On-Shell Recurrence Relations for One-Loop QCD Amplitudes

Details On-Shell Recurrence Relations for One-Loop QCD Amplitudes On-Shell Recurrence Relations for One-Loop QCD Amplitudes

2005-01-31

arxiv.org/abs/hep-th/0501240v3

Phys.Rev.D71:105013,2005

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, 3 figures; v2 minor corrections; v3 additional motivation for contribution under double pole, more minor corrections

Scientific paper

10.1103/PhysRevD.71.105013

We present examples of on-shell recurrence relations for determining rational functions appearing in one-loop QCD amplitudes. In particular, we give relations for one-loop QCD amplitudes with all legs of positive helicity, or with one leg of negative helicity and the rest of positive helicity. Our recursion relations are similar to the tree-level ones described by Britto, Cachazo, Feng and Witten. A number of new features arise for loop amplitudes in non-supersymmetric theories like QCD, including boundary terms and double poles. We show how to eliminate the boundary terms, which would interfere with obtaining useful relations. Using the relations we give compact explicit expressions for the n-gluon amplitudes with one negative-helicity gluon, up through n=7.

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