Nonperturbative definition of the pole mass and short distance expansion of the heavy quark potential in QCD

We show that the O(Λ) ambiguity in the pole mass can be fixed in a natural way by introducing a properly define nonperturbative V-scheme momentum space coupling αV (q) where the confining contributions have been subtracted out. It is found, relying on a result of Lüscher, that in quenched QCD αV (0)=0.196. The same coupling parametrizes the short distance power corrections to the heavy quark potential, and it is demonstrated in a transparent way that there indeed exists O(r) short distance power corrections to the potential of mixed origin, arising both from the standard linear confining term Kr (where K is the string tension), and from the leading renormalon in the momentum space potential.