QCD Analysis of the Polarized World Data

Abstract

The results of a recent next-to-leading order QCD analysis of the world data on polarized deep inelastic scattering are reported. New parameterizations are derived for the quark and gluon distributions and the value of ${\alpha }_s(M_z^2)$ is determined. We obtain ${\alpha }_s^{\mathrm{NLO}}(M_Z^2)=0.1132\begin{array}{l}+0.0056\\ -0.0095\end{array}$. Potential higher twist contributions to the structure function $g_1(x,Q^2)$ are considered.

6 pages, 2 Figures, DIS2010 Proceedings, PoS

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• A new approach to calculate the gluon polarization
• Observation of quark-hadron duality in gamma*-p helicity cross sections
• Comments on the Blumlein-Bottcher determination of higher twist corrections to the nucleon spin structure function g_1