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It is shown that in the leading twist approximation of the Wilson operator product expansion with “frozen” and analytic strong coupling constants, Bessel-inspired behavior of the structure functions F2 and F cc 2 and also the derivative ∂ ln F2/∂ ln(1/x) at small x values, obtained for a flat initial condition in the DGLAP evolution equations, lea ds to good agreement with the deep inelastic scattering experimental data from HERA.

Small x behavior of parton distributions. Analytical and «frozen» coupling constants. BFKL corrections