Reinvestigation of $pp\to ppπ^0$ and $pp\to ppη$ at threshold

Details Reinvestigation of $pp\to ppπ^0$ and $pp\to ppη$ at threshold Reinvestigation of $pp\to ppπ^0$ and $pp\to ppη$ at threshold

1998-06-18

arxiv.org/abs/nucl-th/9806057v2

Acta Phys.Polon. B29 (1998) 3059-3064

Physics

Nuclear Physics

Nuclear Theory

5 pages, 5 figures (corrected for spelling mistakes)

Scientific paper

$pp\to pp\pi^0$ 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.

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