An approach to the evaluation of three- and four-point ladder diagramsстатья
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Аннотация:An approach to the calculation of ladder graphs with three and four external lines is considered (in the case of massless internal particles and arbitrary external momenta). Simple formulae for reducing four-point diagrams to three-point vertices are derived. Exact results for diagrams up to the two-loop level are obtained in terms of polylogarithms.