2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/192716Theoretical as well as experimental progress has been made in the last decade in describing the properties of baryons. In this review I will mostly report on the theoretical issues. Two non-perturbative methods are privileged frameworks for studying these properties in the low energy domain: chiral perturbation theory, the effective field theory of the Standard Model at energies below 1 GeV and lattice QCD. I will mainly concentrate here on the first one but I will also discuss the complementarity of the two methods. Chiral extrapolations for lattice simulations of some nucleon properties will be investigated. I will then concentrate on processes involving at most two nucleons, describing for example pion-nucleon and pion-deuteron scattering, pion photo- and electroproduction off the nucleon and the deuteron and doubly virtual Compton scattering. Three flavor calculations will also be reviewed.commissioned article for Prog. Nucl. Part. PhysHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentHigh Energy Physics - LatticeNuclear ExperimentNuclear Theorytext