Why and how to use a differential equation method to calculate multi-loop integrals

Abstract

A short pedagogical introduction to a differential method used to calculate multi-loop scalar integrals is presented. As an example it is shown how to obtain, using the method, large mass expansion of the two loop sunrise master integrals.

Comments: 9 p., presented at XXV International Conference on Theoretical Physics "Particle Physics and Astrophysics in the Standard Models and Beyond", Ustron, Poland, September 2001