Observation of τ lepton pair production in ultraperipheral lead-lead collisions at √s_NN = 5.02 TeV

Авторы: Belyaev Andrey, Boos E.E., Bunichev V., Ershov A.A., Khein L., Kodolova O.L., Korotkikh V.L., Obraztsov S.V., Petrushanko S.V., Savrin V.I., Snigirev A.M., Vardanyan I., CMS Collaboration
Журнал: Physical Review Letters
Том: 131
Год издания: 2023
Издательство: American Physical Society
Местоположение издательства: United States
Номер статьи: 151803
DOI: 10.1103/PhysRevLett.131.151803
Аннотация: 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−1 collected by the CMS experiment at a center-of-mass energy per nucleon pair of √sNN=5.02 TeV. The γγ→τ+τ− process is observed for τ+τ− events with a muon and three charged hadrons in the final state. The measured fiducial cross section is σ(γγ→τ+τ−)=4.8±0.6(stat)±0.5(syst) μb, where the second (third) term corresponds to the statistical (systematic) uncertainty in σ(γγ→τ+τ−) in agreement with leading-order QED predictions. Using σ(γγ→τ+τ−), we estimate a model-dependent value of the anomalous magnetic moment of the τ lepton of aτ=0.001+0.055−0.089.
Добавил в систему: Петрушанко Сергей Владимирович

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