This Letter demonstrates that the nonrelativistic approximation breaks down for the lighter hadrons with the conventional qq one-gluon exchnage potential. This is mainly due to the Coulomb and the short-range hyperfine interactions. To overcome this difficulty, some phenomenological interactions with a long-range spin dependence are proposed. The validity of treating the spin-dependent term as a perturbation is examined.
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Bhaduri et al. (1980) studied this question.
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