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The photon-induced production of a pair of tau leptons is observed in proton-proton collisions with data collected in Run-2 by the CMS detector at the CERN LHC. Signal events are identified thanks to their low track multiplicity around the di-tau vertex. These events are used to set constraints on the anomalous magnetic moment of the tau lepton, significantly improving previous measurements from the LEP era.
Chiara Perrina, Alina Kleimenova