ON UNDERSTANDING QCD CONDENSATES FROM HADRON SPECTROSCOPY

We investigate in a specific and systematic manner the possibility of understanding some of the principal QCD condensates [(q) over bar Oq], which are traditionally associated with QCD sum rules, directly in te rms of their definition, viz., - integral d(4)pTr{(S) over tilde(F)(A) (p)O} where the quark propagator (S) over tilde(F)(A)(p) is so defined that the perturbative part is suitably subtracted. To this end, we re late the mass function m(p(2)) to the pion-quark vertex function in th e chiral limit. This last aspect provides a concrete handle for its de termination through the vehicle of the Bethe-Salpeter equation (BSE) f or q (q) over bar hadrons. Since the latter is directly adaptable to s pectroscopic studies, the method provides a clear linkage between the high-energy and low-energy descriptions of hadrons in QCD. The gluon c ondensate which is related to the same q (q) over bar interaction in t he confining region (the infrared domain of the gluon propagator) may also be calculated in a similar fashion. The results for most condensa tes are in good overlap with the values employed in the method of QCD sum rules.