Counting the number of master integrals for sunrise-type Feynman diagrams via Mellin-Barnes representation

Abstract

A number of irreducible master integrals for L-loop sunrise-type and bubble Feynman diagrams with generic values of masses and external momenta are explicitly evaluated via Mellin-Barnes representation.

Comments: 28 pages, 3 figures, ver2. some typos corrected and a few references added; ver3.has some relatively minor corrections; accepted for publication in JHEP