EPJ Web Conf.
Volume 276, 2023The 20th International Conference on Strangeness in Quark Matter (SQM 2022)
|Number of page(s)||4|
|Published online||01 March 2023|
Observation of the γ γ → τ+τ− production in ultraperipheral PbPb collisions with the CMS experiment
Department of Physics and Astronomy, The University of Kansas,
Malott Hall, 1251 Wescoe Hall Dr.,
* e-mail: firstname.lastname@example.org
Published online: 1 March 2023
We report the observation of the photon-induced γγ → τ+τ− production based on a data sample of 404 μb−1 collected by the CMS experiment at a per nucleon center-of-mass energy of 5.02 TeV. The cross section is measured in a fiducial phase space region via the decay process involving one muon and three charged hadrons, and is found to be σ(γγ → τ+τ−) = 4.8 ± 0.6 (stat) ± 0.5 (syst) μb, in agreement with leading-order quantum electrodynamics predictions. The σ(γγ → τ+τ−) measurement is used to determine the anomalous magnetic moment of the τ lepton aτ , which is currently poorly constrained.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
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