Abstract
We present the results of our QCD analysis for polarized quark distribution and structure function xg1(x,Q2). Polarized parton distributions and structure functions of the nucleon are analyzed in the improved valon model. The Polarized valon distribution in a proton and the polarized parton distributions inside the valon are necessary to obtain the polarized parton distributions in a proton. Jacobi polynomial method is used to extract the unknown parameters of the polarized valon distributions by fitting to the available experimental data. The predictions for the NLO calculations of the polarized parton distribution functions are in good agreement with other theoretical models.
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