VACUUM-STRUCTURE IN QCD WITH QUARK AND GLUON CONDENSATES

We consider here the vacuum structure in QCD with both quark and gluon condensates and a variational ansatz for the ground state. The method is nonperturbative, using only equal time algebra for the field opera tors. We then find that a constrained energy minimization of the Hamil tonian leads to a QCD vacuum with both quark and gluon condensates for alpha(s) > alpha(c) = 0.62. The pion decay constant and the charge ra dius of the pion seem to fix the QCD coupling constant alpha(s) as 1.2 8, with the bag pressure given by B-g(1/4) similar or equal to 140 MeV . This approach to QCD opens up possibilities of relating the mysterio us vacuum structure with common place hadronic properties in a more di rect manner.