The dependence of the number of pomerons on the impact parameter and the   long-range rapidity correlations in pp collisions
  The simple model which enables to take into account the effects of a colour string fusion in pp interactions is suggested. The parameters of the model are connected with the parameters of the pomeron trajectory and its couplings to hadrons. On the base of the model the MC algorithm which enables to calculate the long-range correlation functions between multiplicities and between the average transverse momentum and the multiplicity in pp collisions is developed. 
V. Vechernin, I. Lakomov
nucl-th hep-ph