On higher order corrections to photon structure functions

Abstract

The QCD corrections to photon structure functions are defined in a way consistent with the factorization scheme invariance. It is shown that the conventional DIS${}_{\gamma }$ factorization scheme does not respect this invariance and is thus deeply flawed. The origins of the divergent behavior of photonic coefficient function at large $x$ are analyzed and recipe to remove it is suggested.

Comments: 14 pages, 2 eps figures, couple of typos and misprints corrected