Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

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

T 35.6: Vortrag

Dienstag, 1. April 2025, 17:30–17:45, VG 2.103

Differential measurements of γγ→ττ and constraints on τ-lepton electromagnetic moments in ultra-peripheral Pb+Pb collisions with ATLAS — •Weronika Stanek-Maslouska — Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

At the Large Hadron Collider (LHC), relativistic heavy-ion collisions produce a significant flux of equivalent photons, enabling photon-induced interactions. By studying the production of tau lepton pairs in these processes, constraints can be placed on the anomalous magnetic dipole moment (g-2) and electric dipole moment (EDM) of the tau lepton. Building on the observation of this process with ATLAS, which analyzed muonic decays of tau leptons in conjunction with electrons and particle tracks, we perform first unfolded differential cross section measurements. Additionally, new measurements of the tau lepton electromagnetic moments are performed. These results represent a substantial advancement in measuring photon-induced tau lepton pairs and probing the electromagnetic properties of the tau lepton using heavy-ion collisions.

Keywords: tau lepton; anomalous magnetic moment; precision measurement; ultraperipheral heavy-ion collisions; electroweak interaction