On fragmentation function of quark-gluon system

A statistical approach to ''soft'' fragmentation of a quark-gluon system S into a hadron H is presented. Formulas are written for the fragmentation function of the process S → h. In particular, the quark-into-hadron fragmentation functions are determined. The predictions of the statistical approach under consideration are compared with the experimental data on the π+/π-(π-/π+) yield ratios in neutrino (antineutrino) deep inelastic scattering on a nucleon