Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 27: Theorie

HK 27.2: Vortrag

Dienstag, 8. März 2005, 14:15–14:30, TU MA005

Coupled-channel analysis of the associated strangeness production in π N and γ N reactions in up to 2 GeV energy region — •Vitaliy Shklyar, Horst Lenske und Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, Germany

We study the (γ/π) N→ KΛ,Σ reactions in the energy region from the reaction threshold up to 2 GeV to investigate the role of the nucleon resonances in the associated strangeness production. The production mechanism is described within a coupled-channel effective Lagrangian approach developed in [1,2] where all rescattering effects in the π N, 2π N, η N, ω N, KΛ, and KΣ channels are simultaneously treated to describe the experimental data. To account for the resonance contributions to the reaction prosess we include all known nonstrange states [2] with spin-1/2,-3/2,and-5/2 and masses below 2 GeV. The role of the nucleon resonance contributions to the KΛ and KΣ final states is highlighted and obtained results are discussed. Work supported by FZ Jühlich.

[1] G. Penner and U. Mosel, Phys. Rev. 66, 055212 (2002).

[2] V. Shklyar, G. Penner, and U. Mosel, Eur. Phys. J. A21, 445,(2004).

[2] K. Hagiwara et al., Phys. Rev.D66, 010001,(2002).