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Physical Review D

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Gap domain wall fermions

Pavlos M. Vranas^*

IBM T. J. Watson Research Center, Yorktown Heights, New York 10598, USA

^*Electronic address: vranasp@us.ibm.com

Phys. Rev. D 74, 034512 – Published 23 August, 2006

DOI: https://doi.org/10.1103/PhysRevD.74.034512

Abstract

I demonstrate that the chiral properties of domain wall fermions (DWF) in the large to intermediate lattice spacing regime of QCD, 1 to 2 GeV, are significantly improved by adding to the action two standard Wilson fermions with supercritical mass equal to the negative DWF five-dimensional mass. Using quenched DWF simulations I show that the eigenvalue spectrum of the transfer matrix Hamiltonian develops a substantial gap and that the residual mass decreases appreciatively. Furthermore, I confirm that local topology changing remains active and that the hadron spectrum of the added Wilson fermions is above the lattice cutoff and therefore is irrelevant. I argue that this result should also hold for dynamical DWF and furthermore that it should improve the chiral properties of related fermion methods.

Article Text

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