Observation of two new N* peaks in J/psi -> p pi- (n)over-bar and p pi+ (n)over-bar decays

	*Observation of two new N peaks in J/psi -> p pi- (n)over-bar and p pi+ (n)over-bar decays**
	BES Callaboration
刊名	PHYSICAL REVIEW LETTERS
	2006
卷号	97 期号:6
关键词	J/PSI P(P)OVER-BAR-ETA DETECTOR BARYONS NUCLEON MODEL
通讯作者	Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100039, Peoples R China.
英文摘要	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.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000239690900012
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/212705]
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 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).