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paper

The nucleon axial-vector coupling beyond one loop

arXiv:hep-lat/0605010 · doi:10.1016/j.physletb.2006.06.018

Abstract

We analyze the nucleon axial-vector coupling to two loops in chiral perturbation theory. We show that chiral extrapolations based on this representation require lattice data with pion masses below 300 MeV.

9 pp, 2 figs