%0 Electronic Article
%T Observation of τ lepton pair production in ultraperipheral lead-lead collisions at √{s<sub>NN</sub>} = 5.02 TeV
%N arXiv:2206.05192
%M PUBDB-2022-04494
%M arXiv:2206.05192
%M CMS-HIN-21-009
%M CERN-EP-2022-098
%D 2022
%Z Submitted to Physical Review Letters. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-009 (CMS Public Pages)
%X We present an observation of photon-photon production of τ lepton pairs in ultraperipheral lead-lead collisions. The measurement is based on a data sample with an integrated luminosity of 404 μb<sup>−1</sup> collected by the CMS experiment at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The γγ→τ<sup>+</sup>τ<sup>−</sup> process is observed for ττ events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ(γγ→τ<sup>+</sup>τ<sup>−</sup>) = 4.8± 0.6 (stat) ± 0.5 (syst) μb, in agreement with leading-order QED predictions. Using σ(γγ→τ<sup>+</sup>τ<sup>−</sup>), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of a<sub>τ</sub> = 0.001<sup>+0.055</sup><sub>−0.089</sub> at a 68
%K higher-order: 0 (INSPIRE)
%K lepton: pair production (INSPIRE)
%K peripheral (INSPIRE)
%K muon (INSPIRE)
%K quantum electrodynamics (INSPIRE)
%K magnetic moment (INSPIRE)
%K CMS (INSPIRE)
%K experimental results (INSPIRE)
%K photon photon --> tau+ tau- (INSPIRE)
%K 5020 GeV-cms/nucleon  (INSPIRE)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2022-04494
%U https://bib-pubdb1.desy.de/record/481628