Inclusive charged particle distributions in deep inelastic scattering events at HERA

Abstract

A measurement of inclusive charged particle distributions in deep inelasticep scattering forγ*p centre-of-mass energies 75<W<175 GeV and momentum transfer squared 10<Q ²<160 GeV² from the ZEUS detector at HERA is presented. The differential charged particle rates in theγ*p centre-of-mass system as a function of the scaled longitudinal momentum,x _F, and of the transverse momentum,p* _t and 〈p* _t ²〉, as a function ofx _F, W andQ ² are given. Separate distributions are shown for events with (LRG) and without (NRG) a rapidity gap with respect to the proton direction. The data are compared with results from experiments at lower beam energies, with the naive quark parton model and with parton models including perturbative QCD corrections. The comparison shows the importance of the higher order QCD processes. Significant differences of the inclusive charged particle rates between NRG and LRG events at the sameW are observed. The value of 〈p* _t ²〉 for LRG events with a hadronic massM _x, which excludes the forward produced baryonic system, is similar to the 〈p* _t ²〉 value observed in fixed target experiments atW≈M _x.