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Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV
CMS Collaboration
2014
发表期刊JOURNAL OF HIGH ENERGY PHYSICS
期号2
通讯作者Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
摘要Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at = 2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 mu b -aEuro parts per thousand 1. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v (2) to v (6), are extracted as a function of particle transverse momentum. At higher transverse momentum, the v (2) harmonic becomes significantly smaller than the higher-order v (n) (n a parts per thousand yenaEuro parts per thousand 3). The p (T)-averaged v (2) and v (3) are found to be equal within 2%, while higher-order v (n) decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented.
关键词QUARK-GLUON PLASMA TRANSVERSE-MOMENTUM DEPENDENCE ELLIPTIC FLOW ECCENTRICITY FLUCTUATIONS ANGULAR-CORRELATIONS ROOT-S(NN)=2.76 TEV COLLABORATION PERSPECTIVE SPECTRA MATTER
学科领域Physics
DOI10.1007/JHEP02(2014)088
收录类别SCI
语种英语
WOS类目Physics, Particles & Fields
WOS记录号WOS:000331974800001
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被引频次:30[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/311005/213667
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. Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV[J]. JOURNAL OF HIGH ENERGY PHYSICS,2014(2).
APA CMS Collaboration.(2014).Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV.JOURNAL OF HIGH ENERGY PHYSICS(2).
MLA CMS Collaboration."Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at=2.76 TeV".JOURNAL OF HIGH ENERGY PHYSICS .2(2014).
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