Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Standard Model Physics III

T 68.4: Talk

Thursday, March 19, 2026, 17:00–17:15, KH 00.014

Sensitivity and background studies related to the measurement of the tau-lepton's anomalous magnetic moment in proton collisions with the ATLAS detector. — •Ruben Bies, Valerie Lang, and Markus Schumacher — University of Freiburg

Anomalous magnetic moments are a property of leptons that modify their behaviour in electromagnetic fields through higher order corrections in quantum field theory. These quantities have been measured with great precision for electrons and muons and have shown some tensions with the predictions in the Standard Model (SM). Measurements of the tau-lepton's anomalous magnetic moment are predicted to be most sensitive to beyond SM effects, but the tau-lepton's lifetime is too short for similar experiments as for electrons and muons. In recent years, measurements of the anomalous magnetic moment for the tau-lepton have been successfully performed using ultra-peripheral heavy-ion collisions as well as proton collisions at the Large Hadron Collider (LHC).

This presentation will outline the analysis strategy of the ATLAS collaboration to perform a measurement of the tau-lepton's anomalous magnetic moment in proton collisions using the datasets from the second and third running periods of the LHC. Initial studies on the selection optimization and improvements of the signal to background ratio, as well as first background estimates will be shown.

Keywords: anomalous magnetic moment; tau leptons