  The paper discusses the physical groundlessness of the models used for the
derivation of canonical distribution and provides the experimental data
demonstrating the incompleteness of quantum mechanics. The possibility of using
statistical ensembles is presented as a consequence of the existence of
probabilistic processes which are not accounted for by quantum mechanics. The
paper provides a new analytical derivation of canonical distribution for
macrosystems which takes into account subquantum processes. The paper discusses
the possibility of the experimental study of a probability which is beyond
quantum mechanics.
