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

A. I. Davydychev

hep-pharXiv:hep-ph/9307323

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.

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