Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-08-16
Phys.Rev.D67:012007,2003
Physics
High Energy Physics
High Energy Physics - Experiment
42 pages, 18 figures, 4tables; very small changes to clarify text in response to referee's comments: accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.67.012007
Next-to-leading order QCD analyses of the ZEUS data on deep inelastic scattering together with fixed-target data have been perfomed, from which the gluon and the quark densities of the proton and the value of the strong coupling constant, alpha_s(M_Z), were extracted. The study includes a full treatment of the experimental systematic uncertainties including point-to-point correlations. The resulting uncertainties in the parton density functions are presented. A combined fit for alpha_s(M_Z) and the gluon and qurak densities yields a value of alpha_s(M_Z) in agreement with the world average. The parton density functions derived from ZEUS data alone indicate the importance of HERA data in determining sea quark and gluon distributions at low x. The limits of applicability of the theoretical formalism have been explored by comparing the fit predictions to ZEUS data at very low Q^2.
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