Observation of large CP violation in the neutral B meson system

Belle Collaboration

doi:10.1103/PhysRevLett.87.091802

Observation of large CP violation in the neutral B meson system

Belle Collaboration

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716 Scopus citations

Abstract

We present a measurement of the standard model CP violation parameter sin2ϕ1 based on a 29.1 fb⁻¹ data sample collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. One neutral B meson is fully reconstructed as a J/ψK_S, ψ(2S)K_S, χ_c1K_S, ηcK_S, J/ψKL, or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2ϕ1=0.99±0.14(stat)±0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

Original language	English (US)
Journal	Physical review letters
Volume	87
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.87.091802
State	Published - Aug 27 2001

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.87.091802

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@article{90a0f9bd6e974095a37cdcbc02461571,

title = "Observation of large CP violation in the neutral B meson system",

abstract = "We present a measurement of the standard model CP violation parameter sin2ϕ1 based on a 29.1 fb−1 data sample collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/ψKS, ψ(2S)KS, χc1KS, ηcKS, J/ψKL, or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2ϕ1=0.99±0.14(stat)±0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.",

author = "\{Belle Collaboration\} and K. Abe and K. Abe and R. Abe and I. Adachi and Ahn, \{Byoung Sup\} and H. Aihara and M. Akatsu and G. Alimonti and K. Asai and M. Asai and Y. Asano and T. Aso and V. Aulchenko and T. Aushev and Bakich, \{A. M.\} and E. Banas and S. Behari and Behera, \{P. K.\} and D. Beiline and A. Bondar and A. Bozek and Browder, \{T. E.\} and Casey, \{B. C.K.\} and P. Chang and Y. Chao and Chen, \{K. F.\} and Cheon, \{B. G.\} and R. Chistov and Choi, \{S. K.\} and Y. Choi and Dong, \{L. Y.\} and J. Dragic and A. Drutskoy and S. Eidelman and V. Eiges and Y. Enari and R. Enomoto and Everton, \{C. W.\} and F. Fang and H. Fujii and C. Fukunaga and M. Fukushima and N. Gabyshev and A. Garmash and Gershon, \{T. J.\} and A. Gordon and K. Gotow and H. Guler and R. Guo and D. Marlow",

year = "2001",

month = aug,

day = "27",

doi = "10.1103/PhysRevLett.87.091802",

language = "English (US)",

volume = "87",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "9",

}

TY - JOUR

T1 - Observation of large CP violation in the neutral B meson system

AU - Belle Collaboration

AU - Abe, K.

AU - Abe, R.

AU - Adachi, I.

AU - Ahn, Byoung Sup

AU - Aihara, H.

AU - Akatsu, M.

AU - Alimonti, G.

AU - Asai, K.

AU - Asai, M.

AU - Asano, Y.

AU - Aso, T.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Banas, E.

AU - Behari, S.

AU - Behera, P. K.

AU - Beiline, D.

AU - Bondar, A.

AU - Bozek, A.

AU - Browder, T. E.

AU - Casey, B. C.K.

AU - Chang, P.

AU - Chao, Y.

AU - Chen, K. F.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Choi, S. K.

AU - Choi, Y.

AU - Dong, L. Y.

AU - Dragic, J.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Eiges, V.

AU - Enari, Y.

AU - Enomoto, R.

AU - Everton, C. W.

AU - Fang, F.

AU - Fujii, H.

AU - Fukunaga, C.

AU - Fukushima, M.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gershon, T. J.

AU - Gordon, A.

AU - Gotow, K.

AU - Guler, H.

AU - Guo, R.

AU - Marlow, D.

PY - 2001/8/27

Y1 - 2001/8/27

N2 - We present a measurement of the standard model CP violation parameter sin2ϕ1 based on a 29.1 fb−1 data sample collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/ψKS, ψ(2S)KS, χc1KS, ηcKS, J/ψKL, or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2ϕ1=0.99±0.14(stat)±0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

AB - We present a measurement of the standard model CP violation parameter sin2ϕ1 based on a 29.1 fb−1 data sample collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/ψKS, ψ(2S)KS, χc1KS, ηcKS, J/ψKL, or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2ϕ1=0.99±0.14(stat)±0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

UR - https://www.scopus.com/pages/publications/0035959151

UR - https://www.scopus.com/pages/publications/0035959151#tab=citedBy

U2 - 10.1103/PhysRevLett.87.091802

DO - 10.1103/PhysRevLett.87.091802

M3 - Article

C2 - 11531561

AN - SCOPUS:0035959151

SN - 0031-9007

VL - 87

JO - Physical review letters

JF - Physical review letters

IS - 9

ER -

Observation of large CP violation in the neutral B meson system

Abstract

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