Semi-inclusive distributions in statistical models

The semi-inclusive properties of the system of neutral and charged particles with net charge equal to zero are considered in the grand canonical, canonical and microcanonical ensembles as well as in a microcanonical ensemble with scaling volume fluctuations. Distributions of neutral-particle multiplicity and charged-particle momentum are calculated as a function of the number of charged particles. Different statistical ensembles lead to qualitatively different dependencies. They are being compared with the corresponding experimental data on multihadron production in p+p interactions at high energies.