Yu-Chih Chen, Ting-Wai Chiu, for the TWQCD collaboration
We derive the axial Ward identity for lattice QCD with domain-wall fermions, and from which we obtain a formula for the residual mass, that can be used to measure the chiral symmetry breaking due to the finite extension Ns in the fifth dimension. Furthermore, we obtain an upper bound for the residual mass in lattice QCD with the optimal domain-wall fermion, which is an exponentially decreasing function of Ns, for any lattice size, at zero or finite temperatures.
View original:
http://arxiv.org/abs/1205.6151
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