On threshold amplitudes II: Amplitudes nullification via classical symmetries

TL;DR

This paper explores how classical symmetries lead to Ward identities that nullify certain tree-level amplitudes, providing insights into amplitude behavior through symmetry principles.

Contribution

It demonstrates the derivation of Ward identities from classical symmetries and applies these to specific 2 into n amplitudes, revealing nullification conditions.

Findings

Ward identities derived from classical symmetries

Nullification of certain tree-level amplitudes

Application to specific 2 into n processes

Abstract

The Ward identities for amplitudes at the tree level are derived from symmetries of the corresponding classical dynamical systems. The results are applied to some 2 into n amplitudes.