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We apply a previously developed scheme to consistently include the improvedsaturation model for the unintegrated gluon distribution (UGD) in order toevaluate, in the framework of $k_{t}$ factorization, at small $x$ at thenext-to-leading order (NLO) in $\alpha_{s}$. We start the unintegrated gluondistribution with a parametrization of the deep inelastic structure functionfor electromagnetic scattering with protons, and then extract the color dipolecross section, which preserves its behavior success in a wide range of$k_{t}^{2}$ in comparisons with the UGD models (M. Hentschinski, A. Sabio Veraand C. Salas (HSS), I.P.Ivanov and N.N.Nikolaev (IN) and G. Watt, A.D. Martinand M.G. Ryskin (WMR)) . These results show that the geometric scaling holdsfor the improved saturation model in a wide kinematic region $rQ_{s}$, and arecomparable with the Golec-Biernat-W$\ddot{\mathrm{u}}$sthoff (GBW) model. Theunintegrated gluon distribution at low and high momentum transfer in a widerange of $x$ is considered.

The dipole cross section by the unintegrated gluon distribution at small $x$