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Al-Turany, M.; Aleksandrov, D.; Andrei, C.; Anson, C.; Bala, R.; Baldisseri, A.; Barret, V.; Basu, S.; Batigne, G.; Beltran, L. G. E.; Berdnikov, Y.; Bhasin, A.; Bianchi, A.; Blume, C.; Borri, M.; Broker, T. A.; Caliva, A.; Capon, A. A.; Carena, F.; Chattopadhyay, S.; Chung, S. U.; Cosentino, M. R.; Costanza, S.; Crkovská, J.; Cuautle, E.; Das, S.; de Conti, C.; Dillenseger, P.; Fernández Téllez, A.; Floris, M.; Fragiacomo, E.; Gaardhøje, J. J.; Gianotti, P.; Giubellino, P.; Hadjidakis, C.; Haque, M. R.; Harris, J. W.; Hassan, H.; Helstrup, H.; Hughes, C.; Iga Buitron, S. A.; Jahnke, C.; Jena, C.; Jimenez Bustamante, R. T.; Kang, J. H.; Kubera, A. M.; Kweon, M. J.; La Pointe, S. L.; Lara, C.; Leardini, L.; Lehas, F.; Li, X.; Lippmann, C.; Litichevskyi, V.; López Torres, E.; Margutti, J.; Martinez Pedreira, M.; Masoni, A.; Meddi, F.; Mieskolainen, M. M.; Mitra, J.; Mohanty, B.; Morreale, A.; Munoz, M. I. A.; Munzer, R. H.; Musinsky, J.; Nania, R.; Natal da Luz, H.; Onderwaater, J.; Ortiz Velasquez, A.; Oskarsson, A.; Pacik, V.; Pandey, A. K.; Pei, H.; Pezzi, R. P.; Pinsky, L.; Ploskon, M.; Räsänen, S. S.; Rodríguez Cahuantzi, M.; Rossi, A.; Rustamov, A.; Sandoval, A.; Sas, M. H. P.; Senyukov, S.; Shahoyan, R.; Sharma, A.; Sharma, N.; Shirinkin, S.; Siemiarczuk, T.; Snellings, R. J. M.; Sugitate, T.; Suire, C.; Torres, S. R.; Tumkin, A.; Umaka, E. N.; Vercellin, E.; Wilk, G.; Willems, G. A.; Yalcin, S.; Zhou, Z.
The journal of high energy physics, 07/2018, Letnik: 2018, Številka: 7Journal Article
A bstract Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at s N N = 5.02 and 2.76 TeV are reported in the pseudorapidity range | η | < 0.8 and transverse momentum 0.2 < p T < 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) μ b −1 in the centrality range 0-80%, is analysed. Flow coefficients up to the sixth flow harmonic ( v 6 ) are reported and a detailed comparison among results at the two energies is carried out. The p T 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 n ( p T ) ∼ p T n /3 is observed for all flow harmonics at low p T (0.2 < p T < 3 GeV/ c ). At the same time, the ratios v n / v m n / m are observed to be essentially independent of p T for most centralities up to about p T = 10 GeV/ c . Analysing the differences among higher-order cumulants of elliptic flow ( v 2 ), which have different sensitivities to flow fluctuations, a measurement of the standardised skewness of the event-by-event v 2 distribution P ( v 2 ) is reported and constraints on its higher moments are provided. The Elliptic Power distribution is used to parametrise P ( v 2 ), 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.
