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 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.

Comment: 5 pages, 5 figures (corrected for spelling mistakes)

Related Organizations

University of Erlangen-Nuremberg
Germany
Univerity of Erlangen-Nürnberg
Germany

Keywords

Nuclear Theory

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