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IntroductionAnalysisMethodTheResultsSummaryTheA-Acollisionsconsistsofthefourstagesasfollowsafterinitialstate.EllipticflowinHeavyIonCollisionsEllipticflowinHeavyIonCollisionsEllipticflowinHeavyIonCollisionsSTAR+PHENIXValencequarkscalingappearstofailoverwholePTrange.8ZhiQiu,Phys.Rew.C84,024911(2011)R.Thorsten,arXiv:1401.2069(2014)WeemploythenewissueofapartonandhadroncascademodelPACIAE2.1tocalculatethechargedparticleprobabilitydensitydistributionofv2andε2inPb+Pbcollisionsat√sNN=2.76TeV.ThecalculatedresultsarecomparedwiththeATLASdataandtherelationbetweenv2andε2arefurtherinvestigated.AnalysisMethodAnalysisMethodAnalysisMethodAnalysisMethodAnalysisMethodTheResultsofeccentricitiesTheResultsofcomparisonv2andε2Fig.4Thechargedparticle<v2>distributioncalculatedbyourmodel,asafunctionofε2,inPb-PbcollisionsTheResultsofcomparisonδv2andε2Fig.6Theδε2inPACIAEModelcomparewithδv2ofATLASinvariouscentralitiesofPb-PbcollisionsatsNN=2.76TeV.Fig.7ThePACIAEδv2incomparisonwiththeATLASdatainvariouscentrality.SummaryandOutlook24