Measurement of CP Violation in B0→ψ(→ℓ+)K0S(→π+π) Decays

LHCb Collaboration

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Abstract

A measurement of time-dependent CP violation in the decays of B0 and B̅0 mesons to the final states J/ψ(→μ+μ)K0S, ψ(2S)(→μ+μ)K0S and J/ψ(→e+e)K0S with K0S→π+π is presented. The data correspond to an integrated luminosity of 6  fb−1 collected at a center-of-mass energy of √s = 13  TeV with the LHCb detector. The CP-violation parameters are measured to be SψK0S=0.717±0.013(stat)±0.008(syst) and CψK0S=0.008±0.012(stat)±0.003(syst). This measurement of SψK0S represents the most precise single measurement of the CKM angle β to date and is more precise than the current world average. In addition, measurements of the CP-violation parameters of the individual channels are reported and a combination with the LHCb Run 1 measurements is performed.
Original languageEnglish
Article number021801
Number of pages12
JournalPhysical Review Letters
Volume132
Issue number2
Early online date8 Jan 2024
DOIs
Publication statusPublished - 12 Jan 2024

Bibliographical note

Acknowledgments:
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: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MCID/IFA (Romania); MICINN (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), Polish WLCG (Poland) and NERSC (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 ARC and ARDC (Australia); Minciencias (Colombia); AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, CAS CCEPP, Fundamental Research Funds for the Central Universities, and Sci. & Tech. Program of Guangzhou (China); GVA, XuntaGal, GENCAT, Inditex, InTalent and Prog. Atracción Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).

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