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题名: Some properties of the newly observed X(1835) state at BES
作者: He, Xiao-Gang ;  Li, Xue-Qian ;  Liu, Xiang ;  Ma, Jian-Ping
刊名: EUROPEAN PHYSICAL JOURNAL C
出版日期: 2007
卷号: 49, 期号:3, 页码:731-736
关键词: DECAYS ;  QCD ;  MASS ;  P(P)OVER-BAR ;  ENHANCEMENT ;  BARYONIUM ;  GLUEBALL ;  MODEL ;  ETA
学科分类: Physics
通讯作者: He, XG , Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China
部门归属: Nankai Univ, Dept Phys, Tianjin 300071, Peoples R China; Natl Taiwan Univ, Dept Phys, NCTS TPE, Taipei 10764, Taiwan; Acad Sinica, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: Recently the BES collaboration has announced the observation of a resonant state in the pi(+)pi(-)eta' spectrum in J/psi -> gamma pi(+)pi(-)eta' decay. Fitting the data with a 0(-+) state, the mass is determined to be 1833.7 MeV with 7.7 sigma statistic significance. This state is consistent with the one extracted from previously reported p (p) over bar threshold enhancement data in J/psi gamma p (p) over bar. We study the properties of this state using QCD anomaly and QCD sum rules, assuming X( 1835) to be a pseudoscalar, and we show that it is consistent with the data. We find that this state has a sizeable matrix element < 0 vertical bar G (G) over tilde vertical bar G(p)> , leading to branching ratios of (2.61-7.37) x 10(-3) and (2.21-10.61) x 10(-2) for J/psi -> gamma G(p) and for Gp -> pi(+)pi(-)eta', respectively. Combining the calculated branching ratio of J/psi -> gamma G(p) and data on threshold enhancement in J/psi -> gamma p (p) over bar, we determine the coupling for the Gp-p-(p) over bar interaction. We finally study the branching ratios of the other J/psi -> gamma + three mesons decay modes. We find that J/psi -> gamma G(p) -> gamma(pi(+)pi(-)eta', KK pi(0)) can provide useful tests for the mechanism proposed.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000244982800010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5794
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
He, Xiao-Gang,Li, Xue-Qian,Liu, Xiang,et al. Some properties of the newly observed X(1835) state at BES[J]. EUROPEAN PHYSICAL JOURNAL C,2007,49(3):731-736.
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