  A new formula for the heavy quark-antiquark spin dependent potential is given
by using the techniques developed in the heavy quark effective theory. The
leading logarithmic quark mass terms emerging from the loop contributions are
explicitly extracted and summed up. There is no renormalization scale ambiguity
in this new formula. The spin-dependent potential in the new formula is
expressed in terms of three independent color-electric and color-magnetic field
correlation functions, and it includes both the Eichten-Feinberg's formula and
the one-loop QCD result as special cases.
