Observation of a near-threshold enhancement in the p(p)over-bar mass spectrum from radiative J/psi ->gamma p(p)over-bar deecays

	Observation of a near-threshold enhancement in the p(p)over-bar mass spectrum from radiative J/psi ->gamma p(p)over-bar deecays
	BES Callaboration
刊名	PHYSICAL REVIEW LETTERS
	2003
卷号	91 期号:2
关键词	TIME-LIKE REGION SYMMETRY-BREAKING DYNAMICAL MODEL FORM-FACTORS SUPERCONDUCTIVITY ANALOGY MESON
通讯作者	Bai, JZ (reprint author), Inst High Energy Phys, Beijing 100039, Peoples R China.
英文摘要	We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of p (p) over bar pairs from radiative J/psi-->gammap (p) over bar decays. No similar structure is seen in J/psi-->pi(0)p (p) over bar decays. The results are based on an analysis of a 58x10(6) event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit-Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m(p) at M=1859(-10)(+3) (stat)(-25)(+5)(syst) MeV/c(2) and the total width is Gamma<30 MeV/c(2) at the 90% confidence level. These mass and width values are not consistent with the properties of any known particle.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000184086000007
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/212295]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	BES Callaboration. Observation of a near-threshold enhancement in the p(p)over-bar mass spectrum from radiative J/psi ->gamma p(p)over-bar deecays[J]. PHYSICAL REVIEW LETTERS,2003,91(2).
APA	BES Callaboration.(2003).Observation of a near-threshold enhancement in the p(p)over-bar mass spectrum from radiative J/psi ->gamma p(p)over-bar deecays.PHYSICAL REVIEW LETTERS,91(2).
MLA	BES Callaboration."Observation of a near-threshold enhancement in the p(p)over-bar mass spectrum from radiative J/psi ->gamma p(p)over-bar deecays".PHYSICAL REVIEW LETTERS 91.2(2003).