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Paper   IPM / P / 7890
School of Physics
  Title:   Quark Distributions and Nucleon Spin Structure
1.  Ali N. Khorramian
2.  A. Mirjalili
3.  S. Atashbar Tehrani
  Status:   Published
  Journal: Int. J. Mod. Phys. A
  No.:  8&9
  Vol.:  20
  Year:  2005
  Pages:   1923-1926
  Supported by:  IPM
In this paper we calculate spin dependence of parton distributions and proton structure function. The polarized valon distributions in a proton and the polarized parton distri- butions inside the valon are necessary to obtain the polarized parton distributions in a proton. The results of our calculations for the proton structure function, xgp 1 are in good agreement with the available experimental data. We obtain the spin contribution and angular momentum of the valons to the proton.

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