Massive Quark-Gluon Scattering Amplitudes at Tree Level

Abstract

Results for four-, five-, and six-parton tree amplitudes for massive quark-antiquark scattering with gluons are calculated using the recursion relations of Britto, Cachazo, Feng, and Witten. The required diagrams are generated using shifts of the momenta of a pair of massless legs to complex values. Checks verifying the calculations are described, and a simple formula for the shifted spinors of an internal gluon is presented.

24 pages, 6 figures

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• On-shell recursion for massive fermion currents
• Twistor-inspired construction of massive quark amplitudes
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