Weak productions of new charmonium in semileptonic decays of B c
Weak productions of new charmonium in semileptonic decays of B c
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DOI：
10.1103/physrevd.77.054003
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发表时间：
2007-07
影响因子：
5
通讯作者：
Yu-Ming Wang;C. Lu
中科院分区：
文献类型：
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作者：
Yu-Ming Wang;C. Lu
本文研究了新的重介子eta '（c），h（c），h'（c），X '（c 0），X（3940），Y（3940），X（3872），Y（4260）在半轻子B（c）衰变中的弱产生.由于X（3940），Y（3940），X（3872），Y（4260）的组分至今仍没有明确的答案，我们将它们指定为激发粲偶素态，其可能的量子数受当前实验的限制。对于弱跃迁形状因子，我们采用光锥QCD求和规则方法进行计算，该方法已被证明是处理非微扰强子矩阵元的有力工具。我们的结果表明，X（3940）的不同解释会导致B（c）衰变产生率的显著差异，这将有助于在即将进行的LHC- B实验中阐明X（3940）的内部结构。此外，X（3872）和Y（3940）在B（c）衰变中的大的弱产生率以及B（c）→ Y（4260）的小的半轻子衰变率都依赖于它们的量子数J（PC）分配.此外，本文还讨论了B（c）弱衰变中各种矢量粲偶素态的S - D混合。根据我们的预测，未来对这些衰变的实验测量将测试这些粒子的内部结构。
We study the weak productions of novel heavy mesons, such as eta'(c), h(c), h'(c), X'(c0), X (3940), Y (3940), X (3872), and Y (4260), in the semileptonic B(c) decays. Since there is still no definite answer for the components of X (3940), Y (3940), X (3872), Y (4260) so far, we will assign them as excited charmonium states with the possible quantum numbers constrained by the current experiments. As for the weak transition form factors, we calculate them in the framework of the light- cone QCD sum rules approach, which has proven to be a powerful tool to deal with the nonperturbative hadronic matrix element. Our results indicate that different interpretations of X ( 3940 ) can result in a remarkable discrepancy of the production rate in the B(c) decays, which would help to clarify the inner structure of the X ( 3940 ) with the forthcoming LHC- b experiments. Besides, the predicted large weak production rates of X ( 3872 ) and Y ( 3940 ) in B(c) decays and the small semileptonic decay rate for B(c) -> Y ( 4260 ) all depend on their quantum number J(PC) assignments. Moreover, the S - D mixing of various vector charmonium states in the weak decay of B(c) is also discussed in this work. The future experimental measurements of these decays will test the inner structures of these particles, according to our predictions here.