Reinvestigation of \(pp\to pp\pi^0\) and \(pp\to pp\eta\) at threshold

\(pp\to pp\pi^0\) and \(pp\to pp\eta\) were considered close to threshold. The pion production was found not only to be dominated by impulse approximation (IA) and rescattering contributions, but also strongly by box-diagrams, resonances and heavy-meson exchanges. New relevant contributions for the...

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Bibliographic Details
Published in:arXiv.org 1998-08
Main Authors: Kleefeld, Frieder, Dillig, Manfred
Format: Article
Language:English
Subjects:
Couplings
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Summary:\(pp\to pp\pi^0\) and \(pp\to pp\eta\) were considered close to threshold. The pion production was found not only to be dominated by impulse approximation (IA) and rescattering contributions, but also strongly by box-diagrams, resonances and heavy-meson exchanges. New relevant contributions for the IA were found. The role of the offshell behaviour of nucleon-resonance couplings (\(P_{11}(1440), S_{11}(1535)\)) and of interference effects for the eta production was investigated. The results opened a large door for microsopic understanding of short range physics. A covariant model for \(pp\to pp\eta\) being under construction is going to be finished.
ISSN:2331-8422