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Test of lepton flavor universality in B±→K±μ+μ− and B±→K±e+e− decays in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или ScopusДата последнего поиска статьи во внешних источниках: 10 июля 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: 077802
- DOI: 10.1088/1361-6633/ad4e65
- Аннотация: A test of lepton flavor universality in B± → K±μ+μ− and B± → K±e+e− decays, as well as a measurement of differential and integrated branching fractions of a nonresonant B± → K±μ+μ− decay are presented. The analysis is made possible by a dedicated data set of proton-proton collisions at √s = 13 TeV recorded in 2018, by the CMS experiment at the LHC, using a special high-rate data stream designed for collecting about 10 billion unbiased b hadron decays. The ratio of the branching fractions B(B± → K±μ+μ−) to B(B± → K±e+e−) is determined from the measured double ratio R(K) of these decays to the respective branching fractions of the B± → J/ψK± with J/ψ → μ+μ− and e+e− decays, which allow for significant cancellation of systematic uncertainties. The ratio R(K) is measured in the range 1.1 < q^2 < 6.0 GeV^2, where q is the invariant mass of the lepton pair, and is found to be R(K) = 0.78+0.47−0.23, in agreement with the standard model expectation R(K) ≈ 1. This measurement is limited by the statistical precision of the electron channel. The integrated branching fraction in the same q^2 range, B(B± → K±μ+μ−) = (12.42 ± 0.68) × 10^−8, is consistent with the present world-average value and has a comparable precision.
- Добавил в систему: Клюхин Вячеслав Иванович
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