Abstract
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 ⩾2 GeV is obtained in the hyperon-kaon effective mass spectra in the coherent reactions p+C→|Σ(1385)0K+|+C and p+C→|Σ0K+|+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 nonperipheral region with transverse momenta square >0.3 GeV2 (the mass spectra M(Σ0K+), M|pη| and M|pη′|) are also presented in this talk.
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