The Singular Behaviour of QCD Amplitudes at Two-loop Order

  title={The Singular Behaviour of QCD Amplitudes at Two-loop Order},
  author={Stefano Catani},
We discuss the structure of infrared singularities in on-shell QCD amplitudes at two-loop order. We present a general factorization formula that controls all the ǫ-poles of the dimensionally regularized amplitudes. The dependence on the regularization scheme is considered and the coefficients of the 1/ǫ, 1/ǫ and 1/ǫ poles are explicitly given in the most general case. The remaining singlepole contributions are also explicitly evaluated in the case of amplitudes with a qq̄ pair. CERN–TH/98-42… CONTINUE READING
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