New data on the p + N → [Σ0K+] + N reaction at Ep= 70 GeV and the search for exotic baryons The SPHINX Collaboration (IHEP-ITEP)

被引：0

作者：

S.V. Golovkin

A.P. Kozhevnikov

V.P. Kubarovsky

V.F. Kurshetsov

L.G. Landsberg

V.V. Molchanov

V.A. Mukhin

S.V. Petrenko

V.A. Senko

D.V. Vavilov

V.A. Victorov

V.Z. Kolganov

G.S. Lomkatsi

A.F. Nilov

V.T. Smolyankin

机构：

[1] State Research Center,

[2] Institute for High Energy Physics,undefined

[3] Protvino,undefined

[4] Russia,undefined

[5] State Research Center,undefined

[6] Institute of Theoretical and Experimental Physics,undefined

[7] Moscow,undefined

[8] Russia,undefined

来源：

The European Physical Journal A - Hadrons and Nuclei | 1999年 / 5卷

关键词：

PACS:13.85.Fb Inelastic scattering: two particle find state – 25.40.Ve Other reactions above meson production thresholds (energies >400 MeV);

D O I：

暂无

中图分类号：

学科分类号：

摘要：

New data for the diffractive reaction p+N→ [Σ0K+] +N at Ep= 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(Σ0K+) 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 P2T < 0.01 GeV2. The possibility of the Coulomb production mechanism for X(1810) is discussed.

引用

页码：409 / 416

页数：7