Vacuum condensates in the global color symmetry model - art. no. 055208

Based on the quark propagator in the instanton dilute liquid approximation, we have determined the quark condensate ((q) over bar q), the mixed quark gluon condensate g(s)((q) over bar G(mu nu)sigma(mu nu)q), and the four-qua rk condensate (q) over bar Gamma q (q) over bar Gamma q) at the mean-held l evel in the framework of the global color symmetry model. The numerical cal culation shows our results are compatible with the range obtained within ot her nonperturbative approaches. Moreover, we have calculated the lower dime nsional nonlocal quark condensates in this paper. [S0556-2813(99)00111-9].