Speaker
Description
There is a two sigma discrepancy between the standard model predictions and the experimental values of the anomalous magnetic moment of the muon ($a_{\mu}$). This difference suggests the possibility of beyond the standard model physics. The tau lepton, $\tau$, is 16 times more massive than the muon, $\mu$.
Measuring $a_{\tau}$ would be an even better test of the standard model, since sensitivity to new physics is expected to be proportional of the lepton's mass squared. Such a measurement is complicated by the short $\tau$ lifetime. A theoretical analysis done by Beresford and Liu \cite{Beresford:2019gww} using Monte Carlo data shows that measurement of the $a_{\tau}$ is possible in ultra peripheral collisions. We propose measuring $a_{\tau}$ using existing Pb-Pb data at $\sqrt{s_{NN}} = 5.02 $ TeV from the CMS detector. With this data we hope to reduce uncertainty by a factor of 3 over existing measurements of $a_{\tau}$.
| Type of contribution | Oral contribution (10 minutes) |
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