Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 69: Eingeladene Vorträge (Invited Topical Talks) IV

T 69.2: Eingeladener Vortrag

Donnerstag, 2. April 2020, 14:30–15:00, H-HS X

The decay of Higgs bosons to a pair of tau leptons in the CMS experiment — •Hale Sert — RWTH Aachen University, Experimental Physics Institute 3B, Aachen, Germany

Studies of Higgs bosons decaying into a tau lepton pair play a crucial role not only in understanding the standard model of particle physics (SM) but also in searching for physics beyond the SM. Since the tau leptons couple directly to the Higgs boson, the measurement of the coupling strength of the Higgs boson to tau leptons helps to prove the generation of fermion masses and to understand if the observed Higgs boson is the SM Higgs boson.

The H → τ τ process was first observed in combination of the CMS and ATLAS experiments with 5 fb−1 data collected in 2011 at √s=7 TeV and 20 fb−1 data collected in 2012 at √s=8 TeV. The first significant observation only by the CMS experiment was achieved after inclusion of the 2016 data, corresponding to an integrated luminosity of 35.9 fb−1 at a centre-of-mass energy of 13 TeV. The analysis strategies have been improved during Run 2 data-taking for example by estimating most of the background processes from data, by moving to a new tau identification method using deep neural networks and alternatively by using a new method based on neural networks classification to differentiate the individual signal and background processes.

In this talk, these improvements will be discussed and the results for the full Run 2 data corresponding an integrated luminosity of 137 fb−1 collected at a centre-of-mass energy of 13 TeV will be presented.

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