Nucleon and Delta axial-vector couplings in 1/Nc - Baryon Chiral Perturbation Theory

Abstract

In this contribution, baryon axial-vector couplings are studied in the framework of the combined 1/Nc and chiral expansions. This framework is implemented on the basis of the emergent spin-flavor symmetry in baryons at large Nc and HBChPT, and linking both expansions (\xi-expansion), where 1/Nc is taken to be a quantity O(p). The study is carried out including one-loop contributions, which corresponds to O(\xi^3) for baryon masses and O(\xi^2) for the axial couplings. An analysis of the Lattice QCD results for the axial couplings of both N and \Delta is presented.