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IHEP 96 - 36
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| V.A.Bezzubov, S.V.Golovkin, A.G.Kholodenko, A.P.Kozhevnikov, V.P.Kubarovsky, A.I.Kulyavtzev, V.F.Kurshetsov, L.G.Landsberg, M.Yu.Matveev, V.V.Molchanov, V.A.Mukhin, V.I.Solyanik, D.V.Vavilov, V.A.Victorov ( IHEP, Protvino, Russia) G.K.Kliger, V.Z.Kolganov, G.S.Lomkatzi, A.F.Nilov, V.T.Smolyankin ( ITEP, Moscow, Russia) | ||
| New data on the reaction p+N\to[Sigma0K+]+N at Ep=70GeV | ||
| Protvino, 1996.- p.12, figs. 10, refs.:24. | ||
New data for the coherent diffractive reaction $p+C \to [\Sigma^0K^+]+C$ at $E_p=70\,{\rm GeV}$ have been obtained with the modernized SPHINX setup. These data are in a good agreement with our previous results for the reaction under study. In the summed up mass spectrum $M(\Sigma^0K^+)$ some structure in the threshold region with mass $\sim 1810\,{\rm MeV}$ and strong $X(2000)$ peak with $M=1996\pm7\,{\rm MeV}$ and $\Gamma=99\pm21\,{\rm MeV}$ are clearly seen. The unusual features of the massive $X(2000)$ state (small enough decay width, anomalously large branching ratios for decay channels with strange particles emission) make it a very serious candidate for cryptoexotic pentaquark baryon with hidden strangeness $\ket{qqqs\bar s}$. We also present new information about a narrow threshold structure with $M\sim 1810\,{\rm MeV}$ and new data for $M(\Sigma^0K^+)$ and $M(p\eta)$ spectra in the reactions $p+N \to [\Sigma^0K^+]+N$ and $p+N \to [p\eta]+N$ in nonperipheral region with $\PtSq >0.3\,{\rm GeV}^2$.
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