Reduction formalism for dimensionally regulated one-loop N-point integrals

Details Reduction formalism for dimensionally regulated one-loop N-point integrals Reduction formalism for dimensionally regulated one-loop N-point integrals

1999-11-13

arxiv.org/abs/hep-ph/9911342v1

Nucl.Phys.B572:361-386,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages Latex, 1 eps figure

Scientific paper

10.1016/S0550-3213(00)00040-7

We consider one-loop scalar and tensor integrals with an arbitrary number of external legs relevant for multi-parton processes in massless theories. We present a procedure to reduce N-point scalar functions with generic 4-dimensional external momenta to box integrals in (4-2\epsilon) dimensions. We derive a formula valid for arbitrary N and give an explicit expression for N=6. Further a tensor reduction method for N-point tensor integrals is presented. We prove that generically higher dimensional integrals contribute only to order \epsilon for N>=5. The tensor reduction can be solved iteratively such that any tensor integral is expressible in terms of scalar integrals. Explicit formulas are given up to N=6.

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