Spin-orbit (→σ·→L) terms of the heavy-quark potential are calculated taking into account the effect of instantons in the dilute-gas approximation. It is shown that these terms can be expressed by means of differential operators acting on a certain potential ̃ \~V which is not related to the spin-independent potential of Callan et al. A rough estimate of the terms is also presented.
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C. A. A. de Carvalho (1979) studied this question.
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