NEW PARTON DISTRIBUTION-FUNCTIONS FOR THE PHOTON

We present new improved parton distributions for the photon, We fit al l available data on the photon structure function, F-2(gamma)(x, Q(2)) , with Q(2) greater than or equal to 3 GeV2, in order to determine the quark distributions, We also pay particular attention to the gluon di stribution in the photon, g(gamma)(x, Q(2)), which has been poorly con strained in earlier analyses which only include structure function dat a. We use large p(T) jet production in gamma gamma collisions from TRI STAN to constrain g(gamma). We also see what information can be gleane d from gamma p collisions at HERA on g(gamma) and on the quark distrib utions at large x, where there are no structure function data. We revi ew future prospects of elucidating the parton distributions of the pho ton. (C) 1997 Published by Elsevier Science B.V.