As an approach to theoretical understanding of neutral particles a new kind of field recently aug gested by Jauch, referred to as Jauch field below, is discussed in detail. Lagrangian and Hamiltonian formulation of Jauch field is obtained, which leads to the required anticommutators given by Jauch. The Jauch field, in appearance, shows the intermediate nature between Dirac and Majorana fields, but it is shown that contrary to Jauch's conclusion it can be a charged field with gauge invariant electromagnetic interaction. Gauge and Lorentz transformations of this field are examined, which again lead to quite contrary results to Jauch. Interaction terms are introduced and as an example the application to fl-decay neutrino is discussed.
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Kamefuchi et al. (1955) studied this question.