Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Standard model 1 (electroweak/bosons)

T 38.2: Talk

Tuesday, March 5, 2024, 16:15–16:30, Geb. 30.23: 2/0

Studies of the τ polarization in leptonic Z → τ⁻ τ⁺ decays using √s=13 TeV pp collision data — •Sabrina Saul, Florian Harz, Adrián Álvarez Fernández, and Stefan Tapprogge — Johannes-Gutenberg Universität Mainz, Institut für Physik

This study examines the leptonic τ decays from Z boson resonant production in pp collisions at LHC with √s=13 TeV measured with the ATLAS detector. As a result of the electroweak interaction, τ leptons from Z decays are polarized and the degree of polarization is connected to the weak mixing angle. Kinematic properties of the visible decay products of the τ (muons and electrons in this case) allow to infer the polarization of the parent particle. First, the kinematic properties are investigated without detector effects. Second, detector effects such as resolution, as well as the impact of cuts necessary to suppress background are studied. This contribution will summarize the current status and outlook of the study.

Keywords: Weak mixing angle; ATLAS experiment; Z decay; polarisation; tau decay