It is assumed that the results of relativistic quantum theories should be invariant under the
change in sign of the mass term in the Dirac Equation. The consequences of this principle …

The parity-non-conserving, VA form of Fermi interaction is derived from a principle of
invariance under a continuous group of transformations, in analogy with the ordinary gauge …

The fermion propagators in the quantum electrodynamics of the combined fields of electrons
and muons with zero bare masses have been investigated. The basic theory possesses …

In the Ihqs (mber~'pi (. turc the state of tt~ e se (, ond type is described by a sing'le ve (. tor
no~ malized to () n (* u I) to l~'hase, a, u~ it ray, in the Hilbert spa (: e. In the S (. h~ 6dinger l) …

Various authors have attempted to account for elementary particles, starting from a theory of
Fermi-type coupling between some Fermion fields. However, no quantum attempt has been …

The role of the gauge invariance is analysed. Such an invariance guarantees that the given
vector field (of electromagnetic or Yang-Mills kind) describes spin 1 only. Contrary to the …

=—6~ vpyvvPP~ and the tensor (sL'~ v sE p vppppp 5p~ devised by Calogero However, if
now some interaction is envisaged, the above considerations must be further ap-plied to …

It is known that there is a particular kind of projection operator, usually denoted by d (∂), in
terms of which the quantum theory of relativistic free fields can be put in a simple and …

A detailed analysis is made of the theoretical possibilities of constructing a quantum
mechanics and consequently of a description of the elementary particles, based on a …

Reflection Properties of Spin 1/2 Fields and a Universal Fermi-Type Interaction Page 1 PH
YSICAL REVI, E% VOLUME 79, NUMBER 3 AUGUST l, l 950 Re6ection Properties of Spin q …