FACTORIZATION PROPERTIES OF THE DIFFRACTION DISSOCIATION OF LONGITUDINAL PHOTONS

We develop the pQCD description of the diffraction dissociation (DD) o f longitudinal photons. We demonstrate that the longitudinal diffracti ve structure function does not factor into the Aux of pomerons and the partonic structure function of the pomeron, thus defying the usually assumed Regge factorization. In contrast to DD of the transverse photo ns, DD of the longitudinal photons is strongly peaked at beta = 1. We comment on duality properties of DD in deep inelastic scattering.