Measurement of the Time-Integrated CP Asymmetry in D^{0}→K^{-}K^{+} Decays

LHCb Collaboration

doi:10.1103/PhysRevLett.131.091802

Measurement of the Time-Integrated CP Asymmetry in D^{0}→K^{-}K^{+} Decays

LHCb Collaboration

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

The time-integrated CP asymmetry in the Cabibbo-suppressed decay D^{0}→K^{-}K^{+} is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D^{0} mesons are required to originate from promptly produced D^{*+}→D^{0}π^{+} decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be A_{CP}(K^{-}K^{+})=[6.8±5.4±1.6]×10^{-4} where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, a_{K^{-}K^{+}}^{d} and a_{π^{-}π^{+}}^{d}, are derived by combining A_{CP}(K^{-}K^{+}) with the time-integrated CP asymmetry difference, ΔA_{CP}=A_{CP}(K^{-}K^{+})-A_{CP}(π^{-}π^{+}), and other inputs, giving a_{K^{-}K^{+}}^{d}=(7.7±5.7)×10^{-4},a_{π^{-}π^{+}}^{d}=(23.2±6.1)×10^{-4},with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, respectively. This is the first evidence for direct CP violation in a specific D^{0} decay.

Original language	English
Article number	091802
Pages (from-to)	1-13
Number of pages	13
Journal	Physical review letters
Volume	131
Issue number	9
Early online date	29 Aug 2023
DOIs	https://doi.org/10.1103/PhysRevLett.131.091802
Publication status	Published - 1 Sept 2023

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: 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); MEN/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, and ERC (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 and Prog. Atracción Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society, and UKRI (United Kingdom).

Funders	Funder number
CAS CCEPP
EPLANET
Key Research Program of Frontier Sciences of CAS
National Science Foundation
Alexander von Humboldt-Stiftung
Nuclear Physics
Automotive Research Center
H2020 Marie Skłodowska-Curie Actions
CERN
Science and Technology Facilities Council
European Research Council
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
National Natural Science Foundation of China
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Ministry of Science and Technology of the People's Republic of China
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Edukacji i Nauki
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
National Academy of Sciences of Ukraine
Centre National de la Recherche Scientifique
Financiadora de Estudos e Projetos
Ministerio de Ciencia e Innovación
Région Auvergne-Rhône-Alpes
Fundamental Research Funds for the Central Universities
Institut national de physique nucléaire et de physique des particules
Sociedad Española de Reumatología
Australian Research Data Commons

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@article{c27f280421294f059a57627833ce0906,

title = "Measurement of the Time-Integrated CP Asymmetry in D^{0}→K^{-}K^{+} Decays",

abstract = "The time-integrated CP asymmetry in the Cabibbo-suppressed decay D^{0}→K^{-}K^{+} is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D^{0} mesons are required to originate from promptly produced D^{*+}→D^{0}π^{+} decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be A_{CP}(K^{-}K^{+})=[6.8±5.4±1.6]×10^{-4} where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, a_{K^{-}K^{+}}^{d} and a_{π^{-}π^{+}}^{d}, are derived by combining A_{CP}(K^{-}K^{+}) with the time-integrated CP asymmetry difference, ΔA_{CP}=A_{CP}(K^{-}K^{+})-A_{CP}(π^{-}π^{+}), and other inputs, giving a_{K^{-}K^{+}}^{d}=(7.7±5.7)×10^{-4},a_{π^{-}π^{+}}^{d}=(23.2±6.1)×10^{-4},with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, respectively. This is the first evidence for direct CP violation in a specific D^{0} decay.",

