出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on the calculation of multi-loop Feynman integrals for single-scale problems by means
of difference equations in Mellin space. The solution to these difference equations in terms of
harmonic sums can be constructed algorithmically over difference fields, the so-calledPS∗-fields.
We test the implementaion of the Mathematica package Sigma on examples from recent higher
order perturbative calculations in Quantum Chromodynamics.
