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Freiburg 1999 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 7: Elektromagnetische und hadronische Proben I

HK 7.3: Talk

Monday, March 22, 1999, 14:30–14:45, E

Analysis of the reaction ppppη near the threshold. — •Vadim Baru1,2, Johann Haidenbauer1, Christoph Hanhart1, Aleksander Kudryavtsev2,1, and Josef Speth11Institut f"ur Kernphysik des Forschungszentrum J"ulich GmbH, 52425 Jülich — 2Institute of Theoretical and Experimental Physics, 117258, B.Cheremushkinskaya 25, Moscow,Russia

For essentially all the meson production reactions measured in the past few years (e.g.π, K) the energy dependence of the production cross section near threshold can be understood in terms of the strong Baryon-Baryon final state interaction only [1]. Recent data for the reaction ppppη taken at COSY-11 [2] show, however, a drastic deviation from this feature. Various theoretical implications of this deviation are discussed. Special emphasis is put on the possible existence of a resonance in the ηp-system.

[1.] K.M.Watson, Phys. Rev., 88, 1163 (1952)

[2.] P.Moskal et al., Phys. Rev. Lett, 80, 3202 (1998)

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