Helicity amplitudes for QCD with massive quarks
Abstract
The novel massive spinor-helicity formalism of Arkani-Hamed, Huang and Huang provides an elegant way to calculate scattering amplitudes in quantum chromodynamics for arbitrary quark spin projections. In this note we compute two families of tree-level QCD amplitudes with one massive quark pair and n-2 gluons. The two cases include all gluons with identical helicity and one opposite-helicity gluon being color-adjacent to one of the quarks. Our results naturally incorporate the previously known amplitudes for both quark spins quantized along one of the gluonic momenta. In the all-multiplicity formulae presented here the spin quantization axes can be tuned at will, which includes the case of the definite-helicity quark states.
Cite
@article{arxiv.1802.06730,
title = {Helicity amplitudes for QCD with massive quarks},
author = {Alexander Ochirov},
journal= {arXiv preprint arXiv:1802.06730},
year = {2018}
}
Comments
v3 conventions tweaked to match further work by author, supersedes journal version