Reinvestigation of p p ---> p p pi0 and p p ---> p p eta at threshold

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.

Note:

5 pages, 5 figures (corrected for spelling mistakes) Report-no: FAU-TP3-98/9

talk: Cracow 1998/05/30
p p: inelastic scattering
pi0: hadroproduction
eta: hadroproduction
threshold
impulse approximation
final-state interaction
Feynman graph: higher-order
nucleon resonance: effect
meson: exchange

References(3)

Figures(0)

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(
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- UCLA
)
,
K. Holinde
(
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)
,
C. Elster
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)

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•
DOI:
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Threshold production cross-section of the p p ---> p p eta reaction in a nonrelativistic OBE model

A. Moalem
(
- Ben Gurion U. of Negev
)
,
E. Gedalin
(
- Ben Gurion U. of Negev
)
,
L. Razdolskaya
(
- Ben Gurion U. of Negev
)
,
Z. Shorer
(
- Ben Gurion U. of Negev
)

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•
DOI:
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The N N ---> N N eta reaction close to threshold

A. Moalem
(
- Ben Gurion U. of Negev
)
,
E. Gedalin
(
- Ben Gurion U. of Negev
)
,
L. Razdolskaya
(
- Ben Gurion U. of Negev
)
,
Z. Shorer
(
- Ben Gurion U. of Negev
)

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•
DOI:
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