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arXiv 0804.4635hep-phhep-ex
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Bottomonium双π跃迁

Bottomonium dipion transitions

Yu. A. Simonov, A. I. Veselov

摘要:

亚阈值bottomonium水平$Υ(nS)\to Υ(n'S) ππ$与$n>n', n=2,3,4, n'=1,2$的双介子跃迁的手征衰变拉格朗日的框架中进行了研究,推导较早。通道$B\bar B, B\bar B^*+ c.c, B^* \bar B^*$被认为是在中间状态和$Υ(n S),B$和$B^*$的实际波函数中使用的重叠矩阵元素。施加阿德勒零的过渡矩阵元的要求,得到2D和1D的双介子光谱与实验合理的协议。

英文摘要:

Dipion transitions of the subthreshold bottomonium levels $Υ(nS)\to Υ(n'S) ππ$ with $n>n', n=2,3,4, n'=1,2$ are studied in the framework of the chiral decay Lagrangian, derived earlier. The channels $B\bar B, B\bar B^*+ c.c, B^* \bar B^*$ are considered in the intermediate state and realistic wave functions of $Υ(n S),B$ and $B^*$ are used in the overlap matrix elements. Imposing the Adler zero requirement on the transition matrix element, one obtains 2d and 1d dipion spectra in reasonable agreement with experiment.

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