Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 49: Eingeladene Vorträge (Invited Topical Talks) III

T 49.1: Eingeladener Vortrag

Mittwoch, 17. März 2021, 14:00–14:30, Audimax

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A walk through H → τ τ in the CMS experiment — •Hale Sert — RWTH Aachen University, Experimental Physics Institute 3B, Aachen, Germany

The direct coupling of Higgs bosons to fermions is the necessary probe to understand the mass generation of the fermions. The tau lepton decay of the Higgs boson, with the second largest branching ratio, was the first one observed in combination of the CMS and ATLAS data collected at √s=7 TeV and √s=8 TeV. The first observation by the CMS experiment was achieved after inclusion of the 2016 data with L=35.9 fb⁻¹ at √s=13 TeV. Since then, H → ττ has been observed in various production modes. Cross sections, the signal strength µ, defined as the ratio of the observed cross section to the Standard Model expectation, and the couplings to bosons and fermions, κ_v and κ_f, have been determined, and found in agreement with the predictions of the Standard Model. This decay has been recently used to investigate the CP structure in the Yukawa coupling. In parallel, the heavier Higgs bosons decaying in tau leptons have been searched in several channels. This talk will guide you through the progress from the discovery of H → τ τ to up-to-date results obtained in Run 2 data with L=137 fb⁻¹ collected at √s=13 TeV in the CMS experiment.