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Propagator of the Lattice Domain Wall Fermion and the Staggered Fermion

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An Erratum to this article was published on 24 April 2009

An Erratum to this article was published on 24 April 2009

Abstract

We calculate the propagator of the domain wall fermion (DWF) of the RBC/UKQCD collaboration with 2 + 1 dynamical flavors of 163 × 32 × 16 lattice in Coulomb gauge, by applying the conjugate gradient method. We find that the fluctuation of the propagator is small when the momenta are taken along the diagonal of the 4-dimensional lattice. Restricting momenta in this momentum region, which is called the cylinder cut, we compare the mass function and the running coupling of the quark-gluon coupling α s,g1(q) with those of the staggered fermion of the MILC collaboration in Landau gauge. In the case of DWF, the ambiguity of the phase of the wave function is adjusted such that the overlap of the solution of the conjugate gradient method and the plane wave at the source becomes real. The quark-gluon coupling α s,g1(q) of the DWF in the region q > 1.3 GeV agrees with ghost-gluon coupling α s (q) that we measured by using the configuration of the MILC collaboration, i.e., enhancement by a factor (1 + c/q 2) with c ≃ 2.8 GeV2 on the pQCD result. In the case of staggered fermion, in contrast to the ghost-gluon coupling α s (q) in Landau gauge which showed infrared suppression, the quark-gluon coupling α s,g1(q) in the infrared region increases monotonically as q→ 0. Above 2 GeV, the quark-gluon coupling α s,g1(q) of staggered fermion calculated by naive crossing becomes smaller than that of DWF, probably due to the complex phase of the propagator which is not connected with the low energy physics of the fermion taste.

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  1. School of Science and Engineering, Teikyo University, 1-1 Toyosatodai, Utsunomiya, 320-8551, Japan

    Sadataka Furui

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Correspondence to Sadataka Furui.

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An erratum to this article can be found at http://dx.doi.org/10.1007/s00601-009-0053-4

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Furui, S. Propagator of the Lattice Domain Wall Fermion and the Staggered Fermion. Few-Body Syst 45, 51–63 (2009). https://doi.org/10.1007/s00601-009-0008-9

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