Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-11-08
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages, 9 figures, Proc. LEAP/EXA-08 conferences,September 15-19, Wien
Scientific paper
Strange multi-baryonic clusters are an exiting possibility to explore the properties of cold dense baryonic matter. Recent results on searches for exotic narrow resonances with $\Lambda$ hyperon subsystems are reviewed. The observation of $\Sigma^0$, $\Sigma^{*+}$(1385) and $K^{*\pm}$(892) well known resonances from PDG are a good tests of this method. The mean value of mass for $\Sigma^{*-}(1385)$ resonance is shifted till mass of 1370 MeV/$c^2$ and width is two times larger than same value from PDG. Such of behavior for width and mass of $\Sigma^{*-}(1385)$ resonance interpreted as extensive contribution from stopping $\Xi^-\to\Lambda\pi^-$ and medium effect with mass of $\Sigma^{*-}(1385)$ resonance.In ($\Lambda\pi^+ \pi^-$) spectrum there are observed enhancement signals from $\Lambda ^*(1600)$, $\Lambda ^*(1750)$ and $\Lambda ^*(1850)$ resonances. A number of significant signals were found in the effective mass spectra of: 1)$\Lambda \gamma$,$p \gamma$ $\Lambda \pi^{\pm}$,$\Lambda \pi \pi$, $\Lambda p$ and $\Lambda p p$ subsystems.
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