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dc.contributor.authorChatrchyan, S.
dc.contributor.authorIşıldak, Bora
dc.date.accessioned2014-11-10T07:37:27Z
dc.date.available2014-11-10T07:37:27Z
dc.date.issued2014-02
dc.identifier.issn1029-8479
dc.identifier.urihttp://link.springer.com/article/10.1007%2FJHEP02(2014)088
dc.identifier.urihttp://hdl.handle.net/10679/522
dc.description.abstractAzimuthal dihadron correlations of charged particles have been measured in PbPb collisions at sNN−−−√ = 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 μb − 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 ≥ 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.en_US
dc.description.sponsorshipSCOAP
dc.language.isoengen_US
dc.publisherSpringer Science+Business Mediaen_US
dc.relation.ispartofJournal of High Energy Physics
dc.rightsopenAccess
dc.titleStudies of azimuthal dihadron correlations in ultra-central PbPb collisions at sNN−−−√ =2.76 TeVen_US
dc.typeArticleen_US
dc.description.versionpublisher version
dc.peerreviewedyesen_US
dc.publicationstatuspublisheden_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID124605
dc.contributor.ozuauthorIşıldak, Bora
dc.creatorThe CMS Collaboration
dc.identifier.volume2014
dc.identifier.issue88
dc.identifier.wosWOS:000331974800001
dc.identifier.doi10.1007/JHEP02(2014)088
dc.subject.keywordsRelativistic heavy ion physicsen_US
dc.subject.keywordsHeavy Ionsen_US
dc.subject.keywordsHarmonic flowen_US
dc.identifier.scopusSCOPUS:2-s2.0-84901649028


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