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Paper   IPM / Physic / 7830
School of Physics
  Title:   Determination of QCD Running Coupling Constant in NNLO Approximation, Using Complete RG Improvement
  Author(s): 
1.  A. Mirjalili
2.  Ali N. Khorramian
3.  S. Atashbar Tehrani
  Status:   Published
  Journal: Int. J. Mod. Phys. A
  No.:  8-9
  Vol.:  20
  Year:  2005
  Pages:   1955-1958
  Supported by:  IPM
  Abstract:
To obtain the improved QCD predictions for the moments of the xf3 structure function in νN scattering, three-loop Wilson coeffcients with the corresponding NNLO anoma- lous dimension coeffcients is used. A comparison between QCD predictions and the xf3 data of the CCFR collaboration has been done in which the Bernstein Polynomial method is used in the complete renormalization group improvement approach. A direct fits for ΛMS, over the corresponding range of Q2 with five effective quark flavours, is performed.

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