A NONLOCAL, COVARIANT GENERALIZATION OF THE NJL MODEL

We solve a nonlocal generalisation of the NJL model in the Hartree app roximation. This model has a separable interaction, as suggested by in stanton models of the QCD vacuum. The choice of form factor in this in teraction is motivated by the confining nature of the vacuum. A conser ved axial current is constructed in the chiral limit of the model and the pion properties are shown to satisfy the Gell-Mann-Oakes-Renner re lation. For reasonable values of the parameters the model exhibits qua rk confinement.