arXiv:hep-lat/0605010·v1·High Energy Physics — Lattice
The nucleon axial-vector coupling beyond one loop
Véronique Bernard🇫🇷 · Ulf-G. Meißner🇩🇪
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.
Comments: 9 pp, 2 figs