Observation of CP violation in the B0 meson system

BABAR Collaboration

doi:10.1103/PhysRevLett.87.091801

Observation of CP violation in the B⁰ meson system

BABAR Collaboration

Laboratoire de Physique des Particules
Università degli studi di Bari Aldo Moro
Institute of High Energy Physics, Chinese Academy of Sciences
University of Bergen
University of California, Berkeley
University of Birmingham
Ruhr-University Bochum
University of Bristol
University of British Columbia
Brunel University London
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Long Beach VA and University of California
University of California, Los Angeles
University of California, San Diego
University of California, Santa Barbara
University of California at Santa Cruz
California Institute of Technology
University of Cincinnati
University of Colorado Boulder
Cooperative Institute for Research in the Atmosphere
Technical University Dresden
University of Edinburgh
Elon University
University of Ferrara
Florida A and M University
LNF-INFN
University of Perugia
University of Genoa
Harvard University
University of Iowa
Iowa State University
Laboratoire de l'Accélérateur Linéaire
Lawrence Livermore National Laboratory
University of Liverpool
Imperial College London
Queen Mary University of London
Royal Holloway University of London
University of Louisville
University of Manchester
University of Maryland, College Park
UMass Amherst
Massachusetts Institute of Technology
McGill University
University of Milano
University of Mississippi
Universite de Montreal
Mount Holyoke College
University of Naples Federico II
Università degli Studi della Basilicata
University of Notre Dame
Oak Ridge National Laboratory
University of Oregon
University of Padova
Sorbonne Université
University of Pavia
University of Pennsylvania
University of Pisa
Prairie View A and M University
Princeton University
Dipartimento di Fisica
Universität Rostock
CCLRC Rutherford Appleton Laboratory
Institut Pierre Simon Laplace, CNRS and CEA
University of South Carolina
Stanford Linear Accelerator Center
Stanford University
TRIUMF
University of Tennessee
University of Texas
University of Turin
University of Trieste
Vanderbilt University
University of Victoria
University of Wisconsin-Madison
Yale University

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

Abstract

We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of γ(4S)decays collected in 2001, bringing the data available to 32 ×10⁶ BB^¯ We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2β, is derived from the decay time distributions in such events. The result sin2β=0.59 ± 0.14(stat)±0.05(syst) establishes CP violation in the B⁰ meson system. We also determine |λ|= 0.93±0.09(stat)±0.03(syst), consistent with no direct CP violation.

Original language	English
Journal	Physical Review Letters
Volume	87
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.87.091801
Publication status	Published - 14 Aug 2001

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10.1103/PhysRevLett.87.091801

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@article{75c8bd82454e47ff88253a11832da578,

title = "Observation of CP violation in the B0 meson system",

abstract = "We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of γ(4S)decays collected in 2001, bringing the data available to 32 ×106 BB¯ We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2β, is derived from the decay time distributions in such events. The result sin2β=0.59 ± 0.14(stat)±0.05(syst) establishes CP violation in the B0 meson system. We also determine |λ|= 0.93±0.09(stat)±0.03(syst), consistent with no direct CP violation.",

author = "\{BABAR Collaboration\} and B. Aubert and D. Boutigny and Gaillard, \{J. M.\} and A. Hicheur and Y. Karyotakis and Lees, \{J. P.\} and P. Robbe and V. Tisserand and A. Palano and Chen, \{G. P.\} and Chen, \{J. C.\} and Qi, \{N. D.\} and G. Rong and P. Wang and Zhu, \{Y. S.\} and G. Eigen and Reinertsen, \{P. L.\} and B. Stugu and B. Abbott and Abrams, \{G. S.\} and Borgland, \{A. W.\} and Breon, \{A. B.\} and Brown, \{D. N.\} and J. Button-Shafer and Cahn, \{R. N.\} and Clark, \{A. R.\} and Gill, \{M. S.\} and Gritsan, \{A. V.\} and Y. Groysman and Jacobsen, \{R. G.\} and Kadel, \{R. W.\} and J. Kadyk and Kerth, \{L. T.\} and S. Kluth and Kolomensky, \{Yu G.\} and Kral, \{J. F.\} and C. LeClerc and Levi, \{M. E.\} and T. Liu and G. Lynch and Meyer, \{A. B.\} and M. Momayezi and Oddone, \{P. J.\} and A. Perazzo and M. Pripstein and Roe, \{N. A.\} and A. Romosan and D. Bernard and Ch Thiebaux and M. Verderi",

year = "2001",

month = aug,

day = "14",

doi = "10.1103/PhysRevLett.87.091801",

language = "English",

volume = "87",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "9",

}

TY - JOUR

T1 - Observation of CP violation in the B0 meson system

AU - BABAR Collaboration

AU - Aubert, B.

AU - Boutigny, D.

AU - Gaillard, J. M.

AU - Hicheur, A.

AU - Karyotakis, Y.

AU - Lees, J. P.

AU - Robbe, P.

AU - Tisserand, V.

AU - Palano, A.

AU - Chen, G. P.

AU - Chen, J. C.

AU - Qi, N. D.

AU - Rong, G.

AU - Wang, P.

AU - Zhu, Y. S.

AU - Eigen, G.

AU - Reinertsen, P. L.

AU - Stugu, B.

AU - Abbott, B.

AU - Abrams, G. S.

AU - Borgland, A. W.

AU - Breon, A. B.

AU - Brown, D. N.

AU - Button-Shafer, J.

AU - Cahn, R. N.

AU - Clark, A. R.

AU - Gill, M. S.

AU - Gritsan, A. V.

AU - Groysman, Y.

AU - Jacobsen, R. G.

AU - Kadel, R. W.

AU - Kadyk, J.

AU - Kerth, L. T.

AU - Kluth, S.

AU - Kolomensky, Yu G.

AU - Kral, J. F.

AU - LeClerc, C.

AU - Levi, M. E.

AU - Liu, T.

AU - Lynch, G.

AU - Meyer, A. B.

AU - Momayezi, M.

AU - Oddone, P. J.

AU - Perazzo, A.

AU - Pripstein, M.

AU - Roe, N. A.

AU - Romosan, A.

AU - Bernard, D.

AU - Thiebaux, Ch

AU - Verderi, M.

PY - 2001/8/14

Y1 - 2001/8/14

N2 - We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of γ(4S)decays collected in 2001, bringing the data available to 32 ×106 BB¯ We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2β, is derived from the decay time distributions in such events. The result sin2β=0.59 ± 0.14(stat)±0.05(syst) establishes CP violation in the B0 meson system. We also determine |λ|= 0.93±0.09(stat)±0.03(syst), consistent with no direct CP violation.

AB - We present an updated measurement of time-dependent CP-violating asymmetries in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. This result uses an additional sample of γ(4S)decays collected in 2001, bringing the data available to 32 ×106 BB¯ We select events in which one neutral B meson is fully reconstructed in a final state containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2β, is derived from the decay time distributions in such events. The result sin2β=0.59 ± 0.14(stat)±0.05(syst) establishes CP violation in the B0 meson system. We also determine |λ|= 0.93±0.09(stat)±0.03(syst), consistent with no direct CP violation.

UR - https://www.scopus.com/pages/publications/0035959125

U2 - 10.1103/PhysRevLett.87.091801

DO - 10.1103/PhysRevLett.87.091801

M3 - Article

AN - SCOPUS:0035959125

SN - 0031-9007

VL - 87

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

ER -

Observation of CP violation in the B⁰ meson system

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