  In this work, we employ the effective vertices for interaction between
diquarks (scalar or axial-vector) and gluon where the form factors are derived
in terms of the B-S equation, to obtain the potential for baryons including a
light quark and a heavy diquark. The concerned phenomenological parameters are
obtained by fitting data of $B^{(*)}-$mesons instead of the heavy quarkonia.
The operator ordering problem in quantum mechanics is discussed. Our numerical
results indicate that the mass splitting between $B_{3/2}(V), B_{1/2}(V)$ and
$B_{1/2}(S)$ is very small and it is consistent with the heavy quark effective
theory (HQET).
