CMS-PAS-SMP-23-005

CMS-PAS-SMP-23-005
Observation of $\gamma\gamma\rightarrow\tau\tau$ in proton-proton collisions and limits on the anomalous electromagnetic moments of the $\tau$ lepton
CMS Collaboration
12 March 2024

Abstract: The photon-induced production of a pair of $\tau$ leptons, $\gamma\gamma\rightarrow\tau\tau$ , is observed for the first time in proton-proton collisions. The observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb $^{-1}$ . Events with a small number of tracks close to the di- $\tau$ vertex are selected to isolate photon-induced processes. Limits on the anomalous electromagnetic moments of the $\tau$ lepton originating from potential new physics effects on the $\gamma\tau\tau$ vertex are also set.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Accepted by ROPP. The superseded preliminary plots can be found here.

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