Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar

	Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar
	BESIII Callaboration
刊名	PHYSICAL REVIEW D
	2012
卷号	86 期号:3
关键词	ELECTROMAGNETIC FORM-FACTORS TIME-LIKE REGION QCD SUM-RULES NUCLEON DECAYS BARYON AMPLITUDES PHASE
通讯作者	Ablikim, M (reprint author), Inst High Energy Phys, Beijing 100049, Peoples R China.
英文摘要	The decays J/psi -> p (p) over bar and J/psi -> n (n) over bar have been investigated with a sample of 225.2 x 10(6) J/psi events collected with the BESIII detector at the BEPCII e(+)e(-) collider. The branching fractions are determined to be B(J/psi -> p (p) over bar) = (2.112 +/- 0.004 +/- 0.031 x 10(-3) and B(J/psi -> n (n) over bar) =(2.07 +/- 0.01 +/- 0.17) x 10(-3). Distributions of the angle theta between the proton or antineutron and the beam direction are well described by the form 1 + alpha cos(2)theta, and we find alpha = 0.595 +/- 0.012 +/- 0.015 for J/psi -> p (p) over bar and alpha = 0.50 +/- 0.04 +/- 0.21 for J/psi -> n (n) over bar. Our branching- fraction results suggest a large phase angle between the strong and electromagnetic amplitudes describing the J/psi -> N (N) over bar decay.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000308211400001
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213322]
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	BESIII Callaboration. Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar[J]. PHYSICAL REVIEW D,2012,86(3).
APA	BESIII Callaboration.(2012).Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar.PHYSICAL REVIEW D,86(3).
MLA	BESIII Callaboration."Study of J/psi -> p(p)over-bar and J/psi -> n(n)over-bar".PHYSICAL REVIEW D 86.3(2012).