Crossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process

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dc.creatorFernandez-Ramirez, C.
dc.creatorde Guerra, E. Moya
dc.creatorUdias, J. M.
dc.date2008-01-18
dc.date.accessioned2026-07-07T11:14:06Z
dc.date.available2026-07-07T11:14:06Z
dc.descriptionWe investigate the importance of crossing symmetry in effective field models and the effects of phenomenological nucleon resonance widths on the paradigmatic case of pion photoproduction. We use reaction models containing four star resonances up to 1.8 Gev ($Δ$(1232), N(1440), N(1520), N(1535), $Δ$(1620), N(1650), $Δ$(1700), and N(1720)) with different prescriptions for crossed terms and widths, to fit the latest world database on pion photoproduction. We compare $χ^2$ results from selected multipoles and fits. The $χ^2$ is highly dependent on the fulfillment of crossing symmetry and the inclusion of $u$ channels.
dc.description11 pages, 3 figures, 1 table, to be published in Physics Letters B
dc.identifierhttps://arxiv.org/abs/0801.2983
dc.identifierhttp://arxiv.org/abs/0801.2983
dc.identifierPhys.Lett.B660:188-192,2008
dc.identifierdoi:10.1016/j.physletb.2007.11.099
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/191948
dc.subjectNuclear Theory
dc.titleCrossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process
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