are described in Section \[sec:Procedure\]. We give the results in Section \[sec:Results\]. Having the fits, we test them against recent forward-central dijet decorrelations data in Section \[sec:decorrelations\]. Finally, we discuss our research in Section \[sec:Summary\].

High Energy Factorization {#sec:HEF}
=========================

In this introductory section we discuss in more detail issues concerning factorization at small $x$. This task is somewhat complicated, notably because of the various existing approaches and various existing definitions of UGDs.

In the following paper the notion of HEF corresponds to a general class of factorization approaches supposed to be valid at small $x$. Below we list some of the existing realizations:

1.  the factorization of Gribov, Levin and Ryskin (GLR) [@Gribov1983] for high-$p_{T}$ inclusive gluon production \[HEFGLR\]

2.  the factorization of Catani, Ciafaloni and Hautmann (CCH) [@Catani:1990eg; @Catani:1994sq] for heavy quark production in DIS, photo-production and hadron-hadron collisions \[HEFCCH\]

3.  the factorization of Collins and Ellis [@Collins1991] for heavy quark production in hadron-hadron collisions \[HEFCE\]

4.  the factorization for inclusive gluon production in the saturation regime for proton-nuclei collisions within the Color Glass Condensate (CGC) approach [@Blaizot:2004wu] and color dipole formalism [@Kovchegov:2001sc; @Nikolaev:2004cu] (the equivalence of both approaches was shown in [@Iancu2004]) \[HEFCGC\]

In these approaches the 