On a probabilistic interpretation of relativistic quantum mechanics

Quantum Action Principle that has been formulated earlier is used as a ground for a probabilistic interpretation of one-particle relativistic quantum mechanics. In the new approach the probability «flows» in the Minkowsky space being dependent on an inner time parameter, which we interprete as the particle life time. By means of an additional stationarity condition for the quantum action the life time is determined as a function of observable parameters of the real experiment.