Search for CP violation in D_0→K^0_S K^0_S decays in proton-proton collisions at √s = 13 TeV

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.

Авторы: 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: European Physical Journal C
Том: 84
Год издания: 2024
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 1264
DOI: 10.1140/epjc/s10052-024-13244-0
Аннотация: A search is reported for charge-parity CP violation in D^0 → K^0_S K^0_S decays, using data collected in proton–proton collisions at √s = 13 TeV recorded by the CMS experiment in 2018. The analysis uses a dedicated data set that corresponds to an integrated luminosity of 41.6 fb−1, which consists of about 10 billion events containing a pair of b hadrons, nearly all of which decay to charm hadrons. The flavor of the neutral D meson is determined by the pion charge in the reconstructed decays D^∗+ → D^0 π+ and D^∗− → D^0 π−. The CP asymmetry in D^0 → K^0_S K^0_S is measured to be A_CP(K^0_S K^0_S) = (6.2 ± 3.0 ± 0.2 ± 0.8)%, where the three uncertainties represent the statistical uncertainty, the systematic uncertainty, and the uncertainty in the measurement of the CP asymmetry in the D^0 → K^0_S π+ π− decay. This is the first CP asymmetry measurement by CMS in the charm sector as well as the first to utilize a fully hadronic final state.
Добавил в систему: Клюхин Вячеслав Иванович

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Search for CP violation in D_0→K^0_S K^0_S decays in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья

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