Space- and time-like cut vertices in QCD beyond the leading order—The singlet sector

The analytic continuation relation found in the non-singlet structure of the processes e⁺h→e^?X and e^?e⁺→hX up to the next-to-the-leading-logarithm approximation, is shown to be true also for the singlet case. This relation is used to find the two-loop anomalous dimensions for the singlet time-like cut vertices from the anomalous dimension of the singlet space-like cut vertices. We give also the singlet time-like coefficient functions.