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Qcd analysis of polarized deep inelastic scattering data and parton distributions, Nucl. Phys. B636

By Johannes Blümlein and Helmut Böttcher


A QCD analysis of the world data on polarized deep inelastic scattering is presented in leading and next-to-leading order. New parameterizations are derived for the quark and gluon distributions for the kinematic range x ǫ [10 −9,1], Q 2 ǫ [1,10 6] GeV 2 and the value of ΛQCD and αs(Mz) are determined. Emphasis is put on the derivation of the fully correlated 1σ error bands for these distributions, which are also given in terms of parameterizations and are directly applicable to determine experimental errors of other polarized observables. The impact of the variation of both the renormalization and factorization scales on the value of αs is studied. Finally we perform a factorization–scheme invariant QCD analysis based on the observables g1(x,Q 2) and dg1(x,Q 2)/dlog(Q 2) in next-to-leading order, which is compared to the standard analysis. A series of low moments of parton densities, accounting The nature of the short-distance structure of polarized nucleons is one of the central questions of present day hadron physics. Nucleons are composite fermions and their spin should be obtained as a superposition of the spins and angular momenta of its constituents, the quarks and gluons

Year: 2002
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