeV is 2.0σ(1.7σ). The observed upper limit on the cross section times branching ratio for pp →H→μμis 2.2times the SM prediction at 95%confidence level, while the expected limit on a H→μμsignal 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 μ =1.2 ±0.6. 2021-03-10T11:56:01Z 2021-03-10T11:56:01Z 2020-12-03 info:eu-repo/semantics/article Aad, G., Abbott, B., Abbott, D. C., Abud, A. A., Abeling, K., Abhayasinghe, D. K., ... & Baldin, E. M. (2021). A search for the dimuon decay of the Standard Model Higgs boson with the ATLAS detector. Physics Letters B, 812, 135980. [https://doi.org/10.1016/j.physletb.2020.135980] http://hdl.handle.net/10481/67056 10.1016/j.physletb.2020.135980 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Elsevier