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| Journal Article | PreJuSER-59052 |
; ; ; ;
2007
Springer
Berlin
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Please use a persistent id in citations: http://hdl.handle.net/2128/10613 doi:10.1140/epja/i2006-10216-4
Abstract: We study the contribution of the Drell mechanism driven by K+ and K- exchange to the reaction gamma N K (K) over barN. Our calculation implements the full KN and KN reaction amplitudes in the form of partial- wave amplitudes taken from a meson-exchange model (KN) and a partial-wave analysis ((K) over barN), respectively. Comparing our results to data of the LAMP2 Collaboration we observe that the Drell mechanism alone cannot describe the large Lambda(1520) photoproduction rate observed experimentally. We argue that the discrepancy could be due to significant contributions from K* meson exchange with subsequent excitation of the Delta(1520)-resonance. After adding such contributions to our model a good agreement of the LAMP2 experiment is achieved. When applying the same model to the recent SAPHIR data we find an excellent description of the K+ p spectrum and find indications for a hyperon resonance with M (R) = 1617MeV and Gamma(R) = 117MeV in the K- p mass distribution.
Keyword(s): photon p: inelastic scattering ; K: photoproduction ; K: pair production ; Feynman graph ; K: exchange ; mass spectrum: (p K+) ; mass spectrum: (p K-) ; K- p: elastic scattering ; K- p: inelastic scattering ; partial wave analysis ; channel cross section: energy dependence ; angular distribution ; Lambda(1520): photoproduction ; numerical calculations ; interpretation of experiments: Bonn ELSA Stor ; bibliography ; photon p --> p K+ K- ; K- p --> n anti-K0 ; photon p --> Lambda(1520) K+
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