Reduction formalism for dimensionally regulated one loop N point integrals
Reduction formalism for dimensionally regulated one loop N point integrals
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DOI:
10.1016/s0550-3213(00)00040-7
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发表时间:
1999-11
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影响因子:
--
通讯作者:
T. Binoth;J. Guillet;G. Heinrich;G. Heinrich
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文献类型:
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作者:
T. Binoth;J. Guillet;G. Heinrich;G. Heinrich
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 (4−2ϵ) 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 ϵ 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.