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arXiv 2102.11440hep-phhep-th
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一个粒子衰变为两个任意自旋的无质量粒子的选择定则

Selection rules for the decay of a particle into two identical massless particles of any spin

Seong Youl Choi, Jae Hoon Jeong

摘要:

将著名的关于中性粒子衰变为两个光子的朗道-杨(LY)定理推广到分析中性粒子或带电粒子衰变为两个相同的无质量粒子。根据离散宇称不变性和玻色/费米对称性,在螺旋度公式中给出了选择规则。导出了洛伦兹协变三重顶点的一般形式,并在Jacob-Wick约定下计算了相应的衰变螺旋度振幅。在检验了由两种互补方法得到的所有解析结果的一致性之后,我们提取出了广义LY定理的关键方面。

英文摘要:

The well-known Landau-Yang (LY) theorem on the decay of a neutral particle into two photons is generalized for analyzing the decay of a neutral or charged particle into two identical massless particles of any spin. Selection rules categorized by discrete parity invariance and Bose/Fermi symmetry are worked out in the helicity formulation. The general form of the Lorentz-covariant triple vertices are derived and the corresponding decay helicity amplitudes are explicitly calculated in the Jacob-Wick convention. After checking the consistency of all the analytic results obtained by two complementary approaches, we extract out the key aspects of the generalized LY theorem.

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