dorsal/arxiv
View SchemaProtoninduced Pion-, Eta- and Kaon-Production at Threshold
| Authors | F. Kleefeld, M. Dillig |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9811003 |
| URL | https://arxiv.org/abs/nucl-th/9811003 |
| Journal | 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. Metsch, ISBN 981-02-3865-7, (c) 1999 by World Scientific Publishing Co. Pte. Ltd.) |
Abstract
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.
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"abstract": "We present some details of our recent theoretical investigations on the total\ncross section of the reactions $pp\\to pp \\pi^0$, $pp\\to pp \\eta$ and $pp\\to\np\\Lambda K^+$ at threshold. Applying standard nonrelativistic perturbation\ntheory within the framework of meson exchange models (MEC) to all of the\ninvestigated processes we observe that theory is still far--off from a\nquantitative understanding of the existing data, although the qualitative\nbehaviour of the threshold cross sections can be reproduced. The often quoted\n$\\eta^2$--dependence of the $pp\\to pp \\pi^0$ cross section at threshold is due\nto a calculational mistake of Koltun and Reitan (1966) and not based on\ntheoretical grounds, where threebody phasespace behaviour would yield $\\eta^4$,\nwhich can be affected by final state and short range effects. To respect the\nhigh momentum transfers for $pp\\to pp \\eta$ and $pp\\to p\\Lambda K^+$\nrelativistic models were developed. Hereby the $\\eta$--production still is\nbased on MEC, while the $K^+$ production was investigated in the\nquark-gluon-picture based on the Bethe--Salpeter formalism.",
"arxiv_id": "nucl-th/9811003",
"authors": [
"F. Kleefeld",
"M. Dillig"
],
"categories": [
"nucl-th"
],
"journal_ref": "Proc. 8th Int. Conf. on the Structure of Baryons (Baryons \u002798),\n 22-26.9.1998, Bonn, Germany, p. 613-616 (Eds. D.W. Menze, B. Metsch, ISBN\n 981-02-3865-7, (c) 1999 by World Scientific Publishing Co. Pte. Ltd.)",
"title": "Protoninduced Pion-, Eta- and Kaon-Production at Threshold",
"url": "https://arxiv.org/abs/nucl-th/9811003"
},
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