CERN Accelerating science

ATLAS Note
Report number	ATL-PHYS-PROC-2023-076
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
Publication	2023
Imprint	30 Oct 2023
Number of pages	6
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	At the Large Hadron Collider (LHC), relativistic heavy-ion beams generate a large flux of equivalent photons, which can lead to photon-induced reactions. By measuring the production of tau lepton pairs through photon-induced processes, it becomes possible to set constraints on the anomalous magnetic dipole moment (g-2) of the tau lepton. A recent study conducted by the ATLAS experiment involved observing the muonic decays of tau leptons in conjunction with electrons and particle tracks. This study has yielded one of the most stringent constraints on the g-2 of the tau lepton to date.