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

• Published in: Physics letters. B 2007-11, Vol.656 (4-5), p.186-192
• Main Authors: Corthals, T., Van Cauteren, T., Vancraeyveld, P., Ryckebusch, J., Ireland, D.G.
• Format: Article
• Language: English
• Subjects: [formula omitted] observables; Effective Lagrangians; Electromagnetic form factors; Exact sciences and technology; Light baryon spectrum; Nuclear physics; Physics; Regge phenomenology; The physics of elementary particles and fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2007.09.036

We present a Regge-plus-resonance (RPR) description of the p(e,e′K+)Y processes (Y=Λ,Σ0) in the resonance region. The background contributions to the RPR amplitude are constrained by the high-energy p(γ,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 Δ*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.