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First observation of radiative B-0 -> phi K-0 gamma decays and measurements of their time-dependent CP violation
Belle Collaboration
2011
发表期刊PHYSICAL REVIEW D
卷号84期号:7
通讯作者Sahoo, H (reprint author), Univ Hawaii, Honolulu, HI 96822 USA.
摘要We report the first observation of the radiative decay B-0 -> phi K-0 gamma using a data sample of 772 x 10(6) B (B) over bar pairs collected at the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. We observe a signal of 37 +/- 8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B-0 ->phi K-0 gamma) = (2.74 +/- 0.60 +/- 0.32) x 10(-6), where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S-phi K0s gamma = +0.74(-1.05)(+0.72)(stat)(-0.024)(+0.10)(syst) and A phi(0)(Ks)gamma = +0.35 +/- 0.58(stat)(-0.10)(+0.23)(syst). Furthermore, we measure B(B+ -> phi K+gamma) = (2.48 +/- 0.30 +/- 0.24) x 10(-6), A(CP) = -0.03 +/- 0.11 +/- 0.08, and find that the signal is concentrated in the M-phi K mass region near threshold.
关键词BELLE
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.84.071101
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000296526200001
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213126
专题实验物理中心
作者单位中国科学院高能物理研究所
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Belle Collaboration. First observation of radiative B-0 -> phi K-0 gamma decays and measurements of their time-dependent CP violation[J]. PHYSICAL REVIEW D,2011,84(7).
APA Belle Collaboration.(2011).First observation of radiative B-0 -> phi K-0 gamma decays and measurements of their time-dependent CP violation.PHYSICAL REVIEW D,84(7).
MLA Belle Collaboration."First observation of radiative B-0 -> phi K-0 gamma decays and measurements of their time-dependent CP violation".PHYSICAL REVIEW D 84.7(2011).
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