First Measurement of Time-Dependent C P Violation in the Flavor-Changing Neutral-Current Decay B 0 → K S 0 μ + μ −

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Abstract
A flavor-tagged time-dependent analysis of B 0 → K S 0 μ + μ − decays is performed across the full dimuon mass range excluding the J / ψ and ψ ( 2 S ) resonance regions. The analysis uses proton-proton collision data collected by the LHCb experiment in 2011–2018 at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fb − 1 . The C P violation parameters are determined to be C = − 0.13 ± 0.32 ± 0.04 , S = + 0.82 ± 0.29 ± 0.05 , where the first uncertainties are statistical and the second are systematic. The results are consistent with the standard model prediction. This is the first experimental study of time-dependent C P violation in b → s ℓ + ℓ − processes.
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  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
  • Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
  • Financiadora de Estudos e Projetos
  • Ministry of Science and Technology of the People's Republic of China
  • National Natural Science Foundation of China
  • Centre National de la Recherche Scientifique
  • Institut National de Physique Nucléaire et de Physique des Particules
  • Bundesministerium für Forschung, Technologie und Raumfahrt
  • Deutsche Forschungsgemeinschaft
  • Max-Planck-Gesellschaft
  • Instituto Nazionale di Fisica Nucleare
  • Nederlandse Organisatie voor Wetenschappelijk Onderzoek
  • Ministerstwo Edukacji i Nauki
  • Narodowe Centrum Nauki
  • Ministerul Cercetării, Inovării şi Digitalizării
  • Institutul de Fizică Atomică
  • Ministerio de Ciencia e Innovación
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • National Academy of Sciences of Ukraine
  • Science and Technology Facilities Council
  • Nuclear Physics
  • National Science Foundation
  • CERN
  • Karlsruhe Institute of Technology
  • Deutsches Elektronen-Synchrotron
  • Centro Svizzero di Calcolo Scientifico
  • Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei'
  • Australian Research Council
  • Australian Research Data Commons
  • Key Research Program of Frontier Science, Chinese Academy of Sciences
  • CAS Center for Excellence in Particle Physics
  • Fundamental Research Funds for the Central Universities
  • Guangzhou Municipal Science and Technology Project
  • H2020 Marie Skłodowska-Curie Actions
  • European Research Council
  • NextGenerationEU
  • Agence Nationale de la Recherche
  • Région Auvergne-Rhône-Alpes
  • Alexander von Humboldt-Stiftung
  • Generalitat Valenciana
  • Xunta de Galicia
  • Leverhulme Trust
  • Royal Society
  • UK Research and Innovation
  • SER, Switzerland
  • SURF, Netherlands
  • PIC, Spain
  • GridPP, United Kingdom
  • CBPF, Brazil
  • Polish WLCG, Poland
  • CAS PIFI, China
  • Minciencias, Colombia
  • EPLANET, European Union
  • A*MIDEX, France
  • IPhU, France
  • Labex P2IO, France
  • ICSC, Italy
  • GENCAT, Spain
  • Inditex, Spain
  • InTalent and Prog. Atracción Talento, CM, Spain

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