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Paper   IPM / Physic / 8318
School of Physics
  Title:   The NLO QCD Calculation of Sea Quark Distributions in the CORGI Approach, Based on the Constituent Quark Model
  Author(s): 
1.  A. Mirjalili
2.  K. Keshavarzian
  Status:   Published
  Journal: Int. J. Mod. Phys. A
  No.:  24
  Vol.:  22
  Year:  2007
  Pages:   4519-4535
  Supported by:  IPM
  Abstract:
Sea quark distributions in the NLO approximation, based on the phenomenological valon model or constituent quark model are analyzed. We use the parameterized Inverse Mellin transform technique to perform a direct fit with available experimental data and obtain the unknown parameters of the distributions. We try to extend the calculation to the NLO approximation for the singlet and non-singlet cases in DIS phenomena. We do also the same calculation for electron-positron annihilation. The resulting sea distributions are effectively independent of the process used. The approach of complete RG improvement(CORGI) is employed and the results are compared with the standard approach of perturbative QCD in the MS scheme with a physical scale. The comparisons with data are in good agreement. As is expected, the results in the CORGI approach indicate a better agreement to the data than the NLO calculation in the standard approach.


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