CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2023-413
Title	Measuring tau g-2 using ATLAS Pb+Pb collisions
Author(s)	Stanek-Maslouska, Weronika (Deutsches Elektronen-Synchrotron (DE))
Corporate author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Submitted by	[email protected] on 07 Sep 2023
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ultra-peripheral heavy-ion collisions ; tau leptons ; tau g-2 ; magnetic moment ; EWEAK ; HEAVYIONS
Abstract	Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to photon-induced processes. Measurements of photon-induced production of tau lepton pairs can be used to constrain the tau lepton's anomalous magnetic dipole moment (g-2). A recent ATLAS measurement using muonic decays of tau leptons in association with electrons and tracks is presented. This provides one of the most stringent limits on g-2 of the tau lepton to date.