Optimal lattice domain-wall fermions with finite Ns

Abstract

I review the lattice formulations of vector-like gauge theories (e.g. QCD) with domain-wall fermions, and discuss how to optimize the chiral symmetry for any finite N_s (in the fifth dimension), as well as to eliminate its dependence on a_5.

Comments: 7 pages, Invited talk given at 2002 International Workshop on Strong Coupling Gauge Theories and Effective Field Theories (SCGT02), Nagoya, Japan, 10-13 Dec 2002