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Properties of nucleon resonances by means of a genetic algorithm

AutorFernández-Ramírez, César ; Moya de Guerra, Elvira ; Udías, A.; Udías, J. M.
Fecha de publicación24-jun-2008
EditorAmerican Physical Society
CitaciónPhysical Review C - Nuclear Physics 77: 065212 (2008)
ResumenWe present an optimization scheme that employs a genetic algorithm (GA) to determine the properties of low-lying nucleon excitations within a realistic photo-pion production model based upon an effective Lagrangian. We show that with this modern optimization technique it is possible to reliably assess the parameters of the resonances and the associated error bars as well as to identify weaknesses in the models. To illustrate the problems the optimization process may encounter, we provide results obtained for the nucleon resonances Δ(1230) and Δ(1700). The former can be easily isolated and thus has been studied in depth, while the latter is not as well known experimentally. © 2008 The American Physical Society.
Descripción11 págs.; 10 figs.; 3 tabs. ; PACS number(s): 14.20.Gk, 13.60.Le, 02.60.Pn, 02.70.−c
Versión del editorhttps://doi.org/10.1103/PhysRevC.77.065212
Identificadoresdoi: 10.1103/PhysRevC.77.065212
issn: 0556-2813
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