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Strangeness Production Process pp→nK+ Σ^ within Resonance Model |
| CAO Xu1,3;LEE Xi-Guo1,2;WANG Qing-Wu 1,3 |
| 1Institute of Modern Physics, Chinese Academy of Sciences, PO Box 31, Lanzhou 7300002Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Collisions, Lanzhou 7300003Graduate School, Chinese Academy of Sciences, Beijing 100049 |
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| Cite this article: |
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CAO Xu, LEE Xi-Guo, WANG Qing-Wu 2008 Chin. Phys. Lett. 25 888-891 |
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Abstract We explore production mechanism and final state interaction in the pp→nK^+Σ+ channel based on the inconsistent experimental data published
respectively by COSY-11 and COSY-ANKE. The scattering parameter a>0 for nΣ+ interaction is favoured by large near-threshold cross section within a nonrelativistic parametrization investigation, and a strong n∑+ interaction comparable to pp interaction is also indicated. Based on this analysis we calculate the contribution from resonance ∆* (1920) through π+ exchange within resonance model, and the numerical result suggests a rather small near-threshold total cross section, which is consistent with the COSY-ANKE data. With an additional sub-threshold resonance Δ*(1620), the model gives a much better description to the rather large near-threshold total cross section published by COSY-11.
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| Keywords:
13.75.Cs
14.20.Gk
13.30.Eg
13.75.Ev
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Received: 20 December 2007
Published: 27 February 2008
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