From Kondo Model and Strong Coupling Lattice QCD to the Isgur-Wise Function

Isgur-Wise functions parametrise the leading behaviour of weak decay form factors of mesons and baryons containing a single heavy quark. The form factors for the quark mass operator are calculated in strong coupling lattice QCD, and Isgur-Wise functions extracted from them. Based on renormalisation group invariance of the operators involved, it is argued that the Isgur-Wise functions would be the same in the weak coupling continuum theory. (Invited talk presented at the International Colloquium on Modern Quantum Field Theory II, TIFR, Bombay, January 5-11, 1994. To appear in proceedings.)