arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0707.1272hep-ph
收藏

关于Uppermum(3S)-Uppermum(1 S)pi pi衰变幅度的注记

Remarks on the amplitude of the decay Upsilon(3S) -> Upsilon(1S) pi pi

S. Dubynskiy, M. B. Voloshin

摘要:

我们指出的一些性质的双介子跃迁$Υ(3S) \to Υ(1S) ππ$的振幅在最近报道的结果的CLEO分析的形状因子在这个振幅。我们发现,在第三形状因子为零的假设下,报告的两个形状因子之间的显着的复杂相位,是不一致的图片,其中的相移出现由于在$ππ$信道中的最终状态的相互作用。它还表明,在分析中,使用初始和最终的$Υ$共振的极化上没有信息,它是不可能的原则上确定所有的相关条款。我们认为,一个简单的相关性的研究的两个π介子的总动量的方向和初始光束的轴是足够的解决在适合的形状因子的模糊性。

英文摘要:

We point out some properties of the amplitude of the dipion transition $Υ(3S) \to Υ(1S) ππ$ in relation to the recently reported results of a CLEO analysis of form factors in this amplitude. We find that the reported significant complex phase between two of the form factors under the assumption that the third form factor is zero, is not consistent with the picture where the phase shifts arise due to the final state interaction in the $ππ$ channel. It is also shown that in an analysis that uses no information on the polarization of both the initial and the final $Υ$ resonances it is impossible in principle to determine all the relevant terms. We suggest that a study of a simple correlation between the direction of the total momentum of the two pions and the axis of the initial beams is sufficient to resolve the ambiguity in the fit for the form factors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