Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 78: Electroweak Interactions II

T 78.3: Talk

Thursday, March 18, 2021, 16:30–16:45, Tc

Measurement of aτ at the ATLAS Experiment — •Birte Sauer, Jakub Kremer, and Matthias Schott — Johannes Gutenberg-Unitersity Mainz

The anomalous magnetic moment, being the difference to the value predicted by Dirac’s theory, is used since long to probe the limits of the Standard Model. Both the electronic and muonic anomalous magnetic moment have been studied to a great extent, while the anomalous magnetic moment of tau lepton is missing a precise measurement. The short lifetime of tauons makes it experimentally challenging to measure their properties. This talk discusses the sensitivity of the γγ→ττ process in ultraperipheral Pb+Pb collisions on the anomalous magnetic (aτ) and electric (dτ) moments of τ lepton at the LHC. We also present preliminary results on this measurement using the di-muon final state with data collected by the ATLAS detector with a special focus on the relevant detector performance.