Abstract
The parton momentum densities in the proton are determined from a NLO QCD analysis of structure functions measured by HERA and fixed target experiments. Also included are data on the difference of the up and down anti-quark densities. The uncertainties in the parton densities, structure functions and related cross sections are estimated from the experimental errors, taking into account all correlations. Standard Model predictions of the charged current Born cross sections at large x and Q 2 are calculated and compared with recent data from ZEUS.
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