DIS coefficient functions at four loops in QCD and beyond

Abstract

We report results for the lowest even- N moments of the flavor-nonsinglet structure functions F 2 and F L in QCD at the fourth order in the perturbative expansion in the strong coupling constant α s . Our results are presented in numerical form and we compare them with the leading and subleading terms of the threshold expansion for large values of N , which corresponds to the limit x → 1.