Abstract
A combined analysis of the reactions and is carried out with a chiral quark model. The data in the center-of-mass (c.m.) energy range from threshold up to GeV are reasonably described. For , it is found that and play crucial roles near threshold. The resonance contributes to the reaction through configuration mixing with . The constructive interference between and is responsible for the peak structure around threshold in the total cross section. The -pole, -, and -channel backgrounds provide significant contributions to the reaction as well. For the process, the “first peak” in the total cross section is dominated by , which has a sizeable destructive interference with . Around ( GeV), there seems to be a small bump structure in the total cross section, which might be explained by the interference between the channel and . The resonance affects the angle distributions of the cross sections notably, although no obvious effects are seen in the total cross section. The role of -wave state should be further confirmed by future experiments. If has a narrow width of MeV as found in our previous work by a study of the photoproduction processes, obvious evidence should be seen in the and processes as well. Finally, we give our predictions of the -channel isospin- resonance contributions to the reactions.
2 More- Received 16 February 2016
- Revised 4 July 2016
DOI:https://doi.org/10.1103/PhysRevC.94.035202
©2016 American Physical Society