Nucleon axial charge from quenched lattice QCD with domain wall fermions and DBW2 gauge action

Details Nucleon axial charge from quenched lattice QCD with domain wall fermions and DBW2 gauge action Nucleon axial charge from quenched lattice QCD with domain wall fermions and DBW2 gauge action

2002-10-03

arxiv.org/abs/hep-lat/0210006v1

Physics

High Energy Physics

High Energy Physics - Lattice

For the RBC Collaboration, Lattice2002(matrixel)

Scientific paper

10.1016/S0920-5632(03)01563-9

The domain wall fermion (DWF) method, with its almost perfectly preserved chiral symmetry on the lattice, makes the calculation of the nucleon axial charge particularly easy. By maintaining chiral symmetry and using the Ward-Takahashi (WT) identity, one has Z_A = Z_V and the bare lattice calculation yields the physical value without explicit renormalization. The DBW2 improved gauge action provides further enhancement of the symmetry and hence a more accurate WT identity at coarse lattice spacing. Taking advantage of these methods, we confirmed a significant volume dependence of the nucleon axial charge on (1.2 fm)^3 and (2.4 fm)^3 lattice volumes.

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