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