Scattering amplitudes with massive fermions using BCFW recursion

We study the QCD scattering amplitudes for qq -> gg and qq -> ggg 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.