Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 70: Higgs: Decay into fermions II

T 70.1: Talk

Thursday, April 2, 2020, 16:30–16:45, H-HS I

Tau decay mode splitting in the semi-leptonic final state of the H → τ τ coupling measurement at ATLAS — •Lara Katharina Schildgen, Philip Bechtle, Klaus Desch, Christian Grefe, Michael Hübner, and Peter Wagner for the ATLAS collaboration — University of Bonn

The Higgs decay to fermions plays an important role to gain a deeper understanding of the coupling properties of the Higgs. Due to its relatively high branching ratio and its distinct signatures, the decay of the Higgs boson to a tau lepton pair is a unique channel to access the Higgs-Yukawa coupling to fermions and is the first fermionic channel which has been observed by ATLAS and CMS with a significance exceeding 5σ.

Because of its short lifetime, the tau lepton decays before reaching the detectors and is therefore reconstructed by its decay products. The reconstruction algorithm for hadronically decaying taus used in ATLAS for Run-2 benefits from an improved tau decay mode classification and higher energy resolution.

The presentation outlines the main effects of tau decay mode splitting in the H → τ τ coupling measurement in the semi-leptonic final state using the full Run-2 dataset collected at a centre-of-mass energy of 13 TeV.