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An Abelian gauge theory describing dynamics of massive spin one bosons isconstructed. This is achieved by appending to the Maxwell action, a gaugeinvariant mass term. The theory is quantised in temporal as well as Lorentzgauge, and the corresponding Hilbert spaces are constructed. In both thegauges, it is found that, the theory respects Lorentz invariance, locality,causality and unitarity.

A gauge theory of massive spin one particles