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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.12: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Total cross section for η production in the quasi-free pnpnη reaction — •M. Janusz — Institute of Physics, Jagellonian University, Cracow, PL-30-059, Poland

The comparison of the total cross sections for the η and η meson production in the p-n and p-p collisions may be a proper tool in studying structure and production mechanism of both mesons.

The value of the total cross section for the reaction ppppη was found to be about 6.5 times smaller than that for the pnpnη rection [1] which is explained by a dominant isovector meson (π , ρ) exchange. The corresponding ratio for the η production will yield information of the underlying reaction mechanisms which are mediated by the η structure. A feasibility study of the quasi-free pnpnη reaction has been carried out at the COSY-11 facility at the cooler synchrotron COSY in Jülich using a proton beam scattered at a deuteron cluster target [2]. The data are still under evaluation but clearly demonstrate the possibility to reconstruct quasi-free pn reactions at COSY-11. Similar investigations for the production of the η meson have started. First measurements have been performed and a production run is scheduled for summer 2004 [3].

The detection capabilities of the quasi-free pnpnη (η) reaction at COSY-11 as well as preliminary results in the η channel will be presented.

[1] H. Calén et al., Phys. Rev. C 58 (1998) 2667.

[2] P. Moskal et al., nucl-ex/0311003.

[3] P. Moskal, COSY Proposal No.133.
Supported by Forschungszentrum Jülich.

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