First Evidence for Direct CP Violation in Beauty to Charmonium Decays

LHCb Collaboration

doi:10.1103/PhysRevLett.134.101801

First Evidence for Direct CP Violation in Beauty to Charmonium Decays

LHCb Collaboration

National Institute for Subatomic Physics
University of Warwick
University of Zurich
University of Liverpool
Syracuse University
Instituto Galego de Física de Altas Enerxías (IGFAE)
University of Bristol
University of Glasgow
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Université Clermont Auvergne
University of Cincinnati
National Institute for Nuclear Physics
TU Dortmund University
Lamarr Institute for Machine Learning and Artificial Intelligence
CERN
University of Manchester
University of Cambridge
Sorbonne Université
Universidade Federal do Rio de Janeiro
Peking University
University of Milan - Bicocca
University of Chinese Academy of Sciences
University of Rome Tor Vergata
Consejo Nacional de Rectores (CONARE)
CPPM
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
University of Oxford
Université Savoie Mont Blanc
Heidelberg University
Laboratoire Leprince-Ringuet
Pontifícia Universidade Católica do Rio de Janeiro
University of Edinburgh
RWTH Aachen University
AGH University of Krakow
Scuola Normale Superiore di Pisa
CAS - Institute of High Energy Physics
Centro Brasileiro de Pesquisas Físicas
Ramon Llull University
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
Imperial College London
Maastricht University
University of Ferrara
Monash University
University of Padua
Tsinghua University
Wuhan University
University of Barcelona
Facultad de Ciencias Fisicas
University of Bologna
University of Genoa
University of Milan
NASU - Institute of Nuclear Research
University of A Coruna
Horia Hulubei National Institute of Physics and Nuclear Engineering
National Autonomous University of Honduras
Los Alamos National Laboratory
Central China Normal University
Hunan University
University of Cagliari
University of Groningen
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca
University of Bari
Eötvös Loránd University
University College Dublin
South China Normal University
Cracow University of Technology
Rutherford Appleton Laboratory
University of Bonn
University of Perugia
University of Valencia
University of Maryland, College Park
University of Freiburg
National Centre for Nuclear Research
University of Pisa
Universidad Nacional de Colombia
University of Birmingham
NASU - Kharkov Institute of Physics and Technology
Vrije Universiteit Amsterdam
Lanzhou University
Henan University
University of Bergamo
Ruhr University Bochum
University of Siena
University of Basilicata
Max Planck Institute for Nuclear Physics
University of Alcalá
University of Urbino

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.

Original language	English
Article number	101801
Journal	Physical Review Letters
Volume	134
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.134.101801
State	Published - 14 Mar 2025
Externally published	Yes

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10.1103/PhysRevLett.134.101801

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@article{59eda650ba5d4c9abd5f17d95859ed37,

title = "First Evidence for Direct CP Violation in Beauty to Charmonium Decays",

abstract = "The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.",

author = "\{LHCb Collaboration\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Z. Aliouche and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli and M. Argenton and \{Arguedas Cuendis\}, S. and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} 2025 CERN.",

year = "2025",

month = mar,

day = "14",

doi = "10.1103/PhysRevLett.134.101801",

language = "Ingl{\'e}s",

volume = "134",

journal = "Physical Review Letters",

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TY - JOUR

T1 - First Evidence for Direct CP Violation in Beauty to Charmonium Decays

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Aliouche, Z.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreianov, A.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andreou, D.

AU - Anelli, A.

AU - Ao, D.

AU - Archilli, F.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Calderon Ramirez, S.

PY - 2025/3/14

Y1 - 2025/3/14

N2 - The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.

AB - The CP asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay B+→J/ψπ+ are precisely measured relative to the favored decay B+→J/ψK+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fb-1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the CP asymmetry difference and branching fraction ratio are ΔACPACP(B+→J/ψπ+)-ACP(B+→J/ψK+)=(1.29±0.49±0.08)×10-2, Rπ/K[B(B+→J/ψπ+)/B(B+→J/ψK+)]=(3.852±0.022±0.018)×10-2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields ΔACP=(1.42±0.43±0.08)×10-2 and Rπ/K=(3.846±0.018±0.018)×10-2. The combined ΔACP value deviates from zero by 3.2 standard deviations, providing the first evidence for direct CP violation in the amplitudes of beauty decays to charmonium final states.

UR - https://www.scopus.com/pages/publications/105000701638

U2 - 10.1103/PhysRevLett.134.101801

DO - 10.1103/PhysRevLett.134.101801

M3 - Artículo

AN - SCOPUS:105000701638

SN - 0031-9007

VL - 134

JO - Physical Review Letters

JF - Physical Review Letters

IS - 10

M1 - 101801

ER -

First Evidence for Direct CP Violation in Beauty to Charmonium Decays

Abstract

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