The Parton Structure of Real Photons

Abstract

The QCD treatment of the photon structure is recalled. Emphasis is given to the recently derived momentum sum rule, and to the proper choice of the factorization scheme and/or boundary conditions for the evolution equations beyond the leading order. Parametrizations of the photon's parton content are examined and compared. The small-x behaviour of the photon structure is briefly discussed.

Comments: 14 pages LaTeX, including 6 eps-figures. Invited talk presented at PHOTON '97, Egmond aan Zee, The Netherlands, May 1997. To appear in the proceedings