Neutral-vector fields theory with invariant gauge families

By a generalization of canonical quantum electrodynamics with invariant one-parameter gauge families, a wide theory of neutral vector fields is formulated in a unified way that describes massive and massless fields on the same basis. Similarly to the case of quantum electrodynamics, there exist two invariant gauge families in the sense that any two gauges belonging to the same family are connected with each other by a generalized q-number gauge transformation. It is shown that the theory is manifestly renormalizable and the unitarity of the S-matrix is guaranteed by conservation of currents. Renormalization problems in this formalism are investigated.