Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-05
Nucl.Phys. B516 (1998) 385-401
Physics
High Energy Physics
High Energy Physics - Phenomenology
to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(98)00065-0
We propose a framework for calculating two-loop Feynman diagrams which appear within a renormalizable theory in the general mass case and at finite external momenta. Our approach is a combination of analytical results and of high accuracy numerical integration, similar to a method proposed previously for treating diagrams without numerators. We reduce all possible tensor structures to a small set of scalar integrals, for which we provide integral representations in terms of four basic functions. The algebraic part is suitable for implementing in a computer program for the automatic generation and evaluation of Feynman graphs. The numerical part is essentially the same as in the case of Feynman diagrams without numerators.
Ghinculov Adrian
Yao York-Peng
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