A Young diagram expansion of the hexagonal Wilson loop (amplitude) in ${\cal N}=4$ SYM

TL;DR

This paper presents a novel Young diagram expansion for the hexagonal Wilson loop in ${ m extbf{N}=4}$ SYM, linking instanton calculus, localization, and combinatorics to compute scattering amplitudes.

Contribution

It introduces a Young diagram-based integral representation of the Wilson loop, enabling explicit calculations and recursion relations, advancing the understanding of scattering amplitudes in supersymmetric gauge theories.

Findings

Derived explicit formulas matching known results

Identified recursion properties of residues

Explicitly determined poles of the matrix part

Abstract

We shall interpret the null hexagonal Wilson loop (or, equivalently, six gluon scattering amplitude) in 4D ${\cal N}=4$ Super Yang-Mills, or, precisely, an integral representation of its matrix part, via an ADHM-like instanton construction. In this way, we can apply localisation techniques to obtain combinatorial expressions in terms of Young diagrams. Then, we use our general formula to obtain explicit expressions in several explicit cases. In particular, we discuss those already available in the literature and find exact agreement. Moreover, we are capable to determine explicitly the denominator (poles) of the matrix part, and find some interesting recursion properties for the residues, as well.