THE CHIRAL EXTENSION OF LATTICE QCD

The chiral extension of Quantum Chromodynamics (XQCD) adds to the stan dard lattice action explicit pseudoscalar meson fields for the chiral condensates. With this action, it is feasible to do simulations at the chiral limit with zero mass Goldstone modes. We review the arguments for why this is expected to be in the same universality class as the t raditional action. We present preliminary results on convergence of XQ CD for naive fermions and on the methodology for introducing counter t erms to restore chiral symmetry for Wilson fermions.