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 pp→ ppη^′ near the threshold. — •Vadim Baru^1,2, Johann Haidenbauer¹, Christoph Hanhart¹, Aleksander Kudryavtsev^2,1, and Josef Speth¹ — ¹Institut 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 pp→ ppη^′ 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 η^′p-system.

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

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