Measurement of the Time-Integrated 𝐢⁒𝑃 Asymmetry in 𝐷0β†’πΎβˆ’β’πΎ+ Decays

LHCb Collaboration

Research output: Contribution to Journal β€Ί Article β€Ί Academic β€Ί peer-review

Abstract

The time-integrated 𝐢⁒𝑃 asymmetry in the Cabibbo-suppressed decay 𝐷0β†’πΎβˆ’β’πΎ+ is measured using proton-proton collision data, corresponding to an integrated luminosity of 5.7  fbβˆ’1 collected at a center-of-mass energy of 13Β TeV with the LHCb detector. The 𝐷0 mesons are required to originate from promptly produced 𝐷*+→𝐷0β’πœ‹+ decays, and the charge of the companion pion is used to determine the flavor of the charm meson at production. The time-integrated 𝐢⁒𝑃 asymmetry is measured to be π’œπΆβ’π‘ƒβ‘(πΎβˆ’β’πΎ+)=[6.8Β±5.4Β±1.6]Γ—10βˆ’4 where the first uncertainty is statistical and the second systematic. The direct 𝐢⁒𝑃 asymmetries in 𝐷0β†’πΎβˆ’β’πΎ+ and 𝐷0β†’πœ‹βˆ’β’πœ‹+ decays, π‘Žπ‘‘πΎβˆ’β’πΎ+ and π‘Žπ‘‘πœ‹βˆ’β’πœ‹+, are derived by combining π’œπΆβ’π‘ƒβ‘(πΎβˆ’β’πΎ+) with the time-integrated 𝐢⁒𝑃 asymmetry difference, Δ⁒𝐴𝐢⁒𝑃=π’œπΆβ’π‘ƒβ‘(πΎβˆ’β’πΎ+)βˆ’π’œπΆβ’π‘ƒβ‘(πœ‹βˆ’β’πœ‹+), and other inputs, giving π‘Žπ‘‘πΎβˆ’β’πΎ+=(7.7Β±5.7)Γ—10βˆ’4,π‘Žπ‘‘πœ‹βˆ’β’πœ‹+=(23.2Β±6.1)Γ—10βˆ’4,with a correlation coefficient corresponding to 𝜌 =0.88. The compatibility of these results with 𝐢⁒𝑃 symmetry is 1.4 and 3.8 standard deviations for 𝐷0β†’πΎβˆ’β’πΎ+ and 𝐷0 β†’πœ‹βˆ’β’πœ‹+ decays, respectively. This is the first evidence for direct 𝐢⁒𝑃 violation in a specific 𝐷0 decay.
Original languageEnglish
Article number091802
Pages (from-to)1-13
Number of pages13
JournalPhysical review letters
Volume131
Issue number9
Early online date29 Aug 2023
DOIs
Publication statusPublished - 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 SkΕ‚odowska-Curie Actions, and ERC (European Union); A*MIDEX, ANR, IPhU and Labex P2IO, and RΓ©gion Auvergne-RhΓ΄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 and Prog. AtracciΓ³n Talento, CM (Spain); SRC (Sweden); the Leverhulme Trust, the Royal Society, and UKRI (United Kingdom).

FundersFunder number
Agence Nationale de la Recherche
Australian Research Data Commons
National Academy of Sciences of Ukraine
Narodowe Centrum Nauki
National Science Foundation
Institut national de physique nuclΓ©aire et de physique des particules
H2020 Marie SkΕ‚odowska-Curie Actions
Automotive Research Center
FundaΓ§Γ£o Carlos Chagas Filho de Amparo Γ  Pesquisa do Estado do Rio de Janeiro
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Ministerio de Ciencia e InnovaciΓ³n
Instituto Nazionale di Fisica Nucleare
Financiadora de Estudos e Projetos
Centre National de la Recherche Scientifique
Bundesministerium fΓΌr Bildung und Forschung
Conselho Nacional de Desenvolvimento CientΓ­fico e TecnolΓ³gico
CoordenaΓ§Γ£o de AperfeiΓ§oamento de Pessoal de NΓ­vel Superior
Deutsche Forschungsgemeinschaft
RΓ©gion Auvergne-RhΓ΄ne-Alpes
Ministry of Science and Technology of the People's Republic of China
CAS CCEPP
Chinese Academy of Sciences
Schweizerischer Nationalfonds zur FΓΆrderung der Wissenschaftlichen Forschung
Key Research Program of Frontier Sciences of CAS
Sociedad EspaΓ±ola de ReumatologΓ­a
European Research Council
EPLANET
Ministerstwo Edukacji i Nauki
CERN
Nuclear Physics
Fundamental Research Funds for the Central Universities
Alexander von Humboldt-Stiftung
National Natural Science Foundation of China
Science and Technology Facilities CouncilST/X006018/1

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