Weyl-van der Waerden formalism for helicity amplitudes of massive particles

被引：122

作者：

Dittmaier, S ^{[1
]}

机构：

[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland

来源：

PHYSICAL REVIEW D | 1999年 / 59卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.59.016007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Weyl-van der Waerden spinor technique for calculating helicity amplitudes of massive and massless particles is presented in a form that is particularly well suited to a direct implementation in computer algebra. Moreover, we explain how to exploit discrete symmetries and how to avoid unphysical poles in amplitudes in practice. The efficiency of the formalism is demonstrated by giving explicit compact results for the helicity amplitudes of the processes gamma gamma -->f (f) over bar, f (f) over bar --> gamma gamma gamma, mu(-) mu(+) --> f (f) over bar gamma. [S0556-2821(99)02101-3].

引用

页数：14

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