The $n_{f}$ terms of the three-loop cusp anomalous dimension in QCD
  In this talk we present the result for the $n_f$ 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 ${\mathcal N}=4$ 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 polylogarithms of uniform weight. 
Andrey Grozin, Johannes M. Henn, Gregory P. Korchemsky, Peter Marquard
hep-th hep-ph