A measurement of the inclusive cross-section for the photoproduction of protons in the central fragmentation region at HERA is presented. The measured cross-section is compared with the prediction of the PYTHIA MC model. The obtained value of the diquark suppression factor in the Lund string model is different from that obtained in e⁺e^- data. The dependence of the cross-section as a function of the transverse mass M_T is shown to be similar for different hadrons produced in photoproduction at HERA.

PACS numbers: 13.60.Rj, 13.85.Ni