Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-03-17
Nucl.Phys.B636:225-263,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
43 pages LATEX, 1 style files, 13 eps-figures, final version, Nucl. Phys. B in print
Scientific paper
10.1016/S0550-3213(02)00342-5
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 $x \epsilon [10^{-9},1], Q^2 \epsilon [1,10^6] \GeV^2$. The extrapolation far outside the domain of the current measurements is given both to allow for applications at higher values of $Q^2$ and to be able to calculate integral properties of the present distributions. The values of $\Lambda_{\rm QCD}$ and $\alpha_s(M_z)$ are determined. Emphasis is put on the derivation of the fully correlated $1\sigma$ 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 $\alpha_s$ is studied. Finally we perform a factorization--scheme invariant QCD analysis based on the observables $g_1(x,Q^2)$ and $d g_1(x,Q^2)/d \log(Q^2)$ in next-to-leading order, which is compared to the standard analysis. A series of low moments of parton densities, accounting for error correlation, are given to allow for comparison with results from lattice simulations.
Blümlein Johannes
Bottcher Helmut
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