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Ukleja and Unverzagt, {D. J.} and A. Usachov and A. Ustyuzhanin and U. Uwer and A. Vagner and V. Vagnoni and A. Valassi and G. Valenti and {Valls Canudas}, N. and {van Beuzekom}, M. and {Van Dijk}, M. and {Van Hecke}, H. and {van Herwijnen}, E. and {Van Hulse}, {C. B.} and {van Veghel}, M. and {Vazquez Gomez}, R. and {Vazquez Regueiro}, P. and {V{\'a}zquez Sierra}, C. and S. Vecchi and Velthuis, {J. J.} and M. Veltri and A. Venkateswaran and M. Veronesi and M. Vesterinen and D. Vieira and {Vieites Diaz}, M. and X. Vilasis-Cardona and {Vilella Figueras}, E. and A. Villa and P. Vincent and Volle, {F. C.} and {Vom Bruch}, D. and A. Vorobyev and V. Vorobyev and N. Voropaev and K. Vos and C. Vrahas and R. Waldi and J. Walsh and G. Wan and C. Wang and J. Wang and J. Wang and J. Wang and J. Wang and M. Wang and R. Wang and X. Wang and Y. Wang and Z. Wang and Z. Wang and Z. Wang and Ward, {J. A.} and Watson, {N. K.} and D. Websdale and Y. Wei and C. Weisser and Westhenry, {B. D.C.} and White, {D. J.} and M. Whitehead and Wiederhold, {A. R.} and D. Wiedner and G. Wilkinson and Wilkinson, {M. K.} and I. Williams and M. Williams and Williams, {M. R.J.} and R. Williams and Wilson, {F. F.} and W. Wislicki and M. Witek and L. Witola and Wong, {C. P.} and G. Wormser and Wotton, {S. A.} and H. Wu and K. Wyllie and Z. Xiang and D. Xiao and Y. Xie and A. Xu and J. Xu and L. Xu and M. Xu and Q. Xu and Z. Xu and Z. Xu and D. Yang and S. Yang and X. Yang and Y. Yang and Z. Yang and Z. Yang and Yeomans, {L. E.} and V. Yeroshenko and H. Yeung and H. Yin and J. Yu and X. Yuan and E. Zaffaroni and M. Zavertyaev and M. Zdybal and O. Zenaiev and M. Zeng and C. Zhang and D. Zhang and L. Zhang and S. Zhang and S. Zhang and Y. Zhang and Y. Zhang and A. Zharkova and A. Zhelezov and Y. Zheng and T. Zhou and X. Zhou and Y. Zhou and V. Zhovkovska and X. Zhu and X. Zhu and Z. Zhu and V. Zhukov and Q. Zou and S. Zucchelli and D. Zuliani and G. Zunica and {LHCb Collaboration}",

year = "2023",

month = sep,

day = "1",

doi = "10.1103/PhysRevLett.131.091802",

language = "English",

volume = "131",

pages = "1--13",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

}

TY - JOUR

T1 - Measurement of the Time-Integrated CP Asymmetry in D^{0}→K^{-}K^{+} Decays

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AU - LHCb Collaboration

PY - 2023/9/1

Y1 - 2023/9/1

N2 - The time-integrated CP asymmetry in the Cabibbo-suppressed decay D^{0}→K^{-}K^{+} is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D^{0} mesons are required to originate from promptly produced D^{*+}→D^{0}π^{+} decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be A_{CP}(K^{-}K^{+})=[6.8±5.4±1.6]×10^{-4} where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, a_{K^{-}K^{+}}^{d} and a_{π^{-}π^{+}}^{d}, are derived by combining A_{CP}(K^{-}K^{+}) with the time-integrated CP asymmetry difference, ΔA_{CP}=A_{CP}(K^{-}K^{+})-A_{CP}(π^{-}π^{+}), and other inputs, giving a_{K^{-}K^{+}}^{d}=(7.7±5.7)×10^{-4},a_{π^{-}π^{+}}^{d}=(23.2±6.1)×10^{-4},with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, respectively. This is the first evidence for direct CP violation in a specific D^{0} decay.

AB - The time-integrated CP asymmetry in the Cabibbo-suppressed decay D^{0}→K^{-}K^{+} is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7 fb^{-1} collected at a center-of-mass energy of 13 TeV with the LHCb detector. The D^{0} mesons are required to originate from promptly produced D^{*+}→D^{0}π^{+} decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated CP asymmetry is measured to be A_{CP}(K^{-}K^{+})=[6.8±5.4±1.6]×10^{-4} where the first uncertainty is statistical and the second systematic. The direct CP asymmetries in D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, a_{K^{-}K^{+}}^{d} and a_{π^{-}π^{+}}^{d}, are derived by combining A_{CP}(K^{-}K^{+}) with the time-integrated CP asymmetry difference, ΔA_{CP}=A_{CP}(K^{-}K^{+})-A_{CP}(π^{-}π^{+}), and other inputs, giving a_{K^{-}K^{+}}^{d}=(7.7±5.7)×10^{-4},a_{π^{-}π^{+}}^{d}=(23.2±6.1)×10^{-4},with a correlation coefficient corresponding to ρ=0.88. The compatibility of these results with CP symmetry is 1.4 and 3.8 standard deviations for D^{0}→K^{-}K^{+} and D^{0}→π^{-}π^{+} decays, respectively. This is the first evidence for direct CP violation in a specific D^{0} decay.

UR - http://www.scopus.com/inward/record.url?scp=85171696786&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85171696786&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.131.091802

DO - 10.1103/PhysRevLett.131.091802

M3 - Article

C2 - 37721849

AN - SCOPUS:85171696786

SN - 0031-9007

VL - 131

SP - 1

EP - 13

JO - Physical review letters

JF - Physical review letters

IS - 9

M1 - 091802

ER -

Measurement of the Time-Integrated CP Asymmetry in D^{0}→K^{-}K^{+} Decays

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