Master integrals for all unitarity cuts of massless four-loop propagators

Abstract

Among the unitarity cuts of massless 4-loop propagators two classes have remained unknown until recently: 2-loop 3-particle cuts, and 1-loop 4-particle cuts. In this article we shall discuss the calculation that completes the master integrals for these cuts: both the motivation and the methods (including dimensional recurrence relations and direct integration at higher space-time dimensions).

Comments: 11 pages; contribution to the proceedings of RADCOR 2019; based on arXiv:1910.07522