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Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at root s=7 TeV
CMS Collaboration
2013
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号73期号:12
通讯作者Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
摘要Characteristics of multi-particle production in proton-proton collisions at root s = 7 TeV are studied as a function of the charged-particle multiplicity, N (ch). The produced particles are separated into two classes: those belonging to jets and those belonging to the underlying event. Charged particles are measured with pseudorapidity |eta|< 2.4 and transverse momentum p (T)> 0.25 GeV/c. Jets are reconstructed from charged-particles only and required to have p (T)> 5 GeV/c. The distributions of jet p (T), average p (T) of charged particles belonging to the underlying event or to jets, jet rates, and jet shapes are presented as functions of N (ch) and compared to the predictions of the pythia and herwig event generators. Predictions without multi-parton interactions fail completely to describe the N (ch)-dependence observed in the data. For increasing N (ch), pythia systematically predicts higher jet rates and harder p (T) spectra than seen in the data, whereas herwig shows the opposite trends. At the highest multiplicity, the data-model agreement is worse for most observables, indicating the need for further tuning and/or new model ingredients.
关键词PHYSICS LHC QCD
学科领域Physics
DOI10.1140/epjc/s10052-013-2674-5
收录类别SCI
语种英语
WOS类目Physics, Particles & Fields
WOS记录号WOS:000328342400001
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被引频次:7[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/311005/213632
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. Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at root s=7 TeV[J]. EUROPEAN PHYSICAL JOURNAL C,2013,73(12).
APA CMS Collaboration.(2013).Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at root s=7 TeV.EUROPEAN PHYSICAL JOURNAL C,73(12).
MLA CMS Collaboration."Jet and underlying event properties as a function of charged-particle multiplicity in proton-proton collisions at root s=7 TeV".EUROPEAN PHYSICAL JOURNAL C 73.12(2013).
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