\[sec:Results\]. There is one more comment in order here. The Sudakov resummation model is very sensitive to the region $k_{T}\lesssim1\,\mathrm{GeV}$ which is not well described by the practical implementations of the equations \[enu:pure-BFKL-equation\]-\[enu:lastmodel\] as they use certain low-$k_{T}$ cut, $k_{T\,0}$. For $k_{T}<k_{T\,0}$ the UGD is typically modelled or extrapolated by a constant value.

Let us now discuss the models for the initial condition $\mathcal{F}_{0}$. In this paper we have tested the following models (in the brackets we give the aliases used below to identify the model):

\[eq:param\]

1.  exponential model (EXP)\[enu:Models\_ini\] $$\mathcal{F}_{0}\left(x,k_{T}^{2}\right)=N\, e^{-Ak_{T}^{2}}\left(1-x\right)^{a}\left(1-Dx\right)\label{eq:Model_exp}$$

2.  (negative) power-like model with running $\alpha_{s}$ (POW) $$\mathcal{F}_{0}\left(x,k_{T}^{2}\right)=\frac{\overline{\alpha}_{s}\left(k_{T}^{2}\right)}{k_{T}^{2}}\, N
    \, x^A
    \left(1-x\right)^{a}\label{eq:Model_ask}
    (1-Dx)$$

3.  DGLAP-based model (Pgg)\[enu:Models\_fini\] $$\mathcal{F}_{0}\left(x,k_{T}^{2}\right)=\frac{\alpha_{s}\left(k_{T}^{2}\right)}{2\pi k_{T}^{2}}\,
    \int_{x}^{1}dz
    \, P_{gg}\left(z\right)\hat{\mathcal{G}}_{0}\left(x\right),\label{eq:Model_Pgg_1}$$ where $$\hat{\mathcal{G}}_{0}\left(x\right)=N
    \, x^A
    \left(1-x\right)^{a}\left(1-Dx\right)\label{eq:Model_Pgg_2}$$ is a model for an integrated gluon density.

The parameters $N$, $A$, $a$, $D$ are, in general, free parameters and need to be fitted.

We see that in principle there are quite a few variants to be fitted. Though not all of the combinations make sense, we are still left with several scenarios to be tested.

Fitting procedure {#sec:Procedure}
=================

We have used two data samples measured by CMS detector [@Chatrchyan2012] for inclusive forward-central dijet production at CM energy 