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Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at √sNN=5.02 and 2.76 TeV
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Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at √sNN=5.02 and 2.76 TeV

S. Acharya, F.T. Acosta, D. Adamová, J. Adolfsson, M.M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S.U. Ahn, …
Journal of High Energy Physics, 卷.2018(7), 103
07/2018
DOI: https://doi.org/10.1007/JHEP07(2018)103

摘要

Heavy Ion Experiments Nuclear and High Energy Physics
Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at sNN=5.02 and 2.76 TeV are reported in the pseudorapidity range |η| < 0.8 and transverse momentum 0.2 < p <sub>T</sub> < 50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding to an integrated luminosity of 12.7 (2.0) μb <sup>−1</sup> in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic (v <sub>6</sub> ) are reported and a detailed comparison among results at the two energies is carried out. The p <sub>T</sub> dependence of anisotropic flow coefficients and its evolution with respect to centrality and harmonic number n are investigated. An approximate power-law scaling of the form v <sub>n</sub> (p <sub>T</sub> ) ∼ p <sub>T</sub> <sup>n/3</sup> is observed for all flow harmonics at low p <sub>T</sub> (0.2 < p <sub>T</sub> < 3 GeV/c). At the same time, the ratios v <sub>n</sub> /v <sub>m</sub> <sup>n/ m</sup> are observed to be essentially independent of p <sub>T</sub> for most centralities up to about p <sub>T</sub> = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v <sub>2</sub> ), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v <sub>2</sub> distribution P(v <sub>2</sub> ) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P(v <sub>2</sub> ), extracting its parameters from fits to cumulants. The measurements are compared to different model predictions in order to discriminate among initial-state models and to constrain the temperature dependence of the shear viscosity to entropy-density ratio.[Figure not available: see fulltext.].

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