REMARKS ON THE WEAK STATES OF NEUTRINOS

It is shown that the weak states which are used in the standard treatm ent of neutrino oscillations do not, in general, describe correctly th e neutrinos produced and detected in weak-interaction processes. It is also shown that it is impossible to construct a Fock space of weak st ates. However, neutrino oscillations can be described by defining appr opriate "weak-process states," which are superpositions of mass eigens tates weighted by their transition amplitudes in the process under con sideration. In the extreme relativistic limit, the weak-process states reduce to the usual weak states. Some numerical examples are given to illustrate the magnitude of nonrelativistic corrections to the standa rd results.