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arXiv 0711.3063nucl-th
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共振模型中奇异性产生过程$pp \to nK^ + Σ^ +$

Strangeness Production Process $pp \to nK^ + Σ^ +$ within Resonance Model

Xu Cao, Xi-Guo Lee, Qing-Wu Wang

摘要:

基于COSY-11和COSY-ANKE发表的不一致的实验数据,我们探讨了$pp \to nK^ + Σ^ +$通道的产生机制和末态相互作用.在非相对论参数化研究中,$nΣ^ +$相互作用的散射参数$a> 0$被大的近阈值截面所支持,并且还表明了与$pp$相互作用相当的强$nΣ^ +$相互作用.在此基础上,计算了共振态$Δ^* (1920)$通过$π^ +$交换的贡献,计算结果表明,近阈值总截面很小,这与COSY-ANKE数据一致.通过引入亚阈值共振$Δ^*(1620)$,该模型对COSY-11公布的较大的近阈值总截面给出了更好的描述。

英文摘要:

We explore production mechanism and final state interaction in the $pp \to nK^ + Σ^ +$ channel based on the inconsistent experimental data published respectively by COSY-11 and COSY-ANKE. The scattering parameter $a> 0$ for $nΣ^ +$ interaction is favored by large near-threshold cross section within a nonrelativistic parametrization investigation, and a strong $nΣ^ +$ interaction comparable to $pp$ interaction is also indicated. Based on this analysis we calculate the contribution from resonance $Δ^* (1920)$ 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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