  The correlations between multiplicities in two separated rapidity windows, is
studied in the framework of the Monte Carlo model based on the picture of
string formation in elementary collisions of colour dipoles. The hardness of
the elementary collisions is defined by a transverse size of the interacting
dipoles. The dependencies of the forward-backward correlation strength on the
width and position of the pseudorapidity windows, as well as on transverse
momentum range of observed particles were studied. It is demonstrated that
taking into account of the string fusion effects improves the agreement with
the available experimental data.
