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Accès ouvert déclaré 2020 article

Study of the $\psi_2 (3823)$ and $\chi_{c1}(3872)$ states in $B^+ \to ( J\psi\pi^+\pi^-)K^+$ decays

62Citations signalées, ce qui n’est pas une note de qualité
107Institutions déclarées
18Pays d’affiliation déclarés

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Le résumé fourni par la source

Abstract: The decays B+→ J/ψπ+π−K+ are studied using a data set corresponding to an integrated luminosity of 9 fb−1 collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate ψ2(3823), χc1(3872) and ψ(2S) states are reported. The values areBB+→ψ23823K+×Bψ23823→J/ψπ+π−BB+→χc13872K+×Bχc13872→J/ψπ+π−=3.56±0.67±0.11×10−2, BB+→ψ23823K+×Bψ23823→J/ψπ+π−BB+→ψ2SK+×Bψ2S→J/ψπ+π−=1.31±0.25±0.04×10−3, BB+→χc13872K+×Bχc13872→J/ψπ+π−BB+→ψ2SK+×Bψ2S→J/ψπ+π−=3.69±0.07±0.06×10−2, where the first uncertainty is statistical and the second is systematic. The decay of B+→ ψ2(3823)K+ with ψ2(3823) → J/ψπ+π− is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the ψ2(3823), χc1(3872) and ψ(2S) states are measured to be mχc13872−mψ23823=47.50±0.53±0.13MeV/c2, mψ23823−mψ22S=137.98±0.53±0.14MeV/c2, mχc13872−mψ22S=185.49±0.06±0.03MeV/c2, resulting in the most precise determination of the χc1(3872) mass. The width of the ψ2(3823) state is found to be below 5.2 MeV at 90% confidence level. The Breit-Wigner width of the χc1(3872) state is measured to be Γχc13872BW=0.96−0.18+0.19±0.21MeV which is inconsistent with zero by 5.5 standard deviations.

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Les institutions déclarées

National Institute for Subatomic PhysicsUniversity of ZurichUniversity of LiverpoolUniversidade de Santiago de CompostelaUniversity of BristolCentre National de la Recherche ScientifiqueUniversité Clermont AuvergneInstitut National de Physique Nucléaire et de Physique des ParticulesUniversity of MichiganIstituto Nazionale di Fisica Nucleare, Sezione di MilanoUniversity of CincinnatiTU Dortmund UniversityEuropean Organization for Nuclear ResearchUniversity of GlasgowUniversitat de BarcelonaUniversity of ManchesterPetersburg Nuclear Physics InstituteUniversidade Federal do Rio de JaneiroUniversité Paris-SaclayLaboratoire de Physique des 2 Infinis Irène Joliot-CurieIstituto Nazionale di Fisica Nucleare, Sezione di FirenzeÉcole Polytechnique Fédérale de LausanneIstituto Nazionale di Fisica Nucleare, Sezione di FerraraHeidelberg UniversityKurchatov InstituteInstitute for High Energy PhysicsSyracuse UniversityYandex School of Data AnalysisAix-Marseille UniversitéCentre de physique des particules de MarseilleUniversity of WarwickImperial College LondonCentro Brasileiro de Pesquisas FísicasIstituto Nazionale di Fisica Nucleare, Sezione di GenovaNational University of Science and TechnologyRWTH Aachen UniversityIstituto Nazionale di Fisica Nucleare, Sezione di PisaNational Centre for Nuclear ResearchIstituto Nazionale di Fisica Nucleare, Sezione di CagliariIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiDélégation Paris 7Université Paris CitéSorbonne UniversitéSorbonne Paris CitéLaboratoire de Physique Nucléaire et de Hautes ÉnergiesLomonosov Moscow State UniversityIstituto Nazionale di Fisica Nucleare, Sezione di PadovaIstituto Nazionale di Fisica Nucleare, Sezione di BolognaUniversity of CambridgeInstitute of Nuclear Physics, Polish Academy of SciencesWuhan UniversityUniversity of BirminghamUniversity of OxfordIstituto Nazionale di Fisica Nucleare, Sezione di Roma IMassachusetts Institute of TechnologyNational Research University Higher School of EconomicsUniversity of Maryland, College ParkInstitute for Nuclear ResearchIstituto Nazionale di Fisica Nucleare, Sezione di Milano BicoccaUniversity of Chinese Academy of SciencesIstituto Nazionale di Fisica Nucleare, Roma Tor VergataInstitute of High Energy PhysicsUniversité Savoie Mont BlancUniversité Grenoble AlpesTsinghua UniversityUniversity of EdinburghHoria Hulubei National Institute for R and D in Physics and Nuclear EngineeringLos Alamos National LaboratoryIstituto Nazionale di Fisica Nucleare, Sezione di BariMaastricht UniversityAGH University of KrakowCentral China Normal UniversityInstitute for Nuclear ResearchUniversity College DublinKharkiv Institute of Physics and TechnologyRutherford Appleton LaboratoryMonash UniversitySiberian Branch of the Russian Academy of SciencesBudker Institute of Nuclear PhysicsPeking UniversityState Key Laboratory of Nuclear Physics and TechnologyUniversitat de ValènciaInstituto de Física CorpuscularPontifícia Universidade Católica do Rio de JaneiroUniversity Frères Mentouri Constantine 1National Research Tomsk State UniversityTomsk Polytechnic UniversitySouth China Normal UniversityUniversity of RostockUniversidad Nacional de ColombiaUniversity of BonnUniversity of GroningenUniversity of FerraraUniversity of BolognaUniversity of GenoaUniversity of PisaUniversity of CagliariUniversity of Rome Tor VergataUniversity of BasilicataMax Planck Institute for Nuclear PhysicsNovosibirsk State UniversityUniversity of Milano-BicoccaUniversity of PaduaUniversity of MilanUniversity of UrbinoUniversitat Ramon LlullP.N. Lebedev Physical Institute of the Russian Academy of Sciences

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Les sujets associés

Particle physics theoretical and experimental studiesQuantum Chromodynamics and Particle InteractionsBlack Holes and Theoretical Physics

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