The reaction pp→ppη and the eta–nucleon and nucleon–nucleon interactions

✍ Scribed by M.T. Peña; H. Garcilazo; D.O. Riska

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 178 KB
• Volume: 683
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(00)00449-8

✦ Synopsis

The π, η and ρ exchange contributions to the cross section for the reaction pp → ppη near threshold are calculated, with a phenomenological description of the intermediate S11 (N( 1535)) resonance for all exchange mechanisms. The final state interaction in the pp system is described by realistic nucleon-nucleon interaction models. The sensitivity of the results to the phenomenological models for the η-nucleon transition amplitude and the nucleon-nucleon interaction is explored. The η-exchange mechanism is found to play a dominant role. The off-shell behavior of the ηN → ηN amplitude within the η exchange amplitude leads to a result significantly different from that obtained with the constant scattering length approximation. The two-nucleon amplitudes that are associated with the short-range components of the nucleon-nucleon interaction contribute significantly to the cross section.