Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

B. Aubert; L.L. Zhang; S. Chen; W. Wang; J.M. Anderson; X.H. Li; M.A. Baak; G. Raven; H. Snoek; P. David; H. Schroder; H. Liu; N. van Bakel; A. Wagner; Z. Yu

doi:10.1103/PhysRevLett.99.021603

Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

B. Aubert, L.L. Zhang, S. Chen, W. Wang, J.M. Anderson, X.H. Li, M.A. Baak, G. Raven, H. Snoek, P. David, H. Schroder, H. Liu, N. van Bakel, A. Wagner, Z. Yu

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Abstract

We report observations of CP violation in the decays B0→K+π- and B0→π+π- in a sample of 383×106 Υ(4S)→BB̄ events. We find 4372±82 B0→K+π- decays and measure the direct CP-violating charge asymmetry AKπ=-0.107±0.018(stat)-0.004+0.007(syst) , which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139±49 B0→π+π- decays and measure the CP-violating asymmetries Sππ=-0.60±0.11(stat)±0.03(syst) and Cππ=-0. 21±0.09(stat)±0.02(syst). CP conservation in B0→π+π- (Sππ=Cππ=0) is excluded at a confidence level 1-C.L.=8×10-8, corresponding to 5.4 standard deviations. © 2007 The American Physical Society.

Original language	English
Journal	Physical Review Letters
Volume	99
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.99.021603
Publication status	Published - 2007

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Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

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@article{193fbcf2851041cabb2ddfd1e39071fe,

title = "Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)",

abstract = "We report observations of CP violation in the decays B0→K+π- and B0→π+π- in a sample of 383×106 Υ(4S)→B{\=B} events. We find 4372±82 B0→K+π- decays and measure the direct CP-violating charge asymmetry AKπ=-0.107±0.018(stat)-0.004+0.007(syst) , which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139±49 B0→π+π- decays and measure the CP-violating asymmetries Sππ=-0.60±0.11(stat)±0.03(syst) and Cππ=-0. 21±0.09(stat)±0.02(syst). CP conservation in B0→π+π- (Sππ=Cππ=0) is excluded at a confidence level 1-C.L.=8×10-8, corresponding to 5.4 standard deviations. {\textcopyright} 2007 The American Physical Society.",

author = "B. Aubert and L.L. Zhang and S. Chen and W. Wang and J.M. Anderson and X.H. Li and M.A. Baak and G. Raven and H. Snoek and P. David and H. Schroder and H. Liu and {van Bakel}, N. and A. Wagner and Z. Yu",

note = "Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)",

year = "2007",

doi = "10.1103/PhysRevLett.99.021603",

language = "English",

volume = "99",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "2",

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TY - JOUR

T1 - Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

AU - Aubert, B.

AU - Zhang, L.L.

AU - Chen, S.

AU - Wang, W.

AU - Anderson, J.M.

AU - Li, X.H.

AU - Baak, M.A.

AU - Raven, G.

AU - Snoek, H.

AU - David, P.

AU - Schroder, H.

AU - Liu, H.

AU - van Bakel, N.

AU - Wagner, A.

AU - Yu, Z.

N1 - Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

PY - 2007

Y1 - 2007

N2 - We report observations of CP violation in the decays B0→K+π- and B0→π+π- in a sample of 383×106 Υ(4S)→BB̄ events. We find 4372±82 B0→K+π- decays and measure the direct CP-violating charge asymmetry AKπ=-0.107±0.018(stat)-0.004+0.007(syst) , which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139±49 B0→π+π- decays and measure the CP-violating asymmetries Sππ=-0.60±0.11(stat)±0.03(syst) and Cππ=-0. 21±0.09(stat)±0.02(syst). CP conservation in B0→π+π- (Sππ=Cππ=0) is excluded at a confidence level 1-C.L.=8×10-8, corresponding to 5.4 standard deviations. © 2007 The American Physical Society.

AB - We report observations of CP violation in the decays B0→K+π- and B0→π+π- in a sample of 383×106 Υ(4S)→BB̄ events. We find 4372±82 B0→K+π- decays and measure the direct CP-violating charge asymmetry AKπ=-0.107±0.018(stat)-0.004+0.007(syst) , which excludes the CP-conserving hypothesis with a significance of 5.5 standard deviations. In the same sample, we find 1139±49 B0→π+π- decays and measure the CP-violating asymmetries Sππ=-0.60±0.11(stat)±0.03(syst) and Cππ=-0. 21±0.09(stat)±0.02(syst). CP conservation in B0→π+π- (Sππ=Cππ=0) is excluded at a confidence level 1-C.L.=8×10-8, corresponding to 5.4 standard deviations. © 2007 The American Physical Society.

U2 - 10.1103/PhysRevLett.99.021603

DO - 10.1103/PhysRevLett.99.021603

M3 - Article

SN - 0031-9007

VL - 99

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

ER -

Observation of CP violation in B-0 -> K+pi(-) and B-0 ->pi(+)pi(-)

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