Abstract
A gauge-invariant formulation of massive non-Abelian vector bosons is discussed. It involves nonrenormalizable couplings in an unphysical sector. All the possibilities of decoupling this unphysical sector are discussed. They include the unitary gauge which is nonrenormalizable, due to propagator difficulties, and all the possible (Lagrangian and non-Lagrangian) non-Abelian generalizations of the Stueckelberg formalism which allow a continuous massless limit. None of them corresponds to a true gauge. On the basis of this presentation, there clearly exists no formulation of massive non-Abelian vector bosons renormalizable by power counting. It is however possible to find gauges where all the difficulties with renormalizability are confined in vertices involving always an unphysical field, so that it is plausible that the worst divergences cancel in the physical sector.
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