Abstract
We discuss the value, in the light of recent «two-neutrino» experiments (1), of giving meaning to the neutrino charge or lepton number independent of helicity;i.e., of giving up the two-component neutrino theory and reverting to a single four-component neutrino whose left- and right-helicity states are coupled to e− and μ+, respectively. It is shown that, in fact,only by such experiments, involving muonsand electrons or their neutrinos, can a nontrivial meaning be given to lepton conservation. This Dirac neutrino theory is compared with the conventional theory of two two-component neutrinos from the conceptual and experimental points of view. Some remarks are made about the possibility of explaining the μ—e mass difference.
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