Interplay of nonrelativistic and relativistic effects in neutrino oscillations

Abstract

A theoretical structure that involves neutrino mass eigenstates at nonrelativistic as well as relativistic energies is presented. Using this framework, we find that if the particle [Formula presented], with a mass [Formula presented] MeV, of the KARMEN Collaboration anomaly is identified with the third neutrino mass eigenstate, then the present limit of [Formula presented] MeV upper bound on the [Formula presented] neutrino mass implies [Formula presented]. © 1997 The American Physical Society.