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T: Fachverband Teilchenphysik

T 35: Electroweak Physics I (Weak Mixing Angle, Tau Production)

T 35.3: Vortrag

Dienstag, 1. April 2025, 16:45–17:00, VG 2.103

Determination of the tau polarization in fully leptonic 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 mean to extract the weak mixing angle. The study considers the fully leptonic final state of the Z→ τ⁺τ⁻ decay channel and assesses its sensitivity to the tau polarization. This is accomplished by fitting templates to the visible mass derived from decays of purely left-handed or right-handed taus. This method can be verified using simulated samples. 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