  The effects of string fusion on the correlations in strange particles
production in proton-proton collisions at high energy are studied in the
framework of a Monte Carlo string-parton model. The model is based on the
strings formation in elementary dipole-dipole collisions. The hardness of the
elementary interaction is defined by a transverse size of the colliding
dipoles. The interaction between strings is realized in the accordance with the
string fusion model prescriptions by the introduction of the lattice in the
impact parameter plane and taking into account the finite rapidity length of
strings. The particles species differentiation is implemented according to
Schwinger mechanism. The parameters of the model are fixed with the
experimental data on total inelastic cross section and charged multiplicity. In
the framework of the model the long-range correlation functions with an
accounting of strangeness have been studied. A new intensive event-by-event
observable has been proposed, which characterizes the fraction of strange
particles in the event. The predictions on the correlations between
strangeness, multiplicity and mean transverse momentum are obtained for pp
collisions at 7 TeV.
