Nucleon axial charge in (2+1)-flavor dynamical-lattice QCD with domain-wall fermions

T. Yamazaki, Y. Aoki, T. Blum, H. W. Lin, M. F. Lin, S. Ohta, S. Sasaki, R. J. Tweedie, J. M. Zanotti

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120 Citations (Scopus)

Abstract

We present results for the nucleon axial charge gA at a fixed lattice spacing of 1/a=1.73(3)GeV using 2+1 flavors of domain wall fermions on size 163×32 and 243×64 lattices (L=1.8 and 2.7 fm) with length 16 in the fifth dimension. The length of the Monte Carlo trajectory at the lightest mπ is 7360 units, including 900 for thermalization. We find finite volume effects are larger than the pion mass dependence at mπ=330MeV. We also find a scaling with the single variable mπL which can also be seen in previous two-flavor domain wall and Wilson fermion calculations. Using this scaling to eliminate the finite-volume effect, we obtain gA=1.20(6)(4) at the physical pion mass, mπ=135MeV, where the first and second errors are statistical and systematic. The observed finite-volume scaling also appears in similar quenched simulations, but disappear when V (2.4fm)3. We argue this is a dynamical quark effect.

Original languageEnglish
Article number171602
JournalPhysical review letters
Volume100
Issue number17
DOIs
Publication statusPublished - 2008 Apr 28
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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