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