Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 38: Standard model 1 (electroweak/bosons)

T 38.1: Talk

Tuesday, March 5, 2024, 16:00–16:15, Geb. 30.23: 2/0

Determination of the tau polarization in hadronic Z→τ⁺τ⁻ decays from pp collisions at the ATLAS detector — •Florian Harz, Adrián Álvarez Fernández, and Stefan Tapprogge — Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany

The Z boson arises from the unification of the electromagnetism and weak forces, coupling differently to left- and right-handed particles as indicated by the effective weak mixing angle. Precisely measuring the tau polarization in Z→τ⁺τ⁻ decays provides a means to extract the weak mixing angle. This is accomplished by fitting templates to sensitive kinematic observables derived from decays of purely left-handed or right-handed taus. This method can be verified using simulated samples. The study considers various hadronic tau decay channels and assesses their sensitivity to the tau polarization. The status of these studies is presented, highlighting their potential application to real data, particularly focusing on proton-proton data collected at the ATLAS detector.

Keywords: Polarization; Tau decays; Weak mixing angle; ATLAS; LHC