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

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