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Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Elektromagnetische und Hadronische Sonden

HK 35.3: Vortrag

Mittwoch, 14. März 2007, 17:30–17:45, A

Study of the near threshold η meson production in the deuteron-proton collision. — •Cezary Piskor-Ignatowicz, Pawel Moskal, and Jerzy Smyrski for the COSY-11 collaboration — Institute of Physics, Jagellonian University, 30-059 Cracow, Poland

The interaction of the η meson in the three nucleon system is intensively studied on theoretical grounds. This topic is of the special interest due to the possible existence of η-nucleus bound or quasi-bound states. Thus, near threshold experimental data on the production of the η meson in deuteron-proton collisions are of great importance. An improvement of the existing data base is also crucial for the understanding of the η meson production mechanism and the interaction of this meson with the nucleon. Measurements of excitation functions for the dp3 HeX and dpdpX, (X = π0,η) reactions [1] near the η production threshold have been conducted by the COSY-11 collaboration using a deuteron beam of the cooler synchrotron COSY and a hydrogen cluster target. For the 3 HeX channel the data were taken during a slow ramping of the COSY deuteron beam momentum and for the dpX channel at three discrete beam energies. The excitation function for the reaction dp3 Heπ0 does not show any structure which could originate from the decay of a 3 He−η bound state. In the excitation curve for the dp3 HeX process, however, contrary to the SATURNE results, we observe no cusp near the η threshold. The excitation functions for the dp3 Heπ0, dp3 Heη, and dpd p η reactions near threshold for the η meson production will be presented and discussed. [1] J. Smyrski et al., Acta Phys. Slovaca 56 213 (2006).

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