Scattering amplitudes with massive fermions using BCFW recursion
Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
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Published online: 28 September 2006
We study the QCD scattering amplitudes for and where q is a massive fermion. Using a particular choice of massive fermion spinor we derive compact expressions for the partial spin amplitudes for the 2→2 process. We then investigate the corresponding 2→3 amplitudes using the BCFW recursion technique. For the helicity conserving partial amplitudes we present new expressions, but we were unable to treat the helicity-flip amplitudes recursively, except for the case where all the gluon helicities are the same. We therefore evaluate the remaining partial amplitudes using standard Feynman diagram techniques.
© Springer-Verlag Berlin Heidelberg, 2006