A PRECISE MEASUREMENT OF GAMMA-Z-]B(B)BAR/GAMMA-Z-] HADRONS

	A PRECISE MEASUREMENT OF GAMMA-Z-]B(B)BAR/GAMMA-Z-] HADRONS
	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	A measurement of the partial width ratio GAMMA(bbBAR)/GAMMA(had) using a method which tags the Z --> bbBAR decays through the lifetime of the produced heavy hadrons is presented. This method relies on the tracking precision afforded by a double-sided silicon vertex detector. The tag algorithm makes a probabilistic interpretation of three-dimensional track impact parameters, using the data to measure the resolution. By tagging the two b hadrons separately, both GAMMA(bbBAR)/GAMMA(had) and the tag efficiency can be determined from the data. For a 26% efficiency of tagging a single b hadron within the vertex detector solid angle coverage, a purity of 96% is achieved. A value of GAMMA(bbBAR)/GAMMA(had) = 0.2192+/-0.0022(stat.)+/-0.0026(syst.)+/-0.0016(GAMMA(ccBAR)/GAMMA(had)) is found. Combining this result with other recent ALEPH GAMMA(bbBAR)/GAMMA(had) measurements gives a 95% confidence upper limit on the Standard Model top mass of M(t) < 228 GeV.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
WOS记录号	WOS:A1993LV80400028
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/227715]
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 PRECISE MEASUREMENT OF GAMMA-Z-]B(B)BAR/GAMMA-Z-] HADRONS[J]. PHYSICS LETTERS B,1993,313(3-4):#REF!.
APA	ALEPH Collaboration.(1993).A PRECISE MEASUREMENT OF GAMMA-Z-]B(B)BAR/GAMMA-Z-] HADRONS.PHYSICS LETTERS B,313(3-4),#REF!.
MLA	ALEPH Collaboration."A PRECISE MEASUREMENT OF GAMMA-Z-]B(B)BAR/GAMMA-Z-] HADRONS".PHYSICS LETTERS B 313.3-4(1993):#REF!.