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Accès ouvert déclaré 2023 article

Precision Measurement of $CP$ Violation in the Penguin-Mediated Decay $Bs0\phi$

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86Institutions déclarées
18Pays d’affiliation déclarés

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Le résumé fourni par la source

A flavor-tagged time-dependent angular analysis of the decay B_{s}^{0}→ϕϕ is performed using pp collision data collected by the LHCb experiment at the center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb^{-1}. The CP-violating phase and direct CP-violation parameter are measured to be ϕ_{s}^{ss[over ¯]s}=-0.042±0.075±0.009 rad and |λ|=1.004±0.030±0.009, respectively, assuming the same values for all polarization states of the ϕϕ system. In these results, the first uncertainties are statistical and the second systematic. These parameters are also determined separately for each polarization state, showing no evidence for polarization dependence. The results are combined with previous LHCb measurements using pp collisions at center-of-mass energies of 7 and 8 TeV, yielding ϕ_{s}^{ss[over ¯]s}=-0.074±0.069 rad and |λ|=1.009±0.030. This is the most precise study of time-dependent CP violation in a penguin-dominated B meson decay. The results are consistent with CP symmetry and with the standard model predictions.

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Les institutions déclarées

National Institute for Subatomic PhysicsUniversity of WarwickUniversity of ZurichUniversity of LiverpoolUniversidade de Santiago de CompostelaUniversity of BristolUppsala UniversityUniversity of GlasgowCentre National de la Recherche ScientifiqueUniversité Clermont AuvergneInstitut National de Physique Nucléaire et de Physique des ParticulesEuropean Organization for Nuclear ResearchUniversity of MichiganSyracuse UniversityUniversity of CincinnatiIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiTU Dortmund UniversityUniversitat de BarcelonaUniversity of ManchesterUniversity of CambridgeDélégation Paris 7Université Paris CitéSorbonne UniversitéSorbonne Paris CitéLaboratoire de Physique Nucléaire et de Hautes ÉnergiesUniversidade Federal do Rio de JaneiroUniversité Paris-SaclayLaboratoire de Physique des 2 Infinis Irène Joliot-CuriePeking UniversityState Key Laboratory of Nuclear Physics and TechnologyIstituto Nazionale di Fisica Nucleare, Sezione di FirenzeIstituto Nazionale di Fisica Nucleare, Sezione di FerraraUniversity of Chinese Academy of SciencesIstituto Nazionale di Fisica Nucleare, Roma Tor VergataAix-Marseille UniversitéCentre de physique des particules de MarseilleÉcole PolytechniqueLaboratoire Leprince-RinguetUniversité Savoie Mont BlancHeidelberg UniversityÉcole Polytechnique Fédérale de LausanneCentro Brasileiro de Pesquisas FísicasUniversity of EdinburghRWTH Aachen UniversityIstituto Nazionale di Fisica Nucleare, Sezione di PisaNational Centre for Nuclear ResearchInstitute of High Energy PhysicsUniversitat Ramon LlullUniversity of PaduaInstitute of Nuclear Physics, Polish Academy of SciencesWuhan UniversityTsinghua UniversityImperial College LondonMaastricht UniversityUniversity of Maryland, College ParkIstituto Nazionale di Fisica Nucleare, Sezione di CagliariSouth China Normal UniversityIstituto Nazionale di Fisica Nucleare, Sezione di Milano BicoccaIstituto Nazionale di Fisica Nucleare, Sezione di BolognaIstituto Nazionale di Fisica Nucleare, Sezione di GenovaUniversity of OxfordInstitute for Nuclear ResearchHoria Hulubei National Institute for R and D in Physics and Nuclear EngineeringIstituto Nazionale di Fisica Nucleare, Sezione di BariUniversity of BirminghamLos Alamos National LaboratoryHunan UniversityCentral China Normal UniversityUniversity of GroningenMassachusetts Institute of TechnologyEötvös Loránd UniversityUniversity College DublinIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaRutherford Appleton LaboratoryMonash UniversityAGH University of KrakowIstituto Nazionale di Fisica Nucleare, Sezione di MilanoPontifícia Universidade Católica do Rio de JaneiroUniversity of BonnUniversitat de ValènciaInstituto de Física CorpuscularKharkiv Institute of Physics and TechnologyLanzhou UniversityIstituto Nazionale di Fisica Nucleare, Sezione di Roma IUniversidad Nacional de ColombiaMax Planck Institute for Nuclear Physics

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Les sujets associés

Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsNeutrino Physics Research

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