Retardation terms in the one-gluon exchange potential

It is pointed out that the retardation terms given in the original Fermi-Breit potential vanish in the center-of-mass frame. The retarded one-gluon exchange potential is rederived in this paper from the three-dimensional one-gluon exchange kernel which appears in the exact three-dimensional relativistic equation for quark-antiquark bound states. The retardation part of the potential given in the approximation of order p(2)/m(2) is shown to be different from those derived in the previous literature. This part is off-shell and no longer vanishes in the center-of-mass frame.