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Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √sNN =2.76 TeV

AutorChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Graziano, A. ; López Virto, A. ; Marco, Rafael ; Marco, Jesús ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; Smith, W. H.
Palabras claveRelativistic heavy ion physics
Heavy Ions
Harmonic flow
Fecha de publicación20-feb-2014
EditorSpringer
CitaciónJournal of High Energy Physics 2: 88 (2014)
ResumenAzimuthal 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.
DescripciónChatrchyan, S. et al.
Versión del editorhttp://dx.doi.org/10.1007/JHEP02(2014)088
URIhttp://hdl.handle.net/10261/96843
DOI10.1007/JHEP02(2014)088
E-ISSN1029-8479
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