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Next-to-leading order QCD analyses of the ZEUS data on deep inelasticscattering together with fixed-target data have been perfomed, from which thegluon and the quark densities of the proton and the value of the strongcoupling constant, alpha_s(M_Z), were extracted. The study includes a fulltreatment of the experimental systematic uncertainties including point-to-pointcorrelations. The resulting uncertainties in the parton density functions arepresented. A combined fit for alpha_s(M_Z) and the gluon and qurak densitiesyields a value of alpha_s(M_Z) in agreement with the world average. The partondensity functions derived from ZEUS data alone indicate the importance of HERAdata in determining sea quark and gluon distributions at low x. The limits ofapplicability of the theoretical formalism have been explored by comparing thefit predictions to ZEUS data at very low Q^2.

ZEUS next-to-leading-order QCD analysis of data on deep inelastic scattering