Counting master integrals: integration-by-parts procedure with effective mass

Abstract

We show that the new relation between master integrals recently obtained in Ref. [1] can be reproduced using the integration-by-parts technique implemented with an effective mass. In fact, this relation is recovered as a special case of a whole family of new relations between master integrals.

Comments: 4 pages, more general formula and figure are included, accepted for publication in Phys.Lett.B