Born amplitudes in QCD from scalar diagrams
Christian Schwinn (RWTH Aachen), Stefan Weinzierl (Mainz University)
TL;DR
This paper reviews recent methods for calculating Born amplitudes in QCD, focusing on scalar diagram techniques and their generalization to multiple quark pairs, including massive quarks.
Contribution
It introduces a scalar propagator approach with specific vertices that simplifies the calculation of QCD Born amplitudes, generalizing to multiple quark pairs.
Findings
Scalar diagram methods effectively compute gluon helicity amplitudes.
Approach generalizes to any number of quark pairs, massless or massive.
Simplifies calculations compared to traditional methods.
Abstract
We review recent developments for the calculation of Born amplitudes in QCD. This includes the computation of gluon helicity amplitudes from MHV vertices and an approach based on scalar propagators and a set of three- and four-valent vertices. The latter easily generalizes to amplitudes with any number of quark pairs. The quarks may be massless or massive.
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