Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 5: Higgs decay in fermions I

T 5.1: Talk

Monday, March 15, 2021, 16:00–16:15, Te

Evidence for Higgs boson decays to muons — Tobias Kramer, Peter Schleper, •Oliver Rieger, and Torben Lange — Universität Hamburg

A search for Higgs boson decays to muons in the top quark-antiquark pair associated Higgs boson production is presented. The analysis serves as a part of a combined result based on four complementary analysis channels which address the ggH, VBF, VH, and ttH Higgs boson production modes. The results are presented using proton-proton collision data at 13 TeV, corresponding to an integrated luminosity of 137 fb⁻¹ recorded by the CMS experiment. After the definition of an exclusive ttH production channel, events are classified into subcategories using boosted decision trees. The signal is extracted by a simultaneous fit to the dimuon mass distribution in all BDT-based subcategories, where the background is estimated directly from data. The combination of all four Higgs boson production channels observes an excess of events at m_H=125.38 GeV with a significance of 3.0 standard deviations, where the expectation for the SM Higgs boson is 2.5. This result constitutes the first evidence for decays of the Higgs boson to second generation fermions.