Selection rules for helicity amplitudes in massive gauge theories

Abstract

After a rediscussion of the vanishing theorems for helicity amplitudes in unbroken gauge theories, we study the case of spontaneously broken gauge theories at high energy. The vanishing theorems generalize to a definite pattern of m/E-suppression of the amplitudes that vanish in the massless case, where E is the energy scale of the process and m is the mass of the gauge vectors. We use only elementary arguments, and as an application we show how these methods can be employed to understand some aspects of the effective W approximation in the polarized case.

18 pages. v2: minor modifications. v3: published version

References in corpus (3)

• The All-Loop Integrand For Scattering Amplitudes in Planar N=4 SYM
• All tree-level amplitudes in massless QCD
• Probing the Scattering of Equivalent Electroweak Bosons

Cited by in corpus (5)

• Helicity Selection Rules and Non-Interference for BSM Amplitudes
• An Equivalent Gauge and the Equivalence Theorem
• On-shell constructibility of Born amplitudes in spontaneously broken gauge theories
• Helicity Amplitudes for massive gravitinos in N=1 Supergravity
• CP sensitive observables of a hypothetical heavy spin-0 particle with $\gamma \gamma -$interactions dominant