Observation of CP Violation in B0 →j/ψρ (770)0 Decays

(LHCb Collaboration)

doi:10.1103/6f6r-51br

Observation of CP Violation in B0 →j/ψρ (770)0 Decays

(LHCb Collaboration)

Science Park 105
University of Warwick
Physik-Institut der Universität Zürich
University of Edinburgh
University of Liverpool
Syracuse University
Universidade de Santiago de Compostela
University of Bristol
SUPA
University of Glasgow
Department of Physics and Astronomy
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Clermont-Auvergne University
Faculty of Physics and Applied Computer Science
Agh University of Science and Technology Faculty of Computer Science
LNF-INFN
Fakultät Physik
University of Dortmund
Lamarr Institute for Machine Learning and Artificial Intelligence
Physikalisches Institut
University of Freiburg
Vilnius University
European Organization for Nuclear Research
University of Cambridge
Sorbonne Université
Instituto de Biofisica da UFRJ
State Key Laboratory of Nuclear Physics and Technology
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
Sezione INFN di Ferrara
Universidade da Coruña
INFN Sezione di Milano-Bicocca
University of Milano-Bicocca
University of Chinese Academy of Sciences
INFN Roma Tor Vergata
Consejo Nacional de Rectores (CONARE)
Aix-Marseille Université
Institute of Physics
ENAC-IIC-GEL
Massachusetts Institute of Technology
Ip Paris
University of Oxford

Résultats de recherche: Contribution à un journal › Article › Revue par des pairs

Résumé

The time-dependent CP asymmetry in B0→J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2βcc¯deff=0.710±0.084±0.051 rad and |λ|=1.019±0.034±0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0→J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δφs, to the CP-violating phase φs in Bs0→J/ψφ(1020) decays, yielding Δφs=5.0±4.6 mrad.

langue originale	Anglais
Numéro d'article	031803
journal	Physical Review Letters
Volume	137
Numéro de publication	3
Les DOIs	https://doi.org/10.1103/6f6r-51br
état	Publié - 17 juil. 2026

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10.1103/6f6r-51br

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@article{82abce9fe63541349f48c3bbf6de45c1,

title = "Observation of CP Violation in B0 →j/ψρ (770)0 Decays",

abstract = "The time-dependent CP asymmetry in B0→J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2βcc¯deff=0.710±0.084±0.051 rad and |λ|=1.019±0.034±0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0→J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δφs, to the CP-violating phase φs in Bs0→J/ψφ(1020) decays, yielding Δφs=5.0±4.6 mrad.",

author = "\{(LHCb Collaboration)\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and Beteta, \{C. Abellan\} 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 M. Akthar and P. Albicocco and J. Albrecht and R. Aleksiejunas and F. Alessio and Cartelle, \{P. Alvarez\} and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and P. Andreola and M. Andreotti and Estrada, \{S. Andres\} and A. Anelli and D. Ao and C. Arata and F. Archilli and Z. Areg and M. Argenton and Cuendis, \{S. Arguedas\} and L. Arnone and A. Artamonov and M. Artuso and E. Aslanides and \{Da Silva\}, \{R. Ata{\'i}de\} and M. Atzeni and B. Audurier and Authier, \{J. A.\} and D. Bacher and V. Balagura and F. Fleuret and E. Maurice and Niel, \{E. M.\}",

note = "Publisher Copyright: {\textcopyright} 2026 CERN. ",

year = "2026",

month = jul,

day = "17",

doi = "10.1103/6f6r-51br",

language = "English",

volume = "137",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "3",

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TY - JOUR

T1 - Observation of CP Violation in B0 →j/ψρ (770)0 Decays

AU - (LHCb Collaboration)

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Beteta, C. Abellan

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 - Akthar, M.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Aleksiejunas, R.

AU - Alessio, F.

AU - Cartelle, P. Alvarez

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreola, P.

AU - Andreotti, M.

AU - Estrada, S. Andres

AU - Anelli, A.

AU - Ao, D.

AU - Arata, C.

AU - Archilli, F.

AU - Areg, Z.

AU - Argenton, M.

AU - Cuendis, S. Arguedas

AU - Arnone, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Da Silva, R. Ataíde

AU - Atzeni, M.

AU - Audurier, B.

AU - Authier, J. A.

AU - Bacher, D.

AU - Balagura, V.

AU - Fleuret, F.

AU - Maurice, E.

AU - Niel, E. M.

PY - 2026/7/17

Y1 - 2026/7/17

N2 - The time-dependent CP asymmetry in B0→J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2βcc¯deff=0.710±0.084±0.051 rad and |λ|=1.019±0.034±0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0→J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δφs, to the CP-violating phase φs in Bs0→J/ψφ(1020) decays, yielding Δφs=5.0±4.6 mrad.

AB - The time-dependent CP asymmetry in B0→J/ψρ(770)0 decays is measured using proton-proton collision data corresponding to an integrated luminosity of 6 fb-1, collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015-2018. The CP-violation parameters for this process are determined to be 2βcc¯deff=0.710±0.084±0.051 rad and |λ|=1.019±0.034±0.024, where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent CP violation in B0→J/ψρ(770)0 decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, Δφs, to the CP-violating phase φs in Bs0→J/ψφ(1020) decays, yielding Δφs=5.0±4.6 mrad.

UR - https://www.scopus.com/pages/publications/105046522657

U2 - 10.1103/6f6r-51br

DO - 10.1103/6f6r-51br

M3 - Article

C2 - 42537061

AN - SCOPUS:105046522657

SN - 0031-9007

VL - 137

JO - Physical Review Letters

JF - Physical Review Letters

IS - 3

M1 - 031803

ER -

Observation of CP Violation in B0 →j/ψρ (770)0 Decays

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