Article ID Journal Published Year Pages File Type
8183412 Nuclear Physics A 2013 5 Pages PDF
Abstract
A Bayesian analysis of the worldʼs p(γ,K+)Λ data is presented. We adopt a Regge-plus-resonance framework featuring consistent interactions for nucleon resonances up to spin J=5/2. The power of the momentum dependence of the consistent interaction structure rises with the spin of the resonance. This leads to unphysical structures in the energy dependence of the computed cross sections when the short-distance physics is cut off with standard hadronic form factors. A plausible, spin-dependent modification of the hadronic form factor is proposed which suppresses the unphysical artifacts. Next, we evaluate all possible combinations of 11 candidate resonances. The best model is selected from the 2048 model variants by calculating the Bayesian evidence values against the worldʼs p(γ,K+)Λ data. From the proposed selection of 11 resonances, we find that the following nucleon resonances have the highest probability of contributing to the reaction: S11(1535), S11(1650), F15(1680), P13(1720), D13(1900), P13(1900), P11(1900), and F15(2000).
Related Topics
Physical Sciences and Engineering Physics and Astronomy Nuclear and High Energy Physics
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