Test of lepton flavor universality in semileptonic B+_c meson decays in proton-proton collisions at √s = 13 TeV

Авторы: Belyaev A.V., Boos E., 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: Physical Review D
Том: 111
Год издания: 2025
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: L051102
DOI: 10.1103/PhysRevD.111.L051102
Аннотация: A measurement of the ratio of branching fractions R(J/ψ) = B(B+_c → J/ψ τ+ ν_τ) = B(B+_c → J/ψ μ+ ν_μ) in the J/ψ → μ+ μ−, τ+ → μ+ ν_μ ν¯_τ decay channel is presented. This measurement uses a sample of proton-proton collision data collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2018, corresponding to an integrated luminosity of 59.7 fb^−1. The measured ratio, R(J/ψ) = 0.17+0.18−0.17(stat) + 0.21−0.22(syst) + 0.19−0.18 (theo) = 0.17 +- 0.33, agrees with the value of 0.2582 +- 0.0038 predicted by the standard model, which assumes lepton flavor universality. By testing lepton flavor universality, this measurement is a probe of new physics using B+_c mesons, which are currently only produced at the LHC.
Добавил в систему: Клюхин Вячеслав Иванович

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