Kaon photoproduction in a multipole approach

Abstract

The recently published experimental data on K+Lambda photoproduction by the SAPHIR, CLAS, and LEPS collaborations are analyzed by means of a multipole approach. For this purpose the background amplitudes are constructed from appropriate Feynman diagrams in a gauge-invariant and crossing-symmetric fashion. The results of our calculation emphasize the lack of mutual consistency between the SAPHIR and CLAS data previously found by several independent research groups, whereas the LEPS data are found to be more consistent with those of CLAS. The use of SAPHIR and CLAS data, individually or simultaneously, leads to quite different resonance parameters which, therefore, could lead to different conclusions on ``missing resonances''. Fitting to the SAPHIR and LEPS data simultaneously indicates that the S_{11}(1650), P_{13}(1720), D_{13}(1700), D_{13}(2080), F_{15}(1680), and F_{15}(2000) resonances are required, while fitting to the combination of CLAS and LEPS data leads alternatively to the P_{13}(1900), D_{13}(2080), D_{15}(1675), F_{15}(1680), and F_{17}(1990) resonances. Although yielding different results in most cases, both SAPHIR and CLAS data indicate that the second peak in the cross sections at W = 1900 MeV originates from the D_{13}(2080) resonance with a mass between 1911 - 1936 MeV. Furthermore, in contrast to the results of currently available models and the Table of Particle Properties, both data sets do not exhibit the need for a P_{11}(1710) resonance. The few data points available for target asymmetry can not be described by the models proposed in the present work.

33 pages, 14 figures

References in corpus (1)

• Kaon Photoproduction in the Feynman and Regge Theories

Cited by in corpus (15)

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• Analysis of the consistency of kaon photoproduction data with Lambda in the final state
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• Separated Structure Functions for Exclusive $K^{+}\Lambda$ and $K^{+}{\Sigma }^0$ Electroproduction at 5.5 GeV with CLAS
• Evidence for the J^p=1/2^+ narrow state at 1650 MeV in the photoproduction of KLambda
• Photo- and Electroproduction of the Hypertriton on 3He
• Energy-independent PWA of the reaction $\gamma p\to K^{+}\Lambda$
• Gerasimov-Drell-Hearn Sum Rule and the Discrepancy between the New CLAS and SAPHIR Data
• Kaon photoproduction on the nucleon with constrained parameters
• Irreducible tensor approach to spin observables in photo production of mesons with arbitrary spin-parity $s^{\pi }$
• From Pauli Principle to Hypernucleus, Neutron Star, and Econophysics