Key points are not available for this paper at this time.
Photon production via deep inelastic quark and gluon fragmentation is studied beyond the leading perturbative order within the framework of a specific factorization scheme (DIS_) chosen to provide the maximally possible amount of perturbative stability. It is argued that the perturbative (pointlike) results are expected to present a realistic estimate for photonic fragmentation functions, and the ambiguities related to the presently unknown, but possibly small, nonperturbative hadronic contributions are pointed out.
Glück et al. (1993) studied this question.