2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/213851In the leading twist approximation of the Wilson operator product expansion with standard and "frozen" versions of strong copling constant we show that the Bessel-inspired behavior of the structure function $F_2$ at small $x$, obtained for a flat initial condition in the DGLAP evolution, leads to very good agreement with the deep inelastic scattering experimental data from HERA.6 pages, 2 figures, in Proc. of XIX International Baldin Seminar "Relativistic Nuclear Physics and Quantum Chromodynamics"High Energy Physics - Phenomenologytext