Scaled momentum distributions of charged particles 
                 in dijet photoproduction at HERA

                     ZEUS Collaboration

                         Abstract

The scaled momentum distributions of charged particles in jets have been 
measured for dijet photoproduction with the ZEUS detector at HERA using an 
integrated luminosity of 359 pb-1. The distributions are compared to 
predictions based on perturbative QCD carried out in the framework of the 
modified leading-logarithmic approximation (MLLA) and assuming local 
parton-hadron duality (LPHD). The universal MLLA scale, Lambda_eff, and 
the LPHD parameter, kappa^ch, are extracted.