Extraction of the proton parton density functions using a NLO-QCD fit of
            the ZEUS inclusive DIS and jet cross sections

                     ZEUS Collaboration

A NLO QCD analysis on ZEUS jet-production data and inclusive cross-section 
data, including data with polarised lepton beams, is presented. The 
analysis includes the most recent results on neutral current and charged 
current inclusive cross sections in e+p and e-p collisions extracted from 
the HERAII data, together with the NC cross sections measured at lower 
proton beam energy. The analysis is used to assess the impact of the most 
recent data on the parton distribution functions and their uncertainties.