Effective Lagrangian Approach to pion photoproduction from the nucleon

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dc.creatorFernandez-Ramirez, C.
dc.creatorde Guerra, E. Moya
dc.creatorUdias, J. M.
dc.date2005-09-08
dc.date2006-03-29
dc.date.accessioned2026-07-07T06:43:18Z
dc.date.available2026-07-07T06:43:18Z
dc.descriptionWe 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.
dc.descriptionMisprints corrected. 60 pages. 33 figures.5 tables. Accepted for publication in Annals of Physics (NY)
dc.identifierhttps://arxiv.org/abs/nucl-th/0509020
dc.identifierhttp://arxiv.org/abs/nucl-th/0509020
dc.identifierAnnals Phys. 321 (2006) 1408-1456
dc.identifierdoi:10.1016/j.aop.2006.02.009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/102364
dc.subjectNuclear Theory
dc.titleEffective Lagrangian Approach to pion photoproduction from the nucleon
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