A coupled-channel analysis of KΛ production in the nucleon resonance region
V. Shklyar, H. Lenske, U. Mosel
Abstract
A unitary coupled-channel effective Lagrangian model is applied to the combined analysis of the (π,γ) N KΛ reactions in the energy region up to 2 GeV. To constrain the resonance couplings to the KΛ final state the recent photoproduction data obtained by the SAPHIR, SPring-8, and CLAS groups are included into the calculations. The main resonance contributions to the process stem from the S11(1650), P13(1720), and P13(1900) states. The second bump at 1.9 GeV seen in the photoproduction cross section data is described as a coherent sum of the resonance and background contributions. The prediction for the beam polarization observable is presented.
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