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Study of W boson production in PbPb and pp collisions at root s(NN)=2.76 TeV
CMS Collaboration
2012
发表期刊PHYSICS LETTERS B
卷号715期号:1--3页码:66-87
通讯作者Sphicas, P (reprint author), CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland.
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.
关键词HEAVY-ION COLLISIONS PRODUCTION CROSS-SECTION ATLAS DETECTOR ROOT-S=7 TEV LHC
学科领域Physics
DOI10.1016/j.physletb.2012.07.025
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000308519000011
引用统计
被引频次:63[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213325
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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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.
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