Gluonic correlation length from spin-dependent potentials
  The vacuum gluonic correlation length is extracted from recent lattice data on spin-dependent interquark potentials in heavy quarkonia. It is shown that the data are consistent with extremely small values of the correlation length, Tg<0.1 fm. 
A.M.Badalian, A.V.Nefediev, Yu.A.Simonov (ITEP, Moscow)