A DIRECT MEASUREMENT OF THE INVISIBLE WIDTH OF THE Z FROM SINGLE-PHOTON COUNTING

	A DIRECT MEASUREMENT OF THE INVISIBLE WIDTH OF THE Z FROM SINGLE-PHOTON COUNTING
	ALEPH Collaboration
刊名	PHYSICS LETTERS B
	1993
卷号	313 期号:3-4 页码:#REF!
通讯作者	BUSKULIC, D (reprint author), CNRS, IN2P3, PHYS PARTICULES LAB, F-74019 ANNECY LE VIEUX, FRANCE.
英文摘要	The ALEPH detector at LEP is used to study single photon events in e+e- collisions at the Z resonance. In a total data sample of 15.7 pb-1 taken in 1990 and 1991 scanning the resonance, 400 events were recorded where each has a single deposition of more than 1.5 GeV measured in the polar angular region \costheta(gamma)\ < 0.74 of the electromagnetic calorimeter. It is shown that this number of events can be accounted for by known processes. After subtraction of background events, the invisible width of the Z is determined to be 450 +/- 34(stat.) +/- 34(syst.) MeV. Using Z resonance parameters derived by ALEPH, the corresponding number of light neutrino generations is found to be 2.68 +/- 0.20(stat.) +/- 0.20(syst.).
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
WOS记录号	WOS:A1993LV80400027
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/227709]
专题	高能物理研究所_实验物理中心
推荐引用方式 GB/T 7714	ALEPH Collaboration. A DIRECT MEASUREMENT OF THE INVISIBLE WIDTH OF THE Z FROM SINGLE-PHOTON COUNTING[J]. PHYSICS LETTERS B,1993,313(3-4):#REF!.
APA	ALEPH Collaboration.(1993).A DIRECT MEASUREMENT OF THE INVISIBLE WIDTH OF THE Z FROM SINGLE-PHOTON COUNTING.PHYSICS LETTERS B,313(3-4),#REF!.
MLA	ALEPH Collaboration."A DIRECT MEASUREMENT OF THE INVISIBLE WIDTH OF THE Z FROM SINGLE-PHOTON COUNTING".PHYSICS LETTERS B 313.3-4(1993):#REF!.