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Paper   IPM / Particles / 11295
School of Particles and Accelerator
  Title:   Nonsinglet parton distribution functions from the precise next-to-next-to-next-to leading order QCD fit
  Author(s): 
1 . Ali Naghi Khorramian
2 . Hamzeh Khanpour
3 . Shahin Atashbar Tehrani
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  81
  Year:  2010
  Pages:   014013(1)-014013(13)
  Supported by:  IPM
  Abstract:
We present the results of our QCD analysis for nonsinglet unpolarized quark distributions and structure function F2 �x;Q2� up to next-to-next-to-next-to leading order (N3LO). In this regards 4-loop anomalous dimension can be obtained from the Pade� approximations. The analysis is based on the Jacobi polynomials expansion of the structure function. New parameterizations are derived for the nonsinglet quark distributions for the kinematic wide range of x and Q2. Our calculations for nonsinglet unpolarized quark distribution functions up to N3LO are in good agreement with available theoretical models. The higher twist contributions of Fp;d 2 �x;Q2� are extracted in the large x region in N3LO analysis. The values of QCD and s �M2 z � are determined.

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