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Inclusive charged particle distributions in deep inelastic scattering events at HERA
A measurement of inclusive charged particle distributions in deep inelastic
scattering for centre-of-mass energies ~GeV and
momentum transfer squared ~GeV from the ZEUS detector at
HERA is presented. The differential charged particle rates in the
centre-of-mass system as a function of the scaled longitudinal momentum, ,
and of the transverse momentum, and , as a
function of , and 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 same are observed.
The value of for LRG events with a hadronic mass
, which excludes the forward produced baryonic system, is similar to the
value observed in fixed target experiments at .Comment: 34 pages, latex, 9 figures appended as uuencoded file. Author list
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