Abstract
We discuss renormalization for a class of Lagrangians containing an explicit mass term for the vector field and a four-vertex for the Faddeev-Popov ghost field. The action is shown to be invariant under nonlinear gauge transformations, which are a generalization of those introduced by Becchi, Rouet and Stora. This invariance guarantees the validity of the Slavnov-Taylor identities, which are then used to discuss the renormalization of the theory. The problem of unitarity is not discussed here. Canonical and Lorentz-covariant formalism is employed.
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