Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays

	Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays
	DELPHI Collaboration
刊名	PHYSICS LETTERS B
	2000
卷号	475 期号:3--4 页码:429-447
关键词	PRODUCTION-RATES BARYON PRODUCTION K-+/ Z(0) K-ASTERISK(0)(892) PI(+/-) PHYSICS
通讯作者	Abreu, P (reprint author), Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
英文摘要	Production of Sigma(-) and Lambda(1520) in hadronic Z decays has been measured using the DELPHI detector at LEP. The Sigma(-) is directly reconstructed as a charged track in the DELPHI microvertex detector and is identified by its Sigma --> n pi decay leading to a kink between the Sigma(-) and pi-track. The reconstruction of the Lambda(1520) resonance relies strongly on the particle identification capabilities of the barrel Ring Imaging Cherenkov detector and on the ionisation loss measurement of the TPC. Inclusive production spectra are measured for both particles. The production rates are measured to be [NSigma-/N-Z(had)] = 0.081 +/- 0.002 +/- 0.010, [N-Lambda(1520)/N-Z(had)] = 0.029 +/- 0.005 +/- 0.005. The production rate of the Lambda(1520) suggests that a large fraction of the stable baryons descend from orbitally excited baryonic states. It is shown that the baryon production rates in Z decays follow a universal phenomenological law related to isospin, strangeness and mass of the particles. (C) 2000 Elsevier Science B.V. All rights reserved.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000085735100029
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/212029]
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	DELPHI Collaboration. Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays[J]. PHYSICS LETTERS B,2000,475(3--4):429-447.
APA	DELPHI Collaboration.(2000).Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays.PHYSICS LETTERS B,475(3--4),429-447.
MLA	DELPHI Collaboration."Inclusive Sigma(-) and Lambda(1520) production in hadronic Z decays".PHYSICS LETTERS B 475.3--4(2000):429-447.