VACUUM STRUCTURE IN QCD WITH QUARK AND GLUON CONDENSATES

Abstract

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 operators. We then find that a constrained energy minimization of the Hamiltonian leads to a QCD vacuum with both quark and gluon condensates for αs>αc=0.62. The pion decay constant and the charge radius of the pion seem to fix the QCD coupling constant αs as 1.28, with the bag pressure given by [Formula: see text] This approach to QCD opens up possibilities of relating the mysterious vacuum structure with common place hadronic properties in a more direct manner.