摘要
We explore production mechanism and final state interaction in the pp → nK^＋∑^＋ channel based on the inconsistent experimental data published respectively by COSY-11 and COSY-ANKE. The scattering parameter a 〉 0 for n∑^＋ interaction is favoured by large near-threshold cross section within a nonrelativistic parametrization investigation, rand 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 COSYANKE data. With an additional sub-threshold resonance △^＊（1620）, the model gives a much better description to the rather large near-threshold total cross section published by COSY-11.
We explore production mechanism and final state interaction in the pp → nK^＋∑^＋ channel based on the inconsistent experimental data published respectively by COSY-11 and COSY-ANKE. The scattering parameter a 〉 0 for n∑^＋ interaction is favoured by large near-threshold cross section within a nonrelativistic parametrization investigation, rand 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 COSYANKE data. With an additional sub-threshold resonance △^＊（1620）, the model gives a much better description to the rather large near-threshold total cross section published by COSY-11.
基金
Supported by the Knowledge Innovation Project of Chinese Academy of Sciences under Grant Nos KJCX3-SYW-N2 and KJCX2-SW-N16, and the National Natural Science Foundation of China under Grant Nos 10435080, 10575123, and 10710172.We would like to thank 3.3. Xie and B. S. Zou for fruitful discussions and program code. We also thank Colin Wilkin for a careful reading of the draft and valuable comments.
