Fernández Ramírez, CésarMoya de Guerra, E.Udías, J. M.2024-12-092024-12-092006-06Fernández-Ramírez, Moya de Guerra, & Udías. (2006). Effective Lagrangian Approach to pion photoproduction from the nucleon. Annals of Physics, 321(6), 1408-1456. https://doi.org/10.1016/J.AOP.2006.02.0091096-035Xhttps://doi.org/10.1016/j.aop.2006.02.009https://hdl.handle.net/20.500.14468/24751This is an Accepted Manuscript of an article published by Elsevier in "Annals of Physics, 321(6), 1408-1456", available at: https://doi.org/10.1016/j.aop.2006.02.009Este es el manuscrito aceptado del artículo publicado por Elsevier en "Annals of Physics, 321(6), 1408-1456", disponible en línea: https://doi.org/10.1016/j.aop.2006.02.009We present a pion photoproduction model on the free nucleon based on an Effective Lagrangian Approach (ELA) which includes the nucleon resonances (Δ(1232), N(1440), N(1520), N(1535), Δ(1620), N(1650), and Δ(1700)), in addition to Born and vector meson exchange terms. The model incorporates a new theoretical treatment of spin-3/2 resonances, first introduced by Pascalutsa, avoiding pathologies present in previous models. Other main features of the model are chiral symmetry, gauge invariance, and crossing symmetry. We use the model combined with modern optimization techniques to assess the parameters of the nucleon resonances on the basis of world data on electromagnetic multipoles. We present results for electromagnetic multipoles, differential cross-sections, asymmetries, and total cross-sections for all one pion photoproduction processes on free nucleons. We find overall agreement with data from threshold up to 1 GeV in laboratory frame.eninfo:eu-repo/semantics/openAccessartículoPion photoproductionelectromagnetic multipolesnucleon resonancesspin-3/2