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Loop Integrals, R Functions and their Analytic Continuation

L. Bruecher, J. Franzkowski, D. Kreimer

hep-tharXiv:hep-th/9307055

Abstract

To entirely determine the resulting functions of one-loop integrals it is necessary to find the correct analytic continuation to all relevant kinematical regions. We argue that this continuation procedure may be performed in a general and mathematical accurate way by using the R function notation of these integrals. The two- and three-point cases are discussed explicitly in this manner.

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