Determination of J/psi leptonic branching fraction via psi(2S)->pi(+)pi(-)J/psi

	Determination of J/psi leptonic branching fraction via psi(2S)->pi(+)pi(-)J/psi
	BES Collaboration
刊名	PHYSICAL REVIEW D
	1998
卷号	58 期号:9 页码:92006
通讯作者	Bai, JZ (reprint author), Inst High Energy Phys, Beijing 100039, Peoples R China.
英文摘要	A comparison of the rates for psi(2S) --> pi(+) pi(-) J/psi, J/psi --> l(+)l(-) and J/psi --> anything is used to determine the J/psi leptonic branching fractions. The results are B(J/psi --> e(+)e(-)) = (5.90 +/- 0.05 +/- 0.10)% and B(J/psi --> mu(+)mu(-)) = (5.84 +/- 0.06 +/- 0.10)%, where the first error is statistical and the second is systematic. Assuming lepton universality, the leptonic branching fraction of the J/psi is B(J/psi --> l(+)l(-)) = (5.87 +/- 0.04 +/- 0.09)% per species. This result is used to estimate the QCD scale factor Lambda(MS)((4)) and the strong coupling constant alpha(s). [S0556-2821(98)07021-0].
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000076735900011
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/227947]
专题	高能物理研究所_实验物理中心
推荐引用方式 GB/T 7714	BES Collaboration. Determination of J/psi leptonic branching fraction via psi(2S)->pi(+)pi(-)J/psi[J]. PHYSICAL REVIEW D,1998,58(9):92006.
APA	BES Collaboration.(1998).Determination of J/psi leptonic branching fraction via psi(2S)->pi(+)pi(-)J/psi.PHYSICAL REVIEW D,58(9),92006.
MLA	BES Collaboration."Determination of J/psi leptonic branching fraction via psi(2S)->pi(+)pi(-)J/psi".PHYSICAL REVIEW D 58.9(1998):92006.