Lattice QCD with dynamical domain wall quarks

We study lattice QCD with two flavors of dynamical domain wall quarks. With renormalization group motivated actions, we find chiral symmetry can be preserved to a high degree at lattice cut off of a^{-1} \sim 2 GeV even for fifth dimension size as small as L_s = 12. In addition two new steps are introduced to improve the performance of the hybrid Monte Carlo simulation.