ISSN:
1434-601X
Keywords:
PACS:13.85.Fb Inelastic scattering: two particle find state – 25.40.Ve Other reactions above meson production thresholds (energies 〉400 MeV)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: New data for the diffractive reaction p+N→ [Σ0 K +] +N at E p= 70 GeV were obtained with partially upgraded SPHINX setup. The data are in a good agreement with the results of our previous study of this reaction. In the mass spectrum M(Σ0 K +) a structure at the threshold region with a mass ∼1810 MeV and a distinct X(2000) peak with M= 1989 ± 6 MeV and γ= 91 ± 20 MeV are observed. Unusual features of the massive X(2000) state (narrow decay width, anomalously large branching ratio for the decay channel with strange particle emission) make it a serious candidate for cryptoexotic pentaquark baryon with hidden strangeness |qqqs¯s〉. We also present new results on the narrow threshold structure X(1810) with M= 1807 ± 7 MeV and γ= 62 ± 19 MeV which is produced in the region of very small P 2 T 〈 0.01 GeV2. The possibility of the Coulomb production mechanism for X(1810) is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100500050304
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