Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 76: Higgs-Zerfälle in Bosonen

T 76.9: Talk

Thursday, March 28, 2019, 18:00–18:15, H04

Measurement of the H → τ τ coupling exploiting tau lepton decay mode classification in the semi-leptonic final state at ATLAS — •Lara Schildgen, Philip Bechtle, Klaus Desch, Christian Grefe, Michael Hübner, and Peter Wagner — 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 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 recently with a significance exceeding 5σ by ATLAS and CMS.

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 hadronic taus used in ATLAS for Run-2 benefits from an improved tau decay mode classification and higher energy resolution.

The presentation outlines the main aspects of exploiting the tau decay mode classification in the ongoing analysis for 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.