Acquaintance with online and offline software at the NA61/SHINE experiment on the example of studying long-range correlations.

This report is devoted to preparation to study the onset of long-range correlations between observables measured in separated rapidity windows in experiment on fixed target (NA61)[1]. These correlations are considered on the basis of the quark-gluon strings model [2-3] which takes into account the possible string interactions at high energies nucleus-nucleus collisions [4-7]. The main reason why we study the long-range correlations to detect the effect of string fusion is the fact that the string is an extended object and gives during its fragmentation contribution to the wide range of rapidity. This allows us to expect the appearance of correlations between the values in the remote rapidity windows. In the experiment, the windows are selected in different hemispheres of emission of particles in the center of mass system: one in front, the other in the back.