Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-04-27
Phys.Lett.B656:186-192,2007
Physics
Nuclear Physics
Nuclear Theory
14 pages, 7 figures; added discussion on double counting in the RPR model; accepted for publication in Phys. Lett. B
Scientific paper
10.1016/j.physletb.2007.09.036
We present a Regge-plus-resonance (RPR) description of the p(e,e'K^+)Y processes (Y=\Lambda,\Sigma^0) in the resonance region. The background contributions to the RPR amplitude are constrained by the high-energy p(\gamma, K^+)Y data. As a result, the number of free model parameters in the resonance region is considerably reduced compared to typical effective-Lagrangian approaches. We compare a selection of RPR model variants, originally constructed to describe $KY$ photoproduction, with the world electroproduction database. The electromagnetic form factors of the intermediate N^*s and $\Delta^*s are computed in the Bonn constituent-quark model. With this input, we find a reasonable description of the p(e,e'K^+)Y data without adding or readjusting any parameters. It is demonstrated that the electroproduction response functions are extremely useful for fine-tuning both the background and resonant contributions to the reaction dynamics.
Cauteren Tim Van
Corthals T.
Craeyveld Van P.
Ireland David G.
Ryckebusch Jan
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