Calculation of the axial-vector coupling constant gA to two loops in covariant chiral perturbation theory
Abstract
We present a calculation of the leading two-loop corrections to the axial-vector coupling constant gA in two covariant versions of two-flavor baryon chiral perturbation theory. Taking the low-energy constants from a combined analysis of elastic and inelastic pion-nucleon scattering, we find that these corrections are rather moderate.
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