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Accès ouvert déclaré 2023 article

Improved measurement of $CP$ violation parameters in $B^0_s\\to J/\\psi K^{+}K^{-}$ decays in the vicinity of the $\\phi(1020)$ resonance

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79Institutions déclarées
18Pays d’affiliation déclarés

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Le résumé fourni par la source

The decay-time-dependent $CP$ asymmetry in $B^0_s\\to J/\\psi(\\to \\mu^{+}\\mu^{-}) K^{+}K^{-}$ decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 $fb^{-1}$, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 $B^{0}_{s}$ signal decays with an invariant $K^{+}K^{-}$ mass in the vicinity of the $\\phi(1020)$ resonance, the $CP$-violating phase $\\phi_s$ is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the $B^0_s$-$\\bar{B}^0_s$ system, $\\Delta\\Gamma_s$, and the difference of the average $B^0_s$ and $B^0$ meson decay widths, $\\Gamma_s-\\Gamma_d$. The values obtained are $\\phi_s = \\ -0.039 \\pm 0.022 \\pm 0.006$ rad, $\\Delta\\Gamma_s = 0.0845 \\pm 0.0044 \\pm 0.0024 $ ps$^{-1}$ and $\\Gamma_s-\\Gamma_d = -0.0056 ^{+ 0.0013}_{-0.0015} \\pm 0.0014$ ps$^{-1}$, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase $\\phi_s$ is also measured independently for each polarization state of the $K^{+}K^{-}$ system and shows no evidence for polarization dependence.

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Les institutions déclarées

University of CagliariUniversity of WarwickUniversity of LiverpoolUniversidade de Santiago de CompostelaExcellence Cluster OriginsUniversity of BristolBristol Robotics LaboratoryAGH University of KrakowUppsala UniversityUniversitat de ValènciaEuropean Organization for Nuclear ResearchUniversity of MichiganNational Centre for Nuclear ResearchUniversity of CincinnatiUniversity of GlasgowUniversity of ManchesterManchester UniversityLaboratoire de Physique Nucléaire et de Hautes ÉnergiesLaboratoire de Physique des 2 Infinis Irène Joliot-CurieUniversity of PaduaUniversity of MilanUniversity of ZurichSyracuse UniversityUniversity of Rome Tor VergataCentre de physique des particules de MarseilleMassachusetts Institute of TechnologyLaboratoire Leprince-RinguetUniversity of OxfordScience OxfordLaboratoire d’Annecy de Physique des ParticulesKharkiv Institute of Physics and TechnologyÉcole Polytechnique Fédérale de LausanneUniversity of PisaUniversity of BasilicataUniversity of FlorencePontifícia Universidade Católica do Rio de JaneiroUK Astronomy Technology CentreUniversity of EdinburghUniversity of CambridgeBridge UniversityScuola Normale SuperioreUniversity of UrbinoUniversidad de AlcaláUniversity of BirminghamRutherford Appleton LaboratoryInstitute of Nuclear Physics, Polish Academy of SciencesWuhan University of TechnologyWuhan University of Science and TechnologyImperial College LondonMaastricht UniversityUniversity of FerraraMonash UniversityUniversity of Maryland, College ParkLanzhou UniversityKey Laboratory of Guangdong ProvinceSouth China Normal UniversityUniversity of Milano-BicoccaUniversity of BolognaUniversity of GenoaUniversidad Nacional de ColombiaEötvös Loránd UniversityUniversity of BonnInstitute for Nuclear ResearchUniversidade da CoruñaIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaHoria Hulubei National Institute for R and D in Physics and Nuclear EngineeringUniversitat de BarcelonaCracow University of TechnologyLos Alamos National LaboratoryLos Alamos National Security (United States)Universidade de BrasíliaHunan UniversityDirection des EnergiesCentral South UniversityUniversidade Federal do Triângulo MineiroUniversity of GroningenUniversité Sorbonne NouvelleSorbonne UniversitéUniversity of Bari Aldo Moro

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Les sujets associés

Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsComputational Physics and Python Applications

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