Study of W boson production in PbPb and pp collisions at root s(NN)=2.76 TeV

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	Study of W boson production in PbPb and pp collisions at root s(NN)=2.76 TeV
	CMS Collaboration
刊名	PHYSICS LETTERS B
	2012
卷号	715 期号:1--3 页码:66-87
关键词	HEAVY-ION COLLISIONS PRODUCTION CROSS-SECTION ATLAS DETECTOR ROOT-S=7 TEV LHC
通讯作者	Sphicas, P (reprint author), CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland.
英文摘要	A measurement is presented of W-boson production in PbPb collisions carried out at a nucleon-nucleon (NN) centre-of-mass energy root S-NN of 2.76 TeV at the LHC using the CMS detector. In data corresponding to an integrated luminosity of 7.3 mu b(-1), the number of W -> mu v(mu) decays is extracted in the region of muon pseudorapidity vertical bar eta mu vertical bar < 2.1 and transverse momentum p(T)(mu) > 25 GeV/c. Yields of muons found per unit of pseudorapidity correspond to (159 +/- 10(stat.) +/- 12(syst.)) x 10(-8) W and (154 +/- 10(stat.) +/- 12(syst.)) x 10(-8) W- bosons per minimum-bias PbPb collision. The dependence of W production on the centrality of PbPb collisions is consistent with a scaling of the yield by the number of incoherent NN collisions. The yield of W bosons is also studied in a sample of pp interactions at root S = 2.76 TeV corresponding to an integrated luminosity of 231 nb(-1). The individual W+ and W- yields in PbPb and pp collisions are found to agree, once the neutron and proton content in Pb nuclei is taken into account. Likewise, the difference observed in the dependence of the positive and negative muon production on pseudorapidity is consistent with next-to-leading-order perturbative QCD calculations. (c) 2012 CERN. Published by Elsevier 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:000308519000011
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213325]
专题	高能物理研究所_粒子天体物理中心
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	CMS Collaboration. Study of W boson production in PbPb and pp collisions at root s(NN)=2.76 TeV[J]. PHYSICS LETTERS B,2012,715(1--3):66-87.
APA	CMS Collaboration.(2012).Study of W boson production in PbPb and pp collisions at root s(NN)=2.76 TeV.PHYSICS LETTERS B,715(1--3),66-87.
MLA	CMS Collaboration."Study of W boson production in PbPb and pp collisions at root s(NN)=2.76 TeV".PHYSICS LETTERS B 715.1--3(2012):66-87.