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dc.contributor.authorBaarmand, Marc M.
dc.contributor.authorDorney, B.
dc.contributor.authorHohlmann, Marcus
dc.contributor.authorKalakhety, H.
dc.contributor.authorYumiceva, Francisco X.
dc.contributor.authorChatrchyan, S. A.
dc.contributor.authorKhachatryan, Vladimir A.
dc.contributor.authorSirunyan, A. M.
dc.contributor.authorTumasyan, A. R.
dc.contributor.authorAdam, Wolfgang
dc.date.accessioned2014-09-10T21:21:22Z
dc.date.available2014-09-10T21:21:22Z
dc.date.issued2014-02-20
dc.identifier.citationChatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., . . . Smith, W. H. (2014). Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at vsNN = 2.76 TeV. Journal of High Energy Physics, 2014(2)en_US
dc.identifier.urihttp://hdl.handle.net/11141/317
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.language.isoen_USen_US
dc.rightsThis article is distributed under the creative commons license CC-BY 4.0.en_US
dc.rights.urihttp://jhep.sissa.it/jhep/help/JHEP/CR_OA.pdfen_US
dc.titleStudies of azimuthal dihadron correlations in ultra-central PbPb collisions at √sNN = 2.76 TeVen_US
dc.typeArticleen_US
dc.identifier.doi10.1007/JHEP02(2014)088


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