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

Journal Article · · Journal of High Energy Physics (Online)
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The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π ± , K ± and p + $$\bar{p}$$ in Pb-Pb collisions at √sNN=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 (p T ) values below ≈ 3 GeV/c. In the intermediate p T region (3 < p T < 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 p T < 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 p T and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of p T for all harmonics.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
The ALICE collaboration
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1377469
Journal Information:
Journal of High Energy Physics (Online), Vol. 2016, Issue 9; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (9)

Azimuthal anisotropy in Cu+Au collisions at s NN = 200 GeV journal July 2018
Transport coefficients of a hot QCD medium and their relative significance in heavy-ion collisions journal November 2017
Anomalous Evolution of the Near-Side Jet Peak Shape in Pb-Pb Collisions at s N N = 2.76 TeV journal September 2017
Collective flow in 2.76 and 5.02 A TeV Pb + Pb collisions journal September 2017
Transport coefficients of hot magnetized QCD matter beyond the lowest Landau level approximation journal February 2019
Collective flow and hydrodynamics in large and small systems at the LHC journal June 2017
Pseudorapidity distribution and decorrelation of anisotropic flow within the open-computing-language implementation CLVisc hydrodynamics journal June 2018
Wiedemann-Franz law for hot QCD matter in a color string percolation scenario journal September 2019
Bulk viscosity of a hot QCD medium in a strong magnetic field within the relaxation-time approximation journal June 2018


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