  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.
