QCD at Photon Colliders

Abstract

The novel possibilities of probing the photon structure and high energy limit of QCD at photon colliders are summarised. We discuss the photon structure function $F_2^{\gamma}(x,Q^2)$, the gluon distribution in the photon and the spin dependent structure function $g_1^{\gamma}(x,Q^2)$ of the photon and emphasise advantages of the photon colliders for measuring these quantities. The possibility of probing the QCD pomeron and odderon in $\gamma\gamma$ and $e \gamma$ collisions is also described.Comment: 14 pages with 3 postscript figures included, introductory talk given at the International Workshop on High Energy Photon Colliders, 14th - 17th June 2000, DESY, Hamburg, German