arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.2533hep-ph
收藏

P波介子的超精细小分裂如何避开大圈修正

How the small hyperfine splitting of P-wave mesons evades large loop corrections

T. J. Burns

摘要:

bottomonia态h_b(1P)和h_b(2P)的发现证实了夸克模型的预言,即P波介子的超精细分裂是很小的。惊人的协议是有点令人惊讶的,因为非相对论性的结果,其中分裂为零,可能会修改,由于大的质量变化,从耦合到开放味介子对。本文是基于这样的观察,即在大多数模型中,超精细分裂仍然很小,尽管在许多情况下是大的质量移位。这种效应被证明是模型的一个通用特征,其中耦合是通过创建自旋一对来驱动的。

英文摘要:

The recent discoveries of the bottomonia states h_b(1P) and h_b(2P) confirm the quark model prediction, already verified in the charmonia sector, that the hyperfine splitting of P-wave mesons is very small. The striking agreement is somewhat surprising because the non-relativistic result, for which the splitting is zero, may be modified due to large mass shifts from coupling to open flavour meson pairs. This paper is based on the observation that in most models hyperfine splitting remains small despite what are in many cases large mass shifts. This effect is shown to be a generic feature of models in which the coupling is driven by the creation of a spin-one pair.

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。

↑