Measurement of the CP-violating phase phi(s) in the B-s(0) -> J/psi phi(1020) -> mu(+)mu-K+K- channel in proton-proton collisions at √s=13 TeV
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Sirunyan, A.M.; Cabrillo Bartolomé, José Ibán; Calderón Tazón, Alicia; Chazin Quero, Bárbara; Duarte Campderros, Jorge; Fernández García, Marcos; Fernández Manteca, Pedro José; García Alonso, Andrea; Gómez Gramuglio, Gervasio; Martínez Rivero, Celso; Martínez Ruiz del Árbol, Pablo; Matorras Weinig, Francisco; Piedra Gómez, Jonatan; Prieëls, Cedric; Ricci-Tam, Francesca Shun-Ning Annarosa; Rodrigo Anoro, Teresa; Ruiz Jimeno, Alberto; Russo, Lorenzo; Scodellaro, Luca; [et al.]Fecha
2021-05-10Derechos
Attribution 4.0 International
Publicado en
Physics Letters B, 2021, 816, 136188
Editorial
Elsevier
Palabras clave
CMS
Physics
Oscillations
B physics
Resumen/Abstract
The CP-violating weak phase φsand the decay width difference sbetween the light and heavy B0smass eigenstates are measured with the CMS detector at the LHC in a sample of 48 500reconstructed B0s→J/ψφ(1020) →μ+μ−K+K−events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4fb−1, collected in proton-proton collisions at √s=13 TeVin 2017–2018. To extract the values of φsand s, a time-dependent and flavor-tagged angular analysis of the μ+μ−K+K−final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields φs=−11 ±50 (stat)±10 (syst)mradand s=0.114 ±0.014 (stat)±0.007 (syst)ps−1, in agreement with the standard model predictions. When combined with the previous CMS measurement at √s=8 TeV, the following values are obtained: φs=−21 ±44 (stat)±10 (syst)mrad, s=0.1032 ±0.0095 (stat)±0.0048 (syst)ps−1, a significant improvement over the 8TeVresult.
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