Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5458
Title: Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at ?sNN = 2.76 TeV
Authors: CMS Collaboration
Karapınar, Güler
Keywords: Relativistic heavy ion physics
Heavy ions
Harmonic flow
Transverse momentum
Issue Date: Feb-2014
Publisher: Springer Verlag
Source: Chatrchyan, S., Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., Erö, J., ...CMS Collaboration (2014). Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √sNN = 2.76 TeV. Journal of High Energy Physics, 2014(2). doi:10.1007/JHEP02(2014)088
Abstract: Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √s NN = 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 v2 to v6, are extracted as a function of particle transverse momentum. At higher transverse momentum, the v2 harmonic becomes significantly smaller than the higher-orDer vn (n ≥ 3). The pT-averaged v2 and v3 are found to be equal within 2%, while higher-orDer vn 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.
URI: http://doi.org/10.1007/JHEP02(2014)088
http://hdl.handle.net/11147/5458
ISSN: 1029-8479
Appears in Collections:Mathematics / Matematik
Rectorate / Rektörlük
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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