dorsal/arxiv
View SchemaThe reactions $pp\to p\Lambda K^+$ and $pp\to p\Sigma^0K^+$ near their thresholds
| Authors | A. Gasparian, J. Haidenbauer, C. Hanhart, L. Kondratyuk, J. Speth |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9909017 |
| URL | https://arxiv.org/abs/nucl-th/9909017 |
| DOI | 10.1016/S0370-2693(00)00412-3 |
| Journal | Phys.Lett. B480 (2000) 273-279 |
Abstract
The reactions $pp\to p\Lambda K^+$ and $pp\to p\Sigma^0K^+$ are studied near their thresholds. The strangeness production process is described by the $\pi$- and $K$ exchange mechanisms. Effects from the final state interaction in the hyperon-nucleon system are taken into account rigorously. It is found that the $\Lambda$ production is dominated by $K$ exchange whereas $K$- as well as $\pi$ exchange play an important role for the $\Sigma^0$ case. It is shown that the experimentally observed strong suppression of $\Sigma^0$ production compared to $\Lambda$ production at the same excess energy can be explained by a destructive interference between $\pi$ and $K$ exchange in the reaction $pp\to p\Sigma^0K^+$. Implications of such an interference on the reaction $pp\to n\Sigma^+K^+$ are pointed out.
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"abstract": "The reactions $pp\\to p\\Lambda K^+$ and $pp\\to p\\Sigma^0K^+$ are studied near\ntheir thresholds. The strangeness production process is described by the $\\pi$-\nand $K$ exchange mechanisms. Effects from the final state interaction in the\nhyperon-nucleon system are taken into account rigorously. It is found that the\n$\\Lambda$ production is dominated by $K$ exchange whereas $K$- as well as $\\pi$\nexchange play an important role for the $\\Sigma^0$ case. It is shown that the\nexperimentally observed strong suppression of $\\Sigma^0$ production compared to\n$\\Lambda$ production at the same excess energy can be explained by a\ndestructive interference between $\\pi$ and $K$ exchange in the reaction $pp\\to\np\\Sigma^0K^+$. Implications of such an interference on the reaction $pp\\to\nn\\Sigma^+K^+$ are pointed out.",
"arxiv_id": "nucl-th/9909017",
"authors": [
"A. Gasparian",
"J. Haidenbauer",
"C. Hanhart",
"L. Kondratyuk",
"J. Speth"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0370-2693(00)00412-3",
"journal_ref": "Phys.Lett. B480 (2000) 273-279",
"title": "The reactions $pp\\to p\\Lambda K^+$ and $pp\\to p\\Sigma^0K^+$ near their thresholds",
"url": "https://arxiv.org/abs/nucl-th/9909017"
},
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