Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.10: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

The η N channel in the Jülich π N model — •Johann Haidenbauer¹, Achot M. Gasparyan², Christoph Hanhart¹, and Josef Speth¹ — ¹FZ Jülich, IKP, 52425 Jülich — ²ITEP, 117258, B.Cheremushkinskaya 25, Moscow, Russia

The reaction π N→ η N at the η N threshold is closely related to the properties of the S₁₁(1535) resonance. In the previous version of the Jülich π N model [1] the near-threshold π⁻p → η n cross section was overestimated by about 20-30% at the position of the peak. The reason for this deficiency is that only the π N and η N channels were allowed to couple to the N^*(1535) resonance.

Recently we presented an improved model of the π N interaction [2]. Specifically, we introduced now a coupling of the π Δ channel to the N^*(1535) resonance. This allowed a simultanous description of the total π⁻p → η n cross section and the inelasticity in the S₁₁ partial wave in the resonance region. We also achieved a much better description of the reaction π N→ η N at higher energies. We will report corresponding results at this meeting.

[1] O. Krehl et al., Phys. Rev. C 62, 025207 (2000).

[2] A.M. Gasparyan et al., Phys. Rev. C 68, 045207 (2003).