Measurement of scaled momentum spectra in the current region of the Breit frame with ZUES at HERA

Charged particle production was studied in deep inelastic
scattering (DIS) with ZEUS at HEAR using an integrated luminosity 
of about 0.5 fb-1. The evolution of scaled momentum distributions 
as a function of Q2 was investigated in the current fragmentation 
region of the Breit frame. The fragmentation properties 
of the struck quark in DIS are compared to next-to-leading order
calculations with the fragmentation functions obtained from e+e-
experiments. Scaling violations are observed. The scaled momentum
spectra are compared to modified leading-logarithmic QCD approximation
and to Monte Carlo event generators. In addition, the limiting
spectrum was investigated and compared to the results from e+e-
experiments.