Münster 2002 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 37: Theory V
HK 37.3: Talk
Thursday, March 14, 2002, 14:45–15:00, A
Strangeness photoproduction on the nucleon in the resonance region — •Stijn Janssen and Jan Ryckebusch — Proeftuinstraat 86, 9000 Gent, Belgium
A study of three strangeness photoproduction processes on the proton (γ p → K+ Λ, γ p → K+ Σ0 and γ p → K0 Σ+) within an effective Lagrangian formalism is presented [1,2]. By comparing model calculations to the SAPHIR data, we explore the contributions from different N* and Δ* resonances in the reaction mechanism. Special attention is paid to the issue of the “missing resonances”. Some of those missing nucleon states are expected to be revealed in these strange channels. In addition, we survey the sensitivity of the extracted resonance information to the uncertainties inherent to the treatment of the background contributions. We show that those background terms inevitably produce a dominant part of the reaction amplitude and compare predictions obtained with three plausible techniques of dealing with those terms. We conclude that model dependent effects can not be neglected in the analyses at this stage.
[1] S. Janssen, J. Ryckebusch, W. Van Nespen, D. Debruyne and T. Van Cauteren, Eur. Phys.J. A 11, 105 (2001)
[2] S. Janssen, J. Ryckebusch, D. Debruyne and T. Van Cauteren, Phys. Rev. C 65, 015201 (2001)