Investigation of the diffractive reaction p+N→[Σ+K0]+N at the proton energy of Ep=70 GeV and observation of the decay process X(2000)→Σ+K0

被引：4
|
作者：
Vavilov, DV [1 ]
Viktorov, VA
Golovkin, SV
Kozhevnikov, AP
Kolganov, VZ
Kubarovsky, VP
Kurshetsov, VF
Landsberg, LG
Lomkatsi, GS
Molchanov, VV
Mukhin, VA
Nilov, AF
Petrenko, SV
Smolyankin, VT
机构：
[1] Protvino High Energy Phys Inst, Protvino 142284, Moscow Oblast, Russia
[2] Inst Theoret & Expt Phys, Moscow 117259, Russia
来源：
PHYSICS OF ATOMIC NUCLEI | 2000年 / 63卷 / 08期
关键词：
D O I：
10.1134/1.1307462
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
The diffractive reaction p + N --> [Sigma(+)K(0)] + N induced by 70-GeV protons is investigated at the SPHINX facility. The measured mass spectrum of the Sigma(+)K(0) system originating from this reaction shows a resonance structure with a mass of M = 1995 +/- 18 MeV and a width of Gamma = 90+/-32 MeV. The cross section for the formation of this structure is found to be sigma = 182 +/- 38 nb per target nucleon. These data comply well with the results that we obtained previously in studying the reaction p + N --> [Sigma(0)K(+)] + N, where we observed the formation of the X(2000) --> Sigma(0)K(+) state, a candidate for an exotic baryon with hidden strangeness. The measured ratio R of the two branching fractions, R = Br[X(2000) --> Sigma(+)K(0)]/Br[X(2000) --> Sigma(0)K(+)] = 1.91 +/- 0.38, is conisistent with the value of R = 2 expected for an isospin-1/2 baryon. (C) 2000 MAIK "Nauka/Interperiodica".
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页码：1391 / 1394
页数：4
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