Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-11-02
Proc. 8th Int. Conf. on the Structure of Baryons (Baryons '98), 22-26.9.1998, Bonn, Germany, p. 613-616 (Eds. D.W. Menze, B. M
Physics
Nuclear Physics
Nuclear Theory
4 pages; contribution to BARYONS98, Bonn, Germany, September 1998
Scientific paper
We present some details of our recent theoretical investigations on the total cross section of the reactions $pp\to pp \pi^0$, $pp\to pp \eta$ and $pp\to p\Lambda K^+$ at threshold. Applying standard nonrelativistic perturbation theory within the framework of meson exchange models (MEC) to all of the investigated processes we observe that theory is still far--off from a quantitative understanding of the existing data, although the qualitative behaviour of the threshold cross sections can be reproduced. The often quoted $\eta^2$--dependence of the $pp\to pp \pi^0$ cross section at threshold is due to a calculational mistake of Koltun and Reitan (1966) and not based on theoretical grounds, where threebody phasespace behaviour would yield $\eta^4$, which can be affected by final state and short range effects. To respect the high momentum transfers for $pp\to pp \eta$ and $pp\to p\Lambda K^+$ relativistic models were developed. Hereby the $\eta$--production still is based on MEC, while the $K^+$ production was investigated in the quark-gluon-picture based on the Bethe--Salpeter formalism.
Dillig Manfred
Kleefeld Frieder
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