The 18th International Symposium on Spin Physics October 6-11, 2008University of VirginiaCharlottesville, VA USA

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First Name Alinaghi Khorramian khorramiana@theory.ipm.ac.ir IPM and Semnan university S. Atashbar Tehrani QCD analysis for the polarized parton densities and structure function Oral Abstract of 200 words or less We present the results of our QCD analysis for polarized quark distribution and structure function $xg_1 (x,Q^2)$. New parameterizations are derived for the quark and gluon distributions for the kinematic range $x\;\epsilon\;[10^{-8},1]$, $Q^2\;\epsilon\;[1,10^6]$ GeV$^2$. The analysis is based on the Jacobi polynomials expansion of the polarized structure functions. The values of $\Lambda_{QCD}$ and $\alpha_s(M_z)$ are determined.