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

Physics

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

578 Scopus citations

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 (US)
Journal	Physical review letters
Volume	87
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.87.091801
State	Published - Aug 14 2001

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.87.091801

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@article{510a96cc0fd74c1381f3edd24d6a5912,

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 Lange, {D. J.} and J. Olsen and P. Elmer",

year = "2001",

month = aug,

day = "14",

doi = "10.1103/PhysRevLett.87.091801",

language = "English (US)",

volume = "87",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

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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 - Lange, D. J.

AU - Olsen, J.

AU - Elmer, P.

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 - http://www.scopus.com/inward/record.url?scp=0035959125&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035959125&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.87.091801

DO - 10.1103/PhysRevLett.87.091801

M3 - Article

C2 - 11531560

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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