Observation of A Narrow Baryon Resonance Decaying to Pk(S)(0) in Proton-Nucleus Interactions at 70 Gev/C with the Svd-2 Setup

A. N. Aleev,N. S. Amaglobeli,E. N. Ardashev,V. P. Balandin,S. G. Basiladze,S. F. Berezhnev,G. A. Bogdanova,I. V. Boguslavsky,M. V. Vasiliev,A. M. Vischnevskaya,V. Yu. Volkov,A. P. Vorobiev,A. G. Voronin,S. N. Golovnya,S. A. Golubkov,S. A. Gorokhov, A. V. Gorkov,I. M. Gramenitsky,N. I. Grishin,Ya. V. Grishkevich,N. N. Egorov,V. B. Ezhov,G. G. Ermakov,P. F. Ermolov,N. K. Zhidkov,L. L. Zakamsky,V. N. Zapolsky,E. G. Zverev,V. V. Zmushko,D. S. Zotkin,S. A. Zotkin,D. E. Karmanov,A. A. Kiryakov, V. V. Kozlov,Yu. F. Kozlov, E. S. Kokoulina,N. V. Korotkov,I. G. Kosarev,V. A. Kramarenko,A. V. Kubarovsky,E. N. Kuznetsov,N. A. Kuzmin,V. A. Kuzmin,L. L. Kurchaninov,G. I. Lanshikov,A. N. Larichev,M. S. Levitsky, A. K. Leflat,S. I. Lyutov,S. V. Maiorov,M. M. Merkin,A. A. Minaenko,G. Ya. Mitrofanov,A. M. Moiseev,V. S. Murzin,V. A. Nikitin,P. P. Nomokonov,A. A. Oleinik,S. V. Orfanitsky,V. V. Parakhin,V. S. Petrov,L. V. Pilavova,A. V. Pleskach,V. V. Popov,R. E. Rudenko,I. A. Rufanov,V. N. Riadovikov,V. A. Senko,A. I. Sidorov,M. M. Soldatov,L. A. Tikhonova,T. P. Topuria,N. F. Furmanec,A. G. Kholodenko,Yu. P. Tsyupa,N. A. Shalanda,M. D. Shafranov,A. I. Yukaev,V. I. Yakimchuk, The SVD Collaboration

Physics of atomic nuclei（2005）

引用 58|浏览16

暂无评分

摘要

Data from the SVD-2 experiment that were obtained at the IHEP accelerator in 70-GeV/c proton-nucleus interactions are analyzed with the aim of searches for an exotic Θ+ baryon that decays through the pK S 0 channel. The reaction pN → pK S 0 + X characterized by a bounded multiplicity of charged secondaries is used for this analysis. A resonance of mass M = 1526 ± 3(stat.) ± 3(syst.) MeV/c2 and width Γ < 24 MeV/c2 is observed in the invariant-mass spectrum of the pK S 0 system at a statistical significance of 5.6σ. The mass and the width of this resonance correspond to the recently found positive-strangeness Θ+ baryon, which was predicted to be an exotic baryon consisting of five quarks (pentaquark), \(uudd\bar s\). The total cross section for the production of a Θ+ baryon in pA interactions is estimated at a value within the range 30–120 μb for xF ≥ 0. An analysis of the A dependence of the cross section for Θ+-baryon production does not reveal a significant deviation from the A dependence for inelastic events (∼A0.7).

查看译文

关键词

Elementary Particle,Total Cross Section,Baryon Resonance,Inelastic Event,Baryon Production

AI 理解论文

溯源树

样例

生成溯源树，研究论文发展脉络

Chat Paper

正在生成论文摘要