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Paper   IPM / P / 7227
School of Physics
  Title:   Direct Extraction of Polarized Parton Distributions in the Valon Model, Using Brenstein Polynomials
  Author(s): 
1.  S. Atashbar
2.  Ali N. Khorramian
3.  A. Mirjalili
  Status:   Preprint
  Journal:
  No.:  0
  Year:  2003
  Supported by:  IPM
  Abstract:
A valon is defined as a valence quark plus its associated sea quarks and gluons due to dressing processes in QCD. Here for the first time we introduce polarized valon distributions to describe the spin dependence of parton distributions. This can be done by having polarized valon distributions and polarized parton distributions inside the valon. Bernstein polynomial averages are used to compare parametrised valon distribution QCD prediction to the xg1p of E143 and SMC data and direct fits for unknown parameters over the range 3 ≤ Q2 ≤ 10 GeV2 were performed. By computing internal structure of polarized valons and using their distributions in the proton, we calculated the polarized proton structure function. It is shown that the results of the calculations agree rather well with the available experimental data . Our results for first moment of proton ,Γ1P, are in good agreement as well with experimental data for some value of Q2. We calculated as well the spin contribution of valons and proton.

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