Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 5: Electroweak Interactions (Exp.) 1
T 5.7: Vortrag
Montag, 21. März 2022, 17:50–18:05, T-H18
Measurement of the anomalous magnetic moment of the tau lepton in heavy ion collisions with the ATLAS experiment — •Leonie Hermann, Valerie Lang, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg
The anomalous magnetic moment of leptons is an important property in the Standard Model of particle physics and is highly sensitive to new physics beyond the Standard Model. At the LHC the anomalous magnetic moment of the tau lepton (aτ) can be measured in ultra-peripheral PbPb collisions exploiting the large photon flux via the partonic process γγ → ττ. Anomalous values of aτ change the total cross-section and differential cross-sections in various kinematic observables. The analysis is based on PbPb collision data with a center-of-mass energy of 5.02 TeV collected with the ATLAS experiment in 2018 with an integrated luminosity of 1.33 nb−1. Events with one leptonically decaying tau lepton, i.e. an electron or muon in the final state, and the other decaying hadronically or leptonically are exploited in the analysis. The sensitivity of the measurement is determined by a maximum likelihood fit to the number of selected events, the shape of kinematic distributions and a combination of both in several signal regions corresponding to different final states. Studies of the expected sensitivity quantified by the length of the confidence interval for aτ will be presented.