“School of Particles”
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| Paper IPM / Particles / 11295 |
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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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