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

LHCb Collaboration

doi:10.1103/PhysRevLett.132.021801

Measurement of CP Violation in B⁰→ψ(→ℓ⁺ℓ⁻)K⁰_S(→π⁺π⁻) Decays

LHCb Collaboration

Physics and Astronomy

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Abstract

A measurement of time-dependent CP violation in the decays of B⁰ and B̅⁰mesons to the final states J/ψ(→μ⁺μ⁻)K⁰_S, ψ(2S)(→μ⁺μ⁻)K⁰_S and J/ψ(→e⁺e⁻)K⁰_S with K⁰_S→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 S_ψK0S=0.717±0.013(stat)±0.008(syst) and C_ψK0S=0.008±0.012(stat)±0.003(syst). This measurement of S_ψK0S 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 language	English
Article number	021801
Number of pages	12
Journal	Physical Review Letters
Volume	132
Issue number	2
Early online date	8 Jan 2024
DOIs	https://doi.org/10.1103/PhysRevLett.132.021801
Publication status	Published - 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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Cite this

@article{cfc7026317cc49f5a59d04ab53480824,

title = "Measurement of CP Violation in B0→ψ(→ℓ+ℓ−)K0S(→π+π−) Decays",

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.",

author = "{LHCb Collaboration} and Nigel Watson and Niladribihari Sahoo and Simone Bifani and Daniel Thompson and Naomi Cooke and Jonathan Plews and Paul Swallow and Mark Slater",

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 Sk{\l}odowska-Curie Actions, ERC and NextGenerationEU (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and R{\'e}gion Auvergne-Rh{\^o}ne-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. Atracci{\'o}n Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society and UKRI (United Kingdom).",

year = "2024",

month = jan,

day = "12",

doi = "10.1103/PhysRevLett.132.021801",

language = "English",

volume = "132",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

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T1 - Measurement of CP Violation in B0→ψ(→ℓ+ℓ−)K0S(→π+π−) Decays

AU - LHCb Collaboration

AU - Watson, Nigel

AU - Sahoo, Niladribihari

AU - Bifani, Simone

AU - Thompson, Daniel

AU - Cooke, Naomi

AU - Plews, Jonathan

AU - Swallow, Paul

AU - Slater, Mark

N1 - 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).

PY - 2024/1/12

Y1 - 2024/1/12

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.132.021801

DO - 10.1103/PhysRevLett.132.021801

M3 - Article

SN - 0031-9007

VL - 132

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

M1 - 021801

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