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Accès ouvert déclaré 2020 article

Strong constraints on the $b \to s\gamma$ photon polarisation from $B^0 \to K^{*0} e^+ e^-$ decays

39Citations signalées, ce qui n’est pas une note de qualité
107Institutions déclarées
17Pays d’affiliation déclarés

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Le résumé fourni par la source

Abstract: An angular analysis of the B0 → K*0e+e− decay is performed using a data sample corresponding to an integrated luminosity of 9 fb−1 of pp collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared (q2) interval between 0.0008 and 0.257 GeV2, where the rate is dominated by the B0 → K*0γ transition with a virtual photon. The fraction of longitudinal polarisation of the K*0 meson, FL, is measured to be FL = (4.4 ± 2.6 ± 1.4)%, where the first uncertainty is statistical and the second systematic. The ATRe observable, which is related to the lepton forward-backward asymmetry, is measured to be ATRe = −0.06 ± 0.08 ± 0.02. The AT2 and ATIm transverse asymmetries, which are sensitive to the virtual photon polarisation, are found to be AT2 = 0.11 ± 0.10 ± 0.02 and ATIm = 0.02 ± 0.10 ± 0.01. The results are consistent with Standard Model predictions and provide the world’s best constraint on the b → sγ photon polarisation.

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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 JaneiroLaboratoire de Physique des 2 Infinis Irène Joliot-CurieIstituto Nazionale di Fisica Nucleare, Sezione di FirenzeIstituto 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 MarseilleÉcole Polytechnique Fédérale de LausanneUniversity 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 PisaIstituto Nazionale di Fisica Nucleare, Sezione di CagliariLomonosov Moscow State UniversityIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiDélégation Paris 7Université Paris CitéSorbonne UniversitéSorbonne Paris CitéLaboratoire de Physique Nucléaire et de Hautes ÉnergiesUniversity of PaduaIstituto 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 BicoccaUniversitat Ramon LlullUniversity 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 EngineeringIstituto Nazionale di Fisica Nucleare, Sezione di BariLos Alamos National LaboratoryUniversity of GroningenMaastricht UniversityAGH University of KrakowInstitute for Nuclear ResearchUniversity College DublinKharkiv Institute of Physics and TechnologyIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaRutherford Appleton LaboratoryMonash UniversitySiberian Branch of the Russian Academy of SciencesBudker Institute of Nuclear PhysicsPeking UniversityState Key Laboratory of Nuclear Physics and TechnologyPontifícia Universidade Católica do Rio de JaneiroCentral China Normal UniversityUniversitat de ValènciaInstituto de Física CorpuscularNational Research Tomsk State UniversityTomsk Polytechnic UniversityNational Centre for Nuclear ResearchSouth China Normal UniversityUniversity of RostockUniversidad Nacional de ColombiaUniversity of BonnUniversity of Bari Aldo MoroUniversity 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 MilanUniversity of UrbinoHunan UniversityP.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 InteractionsHigh-Energy Particle Collisions Research

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