Analytic Continuation of Mellin Transforms up to two-loop Order

Details Analytic Continuation of Mellin Transforms up to two-loop Order Analytic Continuation of Mellin Transforms up to two-loop Order

2000-03-10

arxiv.org/abs/hep-ph/0003100v1

Comput.Phys.Commun. 133 (2000) 76-104

Physics

High Energy Physics

High Energy Physics - Phenomenology

31 pages LATEX, 1 style file

Scientific paper

10.1016/S0010-4655(00)00156-9

The analytic continuation of the Mellin transforms to complex values of N for the basic functions $g_i(x)$ of the momentum fraction x emerging in the quantities of massless QED and QCD up to two-loop order, as the unpolarized and polarized splitting functions, coefficient functions, and hard scattering cross sections for space- and time-like momentum transfer are evaluated. These Mellin transforms provide the analytic continuations of all finite harmonic sums up to the level of the threefold sums of transcendentality four, where the basis-set ${g_i(x)}$ consists of products of {\sc Nielsen}-integrals up to transcendentality four. The computer code {\tt ANCONT} is provided.

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