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We consider the factorization properties of on-shell QCD amplitudes withmassive partons in the limit when all kinematical invariants are large comparedto the parton mass and discuss the structure of their infrared singularities.The dimensionally regulated soft poles and the large collinear logarithms ofthe parton masses exponentiate to all orders. Based on this factorization asimple relation between massless and massive scattering amplitudes in gaugetheories can be established. We present recent applications of this relationfor the calculation of the two-loop virtual QCD corrections to thehadro-production of heavy quarks.

Massive QCD amplitudes at higher orders