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IHEP 96 - 104
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| L.G.Landsberg | ||
| Search for Exotic Baryons in the Experiments on Proton Beam with Energy Ep=70 GeV GeV and Other Measurements with the SPHINX Facility | ||
| Protvino, 1996.- p.48,figs. 36, tables 3, refs.:72. | ||
In this review the results of the first stage of the experiments with the SPHINX facility are presented. In these experiments several diffractive production processes in a 70 GeV proton beam of the IHEP accelerator were studied. The evidence for new baryon states with masses $\geq$ 2 GeV is obtained in the hyperon-kaon effective mass spectra in the coherent reactions $p + C \rightarrow [\Sigma(1385)^0K^+] + C$ and $ p + C \rightarrow [\Sigma^0K^+] + C$. The unusual features of these massive states (small enough decay widths, large branching ratios for decays with strange particles in final states) make them serious candidates for cryptoexotic pentaquark baryons with hidden strangeness. Preliminary data for $p+N$ reactions in nonperiferal region with transverse momenta square $>0.3$ GeV$^2$ (the mass spectra $M(\Sigma^0 K^+)$, $M(p \eta)$ and $M(p \eta')$) are also presented in this review.
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