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

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

2007-11-20

arxiv.org/abs/0711.3063v2

Chin.Phys.Lett.25:888-891,2008

Physics

Nuclear Physics

Nuclear Theory

10pp + 4figs, published version

Scientific paper

10.1088/0256-307X/25/3/023

We explore production mechanism and final state interaction in the $pp \to nK^ + \Sigma ^ +$ channel based on the inconsistent experimental data published respectively by COSY-11 and COSY-ANKE. The scattering parameter $a> 0$ for $n\Sigma ^ +$ interaction is favored by large near-threshold cross section within a nonrelativistic parametrization investigation, and a strong $n\Sigma ^ +$ interaction comparable to $pp$ interaction is also indicated. Based on this analysis we calculate the contribution from resonance $\Delta ^* (1920)$ through $\pi ^ +$ 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 $\Delta ^*(1620)$, the model gives a much better description to the rather large near-threshold total cross section published by COSY-11.

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