Universality of the Weinberg theorem using helicity constraints

TL;DR

This paper demonstrates the universal applicability of the Weinberg theorem at higher-order corrections by deriving the soft operator through helicity constraint relations.

Contribution

It introduces a method to derive the soft operator using helicity constraints, extending the Weinberg theorem's universality to next-leading order.

Findings

We show the Weinberg theorem's universality at next-to-leading order.

Derived the soft operator from helicity constraints.

Confirmed the theorem's applicability beyond leading order.

Abstract

The factorisation of scattering amplitude is described by the Weinberg theorem. In this talk, we will show the universality of the theorem at the next leading correction of the soft expansion. For that we will derive the soft operator by solving helicity constraint relations.