Parametrization of F-2(gamma) at low Q(2) and of sigma(gamma gamma) and sigma(gamma*gamma) at high energies - art. no. 074021

A parametrization of the real photon structure function F-2(gamma) in the l aw Q(2), low x region is formulated. It includes both the vector meson domi nance (VMD) and the QCD components, the latter suitably extrapolated to the low Q(2) region and based on arbitrary parton distributions in the photon. The parametrization used together with the Gluck, Reya, and Vogt (GRV) and Gluck, Reya, and Schienbein (GRS) parton densities describes reasonably we ll the existing high energy data on F-2(gamma), sigma(gamma gamma), and the low Q(2) data on sigma(gamma*gamma). Predictions for sigma(gamma gamma) an d for sigma(gamma*gamma) for energies which may become accessible in future linear colliders are also given.