Recent developments for multi-leg QCD amplitudes with massive particles

TL;DR

This paper reviews recent advances in calculating QCD helicity amplitudes involving massive particles, emphasizing supersymmetric identities, recursion relations, and extended CSW rules to improve computational methods.

Contribution

It introduces new extensions of modern amplitude techniques to massive particles, including supersymmetric Ward identities, on-shell recursion, and CSW rules for massive scalars.

Findings

Supersymmetric Ward identities relate massive quark and scalar amplitudes.

On-shell recursion relations are adapted for massive quark amplitudes.

CSW rules are extended to include massive scalars.

Abstract

We review the extension of modern techniques for the calculation of helicity amplitudes in QCD to massive particles. The focus is on the use of supersymmetric Ward identites that relate amplitudes with massive quarks to those with massive scalars, the application of on-shell recursion relations to amplitudes with massive quarks and an extension of the CSW rules to massive scalars.