The Fragmentation of Quarks in DIS and Strangeness in Photoproduction in

Abstract

Deep Inelastic scattering (DIS) data, taken in 1993 by the H1 experiment at HERA. The fragmentation function of the quark is examined in the Breit frame of reference and compared with e + e \Gamma data. The measured area, peak and width of the fragmentation function shows that the kinematic evolution variable equivalent to the e + e \Gamma squared centre of mass energy is the invariant square of the four-momentum transfer. The comparison of the differential K 0 s cross-section with the measured inclusive charged particle cross-section shows the contribution of strangeness in photoproduction events. Comparisons of the measured cross-sections with QCD based Monte Carlo models including leading order matrix elements and fragmentation effects are presented. 1. ep Collider Kinematics The HERA collider at DESY, which delivered the first ep interactions in 1992, has opened new kinematical domains in deep inelastic lepton-nucleon scattering in both the small x (Bjorken scaling vari..