NNLO ChPT with explicit Delta fits lattice data to extract g_A = 1.257 ± 0.011 and axial radius squared 0.312 ± 0.037 fm² at the physical point.
Siemens, Elastic pion-nucleon scattering in chiral perturbation theory: Explicit ∆(1232) degrees of freedom, (2020), arXiv:2001.03906 [nucl-th]
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Extraction of the nucleon axial form factor from Lattice QCD using NNLO chiral perturbation theory
NNLO ChPT with explicit Delta fits lattice data to extract g_A = 1.257 ± 0.011 and axial radius squared 0.312 ± 0.037 fm² at the physical point.