The prevailing view that infinitely rising potentials which are used in the Dirac equation to confine quark-antiquark systems must not be Lorentz vectors is reexamined. By considering the infinite-mass limit of the Bethe-Salpeter equation, a relativistic single-particle equation which does allow vector confinement potentials to yield a discrete spectrum is obtained.
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Long et al. (1983) studied this question.
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