Simplifying algebra in Feynman graphs. II. Spinor helicity from the spacecone

被引：52

作者：

Chalmers, G ^{[1
]}

Siegel, W ^{[1
]}

机构：

[1] SUNY Stony Brook, Inst Theoret Phys, Stony Brook, NY 11794 USA

来源：

PHYSICAL REVIEW D | 1999年 / 59卷 / 04期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.59.045013

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Manifestly Lorentz-covariant Feynman rules are given in terms of a "scalar" field for each helicity, dramatically simplifying the calculation of amplitudes with massless particles. The spinor helicity formalism is properly identified as a null complex spacelike (not lightlike) gauge, where two massless external momenta define the reference frame. Usually, this gauge is applied only to external line factors; we extend this method to vertices and propagators by modifying the action itself using light-cone methods. [S0556-2821(98)05324-7].

引用

页数：9

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