Standard and hypergeometric representations for loop diagrams and the photon-photon scattering

Abstract

By using the example of photon-photon scattering box diagrams, different representations for loop integrals are discussed. A connection between hypergeometric representation and dilogarithms is derived. An explicit analytic continuation formula to large values of Mandelstam variables is constructed.

8 pages, to appear in: Proc. Intern. Conf. "Quarks-92" (Zvenigorod, Russia, May 1992), World Scientific, Singapore, 1993

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