Nonsinglet parton distribution functions from the precise next-to-next-to-next-to leading order QCD fit

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 F2p,d(x,Q2) are extracted in the large x region in N3LO analysis. The values of ΛQCD and αs(Mz2) are determined.