## Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

### J Adam , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Janusz Oleniacz , Jan Pluta , Adam Szczepankiewicz , Maciej Szymański , Anna Zaborowska , Krzysztof Sielewicz

#### Abstract

The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and $\mathrm{p}+\overline{\mathrm{p}}$ in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3 < pT< 6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT< 3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics. Higher harmonic flow coefficients of identified hadrons in Pb-Pb collisions at s N N = 2.76 $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV (PDF Download Available). Available from: https://www.researchgate.net/publication/308757915_Higher_harmonic_flow_coefficients_of_identified_hadrons_in_Pb-Pb_collisions_at_s_N_N_276_sqrts_mathrmNN276_TeV [accessed Apr 18, 2017].
Collective authorALICE Collaboration
-
, Łukasz Graczykowski ZFJ
Łukasz Graczykowski,,
- Nuclear Physics Division
, Monika Jakubowska ISEP
Monika Jakubowska,,
- The Institute of Control and Industrial Electronics
, Małgorzata Janik ZFJ
Małgorzata Janik,,
- Nuclear Physics Division
- Nuclear Physics Division
, Janusz Oleniacz ZFJ
Janusz Oleniacz,,
- Nuclear Physics Division
, Jan Pluta ZFJ
Jan Pluta,,
- Nuclear Physics Division
, Adam Szczepankiewicz II - European Organization for Nuclear Research Geneva Switzerland (CERN )
- The Institute of Computer Science
, Maciej Szymański ZFJ
Maciej Szymański,,
- Nuclear Physics Division
, Anna Zaborowska ZFJ
Anna Zaborowska,,
- Nuclear Physics Division
et al.
Total number of authors1004
Journal seriesJournal of High Energy Physics, ISSN 1029-8479 [1126-6708]
Issue year2016
Vol9
No164
Pages1-44
Publication size in sheets2.15
DOIDOI:10.1007/JHEP09(2016)164
URL https://www.researchgate.net/publication/308757915
Languageen angielski
File
 Higher_harmonic_flow_coefficients_of_identified_ha.pdf 2.67 MB
Score (nominal)40
ScoreMinisterial score = 40.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 6.063 (2) - 2016=4.992 (5)
Citation count*0
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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