Cleo Collaboration

Cleo Collaboration
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DOI:
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发表时间:
2008
期刊:
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影响因子:
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通讯作者:
S. Csorna;I. Dankó;K. W. McLean;S. Márka;Z. Xu;R. Godang;K. Kinoshita;I. Lai;S. Schrenk
S. Csorna;I. Dankó;K. W. McLean;S. Márka;Z. Xu;R. Godang;K. Kinoshita;I. Lai;S. Schrenk
中科院分区:
其他
文献类型:
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作者:
S. Csorna;I. Dankó;K. W. McLean;S. Márka;Z. Xu;R. Godang;K. Kinoshita;I. Lai;S. Schrenk

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我们已经在CLEO探测器记录的580万次B 0 → D * + D * −衰变中观察到了四个完全重构的候选者。背景估计为0.31 ± 0.10起事件。背景产生四个或更多信号候选者的概率为1.1 × 10 −4,并且在D * +和D * −衰变模式之间具有观察到的分布。测得的衰变率B(B 0 → D * + D * −)= [6.2 +4.0 −2.9(stat)± 1.0(syst)] × 10 −4,对于测量随时间变化的CP不对称性来说,这个衰变模式足够大。
We have observed four fully reconstructed B 0 → D * + D * − candidates in 5.8 million Υ(4S) → BB decays recorded with the CLEO detector. The background is estimated to be 0.31 ± 0.10 events. The probability that the background could produce four or more signal candidates with the observed distribution among D * + and D * − decay modes is 1.1 × 10 −4. The measured decay rate, B(B 0 → D * + D * −) = [6.2 +4.0 −2.9 (stat) ± 1.0(syst)] × 10 −4 , is large enough for this decay mode to be of interest for the measurement of a time-dependent CP asymmetry.