Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/76515
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Type: Journal article
Title: Nucleon axial charge in (2+1)-flavor dynamical lattice QCD with domain-wall fermions
Author: Yamazaki, T.
Aoki, Y.
Blum, T.
Lin, H.
Lin, M.
Ohta, S.
Sasaki, S.
Tweedie, R.
Zanotti, J.
Citation: Physical Review Letters, 2008; 100(17):171602:1-171602:4
Publisher: American Physical Soc
Issue Date: 2008
ISSN: 0031-9007
1079-7114
Statement of
Responsibility: 
T. Yamazaki, Y. Aoki, T. Blum, H.W. Lin, M. F. Lin, S. Ohta, S. Sasaki, R. J. Tweedie, and J. M. Zanotti (RBC+UKQCD Collaborations)
Abstract: We present results for the nucleon axial charge g(sub)A 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 m(sub)π is 7360 units, including 900 for thermalization. We find finite volume effects are larger than the pion mass dependence at m(sub)π=330 MeV. We also find a scaling with the single variable m(sub)πL 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 g(sub)A=1.20(6)(4) at the physical pion mass, m(sub)π=135 MeV, 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≥(2.4 fm)³. We argue this is a dynamical quark effect.
Keywords: RBC+UKQCD Collaborations
Rights: © 2008 The American Physical Society
RMID: 0020120167
DOI: 10.1103/PhysRevLett.100.171602
Appears in Collections:Chemistry and Physics publications

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