Observation of γγ→ττ in proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton

Belyaev, A.V.; Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Gribushin, A.; Klyukhin, V.; Kodolova, O.; Obraztsov, S.; Petrushanko, S.V.; Savrin, V.; Snigirev, A.; CMS, C.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 октября 2024 г.

Авторы: Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Obraztsov S., Petrushanko S.V., Savrin V., Snigirev A., CMS Collaboration
Журнал: Reports on Progress in Physics
Том: 87
Год издания: 2024
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 107801
DOI: 10.1088/1361-6633/ad6fcb
Аннотация: The production of a pair of τ leptons via photon–photon fusion, γγ → ττ, is observed for the first time in proton–proton collisions, with a significance of 5.3 standard deviations. This 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 pair of τ leptons produced via photon–photon fusion are selected by requiring them to be back-to-back in the azimuthal direction and to have a minimum number of charged hadrons associated with their production vertex. The τ leptons are reconstructed in their leptonic and hadronic decay modes. The measured fiducial cross section of γγ → ττ is σ^fid_obs = 12.4+3.8−3.1 fb. Constraints are set on the contributions to the anomalous magnetic moment (a_τ) and electric dipole moments (d_τ) of the τ lepton originating from potential effects of new physics on the γττ vertex: aτ = 0.0009+0.0032−0.0031 and |d_τ| < 2.9 × 10^−17 e cm (95% confidence level), consistent with the standard model.
Добавил в систему: Клюхин Вячеслав Иванович

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Observation of γγ→ττ in proton-proton collisions and limits on the anomalous electromagnetic moments of the τ leptonстатья Исследовательская статья

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