The nf terms of the three-loop cusp anomalous dimension in QCD

Abstract

In this talk we present the result for the nf dependent piece of the three-loop cusp anomalous dimension in QCD. Remarkably, it is parametrized by the same simple functions appearing in analogous anomalous dimensions in N = 4 SYM at one and two loops. We also compute all required master integrals using a recently proposed refinement of the differential equation method. The analytic results are expressed in terms of harmonic poly logarithms of uniform weight.