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Observation of two new N* peaks in J/psi -> p pi- (n)over-bar and p pi+ (n)over-bar decays
BES Callaboration
2006
发表期刊PHYSICAL REVIEW LETTERS
卷号97期号:6
通讯作者Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100039, Peoples R China.
摘要The decay J/psi ->(N) over barN pi provides an effective isospin 1/2 filter for the pi N system due to isospin conservation. Using 58x10(6) J/psi decays collected with the Beijing Electromagnetic Spectrometer at the Beijing Electron Positron Collider, more than 100 thousand J/psi -> p pi(-)<<(n)over bar>+c.c. events are obtained. Besides the two well-known N-* peaks at around 1500 MeV/c(2) and 1670 MeV/c(2), there are two new, clear N-* peaks in the p pi invariant mass spectrum around 1360 MeV/c(2) and 2030 MeV/c(2) with statistical significance of 11 sigma and 13 sigma, respectively. We identify these as the first direct observation of the N-*(1440) peak and a long-sought missing N-* peak above 2 GeV/c(2) in the pi N invariant mass spectrum.
关键词J/PSI P(P)OVER-BAR-ETA DETECTOR BARYONS NUCLEON MODEL
学科领域Physics
DOI10.1103/PhysRevLett.97.062001
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000239690900012
引用统计
被引频次:54[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212705
专题实验物理中心
作者单位中国科学院高能物理研究所
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BES Callaboration. Observation of two new N* peaks in J/psi -> p pi- (n)over-bar and p pi+ (n)over-bar decays[J]. PHYSICAL REVIEW LETTERS,2006,97(6).
APA BES Callaboration.(2006).Observation of two new N* peaks in J/psi -> p pi- (n)over-bar and p pi+ (n)over-bar decays.PHYSICAL REVIEW LETTERS,97(6).
MLA BES Callaboration."Observation of two new N* peaks in J/psi -> p pi- (n)over-bar and p pi+ (n)over-bar decays".PHYSICAL REVIEW LETTERS 97.6(2006).
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