论文标题

超子弱辐射衰减

Hyperon Weak Radiative Decay

论文作者

Niu, Peng-Yu, Richard, Jean-Marc, Wang, Qian, Zhao, Qiang

论文摘要

我们在非相关成分夸克模型的框架中重新审视超子弱辐射衰变。这项研究证实了由极限术语主导的超子弱辐射过渡算子的非本地特征,并且可以实现对Cabibbo最喜欢的超子弱辐射衰减的可用实验数据的总体自洽描述。它提供了一种自然机制来逃避HARA定理,在该定理中,较大的奇偶差异贡献可以来自中间轨道激发。极术语之间的取消还解释了实验数据表现出的显着SU(3)风味对称性破坏。我们还讨论了由电磁或弱相互作用顶点产生的几个有趣的选择规则。这些特征表明不同超子衰减之间的非平凡关系。

We revisit the hyperon weak radiative decays in the framework of the non-relativistic constituent quark model. This study confirms the nonlocal feature of the hyperon weak radiative transition operators which are dominated by the pole terms, and an overall self-consistent description of the available experimental data for the Cabibbo-favored hyperon weak radiative decays is achieved. It provides a natural mechanism for evading the Hara theorem, where sizeable parity-violating contributions can come from the intermediate orbital excitations. Cancellations between pole terms also explain significant SU(3) flavor symmetry breaking manifested by the experimental data. We also discuss several interesting selection rules arising from either the electromagnetic or the weak interaction vertices. These features suggest nontrivial relations among different hyperon decays.

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