The 18th International Symposium on Spin Physics

October 6-11, 2008
University of Virginia
Charlottesville, VA USA

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First Name Alinaghi
Last Name Khorramian
Affiliation IPM and Semnan university
Co-Authors S. Atashbar Tehrani
Title QCD analysis for the polarized parton densities and structure function
Topic 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.