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First Measurement of Time-Dependent CP Violation in the Flavor-Changing Neutral-Current Decay B0 → KS0 μ+μ-

  • LHCb Collaboration)

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A flavor-tagged time-dependent analysis of B0→KS0μ+μ- decays is performed across the full dimuon mass range excluding the J/ψ and ψ(2S) 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 CP 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 CP violation in b→sℓ+ℓ- processes.

Original languageEnglish
Article number231904
Pages (from-to)1-14
Number of pages14
JournalPhysical review letters
Volume136
Issue number23
Early online date12 Jun 2026
DOIs
Publication statusPublished - 12 Jun 2026

Bibliographical note

Publisher Copyright:
© 2026 CERN.

Funding

We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: ARC (Australia); CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 and CEA (France); BMFTR, DFG, and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICIU and AEI (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); and DOE NP and NSF (USA). We acknowledge the computing resources that are provided by ARDC (Australia), CBPF (Brazil), CERN, IHEP and LZU (China), IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), Polish WLCG (Poland), IFIN-HH (Romania), PIC (Spain), CSCS (Switzerland), GridPP (United Kingdom), and NSF (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from RTP (Australia), Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP (China); Minciencias (Colombia); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Alexander-von-Humboldt Foundation (Germany); ICSC (Italy); Severo Ochoa and María de Maeztu Units of Excellence, GVA, XuntaGal, GENCAT, InTalent-Inditex and Prog. Atracción Talento CM (Spain); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

Funders
Ministerio de Ciencia, Innovación y Universidades
Agence Nationale de la Recherche
Australian Research Council
National Academy of Sciences of Ukraine
Narodowe Centrum Nauki
GENCAT
Ministerul Cercetării, Inovării şi Digitalizării
Institut national de physique nucléaire et de physique des particules
Science and Technology Facilities Council
H2020 Marie Skłodowska-Curie Actions
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Leverhulme Trust
RTP
Severo Ochoa and María de Maeztu Units of Excellence
IPhU
InTalent-Inditex
Financiadora de Estudos e Projetos
Centre National de la Recherche Scientifique
Max-Planck-Gesellschaft
NSF
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Labex P2IO
Deutsche Forschungsgemeinschaft
A*MIDEX
Région Auvergne-Rhône-Alpes
GVA
International Council of Shopping Centers
Agencia Estatal de Investigación
CAS Center for Excellence in Particle Physics
Institutul de Fizică Atomică
Ministry of Science and Technology of the People's Republic of China
Prog. Atracción Talento CM
Ministerio de Ciencia, Tecnología e Innovación
BMFTR
Chinese Academy of Sciences
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Key Research Program of Frontier Science, Chinese Academy of Sciences
China Earthquake Administration
XuntaGal
NextGenerationEU
Royal Society
Sociedad Española de Reumatología
European Research Council
EPLANET
Ministerstwo Edukacji i Nauki
CERN
Nuclear Physics
Alexander von Humboldt-Stiftung
Istituto Nazionale di Fisica Nucleare
UK Research and Innovation
National Natural Science Foundation of China

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