  The set of kinetic equations describing the process of conversion of a beam
of protons into mesons and then to neutrinos is solved. The asymptotic
evolution of the density profile of neutrinos is essentially the same as that
obtained in the previous version of the note for a simple model of uniformly
damped wave-packet. It shows again that the recently reported "superluminal
neutrinos" could be considered as a purely statistical effect due to the fact
that the detected neutrinos represent a biased sample of initial protons.
