Backward pion-nucleon scattering |
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Authors: | F.?Huang A.?Sibirtsev J.?Haidenbauer S.?Krewald U.?-G.?Mei?ner |
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Affiliation: | 1.Department of Physics and Astronomy,The University of Georgia,Athens,USA;2.Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics,Universit?t Bonn,Bonn,Germany;3.Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility,Newport News,USA;4.Institut für Kernphysik and Jülich Center for Hadron Physics,Forschungszentrum Jülich,Jülich,Germany;5.Institute for Advanced Simulation,Forschungszentrum Jülich,Jülich,Germany |
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Abstract: | A global analysis of the world data on differential cross-sections and polarization asymmetries of backward pion-nucleon scattering for invariant collision energies above 3GeV is performed in a Regge model. Including the Naensuremath N_{alpha} , Ngensuremath N_{gamma} , Ddensuremath Delta_{delta} and Dbensuremath Delta_{beta} trajectories, we reproduce both angular distributions and polarization data for small values of the Mandelstam variable u , in contrast to previous analyses. The model amplitude is used to obtain evidence for baryon resonances with mass below 3GeV. Our analysis suggests a G39ensuremath G_{39} -resonance with a mass of 2.83GeV as member of the Dbensuremath Delta_{beta} -trajectory from the corresponding Chew-Frautschi plot. |
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