Abstract
We discuss a finite-$\ensuremath{\xi}$ formalism for the electromagnetic interaction of a massive charged vector meson with an arbitrary magnetic moment $\ensuremath{\kappa}$. The theory is Lorentz-covariant, renormalizable, and gauge-invariant. We consider the case $\ensuremath{\xi}=\ensuremath{\kappa}=1$ to show that the theory is unitary after introducing a fictitious particle and two new vertices in the theory.
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