## Systematic studies of correlations between different order flow harmonics in Pb-Pb collisions at $\sqrt{{\textit s}_{\rm NN}}=2.76$ TeV

### S. Acharya , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Jeremi Niedziela , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Hanna Zbroszczyk

#### Abstract

The correlations between event-by-event fluctuations of anisotropic flow harmonic amplitudes have been measured in Pb-Pb collisions at $\sqrt{{\textit s}_{\rm NN}}=2.76$ with the ALICE detector at the Large Hadron Collider. The results are reported in terms of multiparticle correlation observables dubbed symmetric cumulants. These observables are robust against biases originating from nonflow effects. The centrality dependence of correlations between the higher order harmonics (the quadrangular v4 and pentagonal v5 flow) and the lower order harmonics (the elliptic v2 and triangular v3 flow) is presented. The transverse momentum dependences of correlations between v3 and v2 and between v4 and v2 are also reported. The results are compared to calculations from viscous hydrodynamics and a multiphase transport (AMPT) model calculations. The comparisons to viscous hydrodynamic models demonstrate that the different order harmonic correlations respond differently to the initial conditions and the temperature dependence of the ratio of shear viscosity to entropy density (η/s).Asmall average value of η/s is favored independent of the specific choice of initial conditions in the models. The calculations with the AMPT initial conditions yield results closest to the measurements. Correlations among the magnitudes of v2, v3, and v4 show moderate pT dependence in midcentral collisions. This might be an indication of possible viscous corrections to the equilibrium distribution at hadronic freeze-out, which might help to understand the possible contribution of bulk viscosity in the hadronic phase of the system. Together with existing measurements of individual flow harmonics, the presented results provide further constraints on the initial conditions and the transport properties of the system produced in heavy-ion collisions.
Collective authorALICE Collaboration
Author S. Acharya
S. Acharya,,
-
, Łukasz Graczykowski (FP / NPD)
Łukasz Graczykowski,,
- Nuclear Physics Division
, Monika Jakubowska (FoEE / ICIE)
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik (FP / NPD)
Małgorzata Janik,,
- Nuclear Physics Division
, Adam Kisiel (FP / NPD)
- Nuclear Physics Division
, Julian Myrcha (FEIT / IN)
Julian Myrcha,,
- The Institute of Computer Science
, Jeremi Niedziela (FP / NPD)
Jeremi Niedziela,,
- Nuclear Physics Division
, Janusz Oleniacz (FP / NPD)
Janusz Oleniacz,,
- Nuclear Physics Division
, Jan Pluta (FP / NPD)
Jan Pluta,,
- Nuclear Physics Division
, Przemysław Rokita (FEIT / IN)
Przemysław Rokita,,
- The Institute of Computer Science
et al.`
Total number of authors1050
Journal seriesPhysical Review C, ISSN 2469-9985, e-ISSN 2469-9993 [1538-4497], (A 35 pkt)
Issue year2018
Vol97
Pages024906-1-024906-23
Publication size in sheets1.1
ASJC Classification3106 Nuclear and High Energy Physics
DOIDOI:10.1103/PhysRevC.97.024906
URL https://journals.aps.org/prc/abstract/10.1103/PhysRevC.97.024906
projectDevelopment of new algorithms in the areas of software and computer architecture, artificial intelligence and information systems and computer graphics . Project leader: Arabas Jarosław, , Phone: +48 22 234 7432, start date 01-06-2017, end date 31-10-2018, II/2017/DS/1, Completed
WEiTI Działalność statutowa
Languageen angielski
File
 PhysRevC.97_1.pdf 1.13 MB
Score (nominal)45
ScoreMinisterial score = 35.0, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, ArticleFromJournal
Publication indicators WoS Citations = 3; WoS Impact Factor: 2017 = 3.304 (2) - 2017=3.106 (5)
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