Electroproduction of kaons from the proton in a Regge-plus-resonance approach

摘要

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. (C) 2007 Elsevier B.V. All rights reserved.