The mixed quark-gluon condensate from an effective quark-quark interaction

Abstract

We exhibit the method for obtaining non perturbative quark and gluonic vacuum condensates from a model truncation of QCD. The truncation allows for a phenomenological description of the quark-quark interaction in a framework which maintains all global symmetries of QCD and allows an 1/N_c expansion. Within this approach the functional integration over the gluon fields can be performed and therefore any gluonic vacuum observable can be expressed in terms of a quark operator and the gluon propagator. As a special case we calculate the mixed quark gluon condensate. We investigate how the value depends on the form of the model quark-quark interaction. A comparison with the results of quenched lattice QCD, the instanton liquid model and QCD sum rules is drawn.

10 pages, no figures, LATEX using elsart.sty, minor corrections in some formulas, some references added, to be published in PLB

References in corpus (1)

• Hadron Physics from the Global Color Model of QCD

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