Eccentricity fluctuations are not the only source of elliptic flow fluctuations in a multiphase transport model

  • Sources of event-by-event elliptic flow fluctuations in relativistic heavy-ion collisions are investigated in a multiphase parton transport model (AMPT). Besides the well-known initial eccentricity fluctuations, several other sources of elliptic flow dynamical fluctuations are identified. One is fluctuations in initial parton configurations at a given eccentricity. Configuration fluctuations are found to be as important as eccentricity fluctuations in elliptic flow development. A second is quantum fluctuations in parton-parton interactions during system evolution. A third is fluctuations caused by hadronization and final-state hadronic scatterings. The magnitudes of these fluctuations are investigated relative to the eccentricity fluctuations and the average elliptic flow magnitude. The fluctuations from the latter two sources are found to be negative. The results may have important implications for the interpretation of elliptic flow data.
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Kai Xiao, Feng Liu and Fu-Qiang Wang. Eccentricity fluctuations are not the only source of elliptic flow fluctuations in a multiphase transport model[J]. Chinese Physics C, 2017, 41(9): 094103. doi: 10.1088/1674-1137/41/9/094103
Kai Xiao, Feng Liu and Fu-Qiang Wang. Eccentricity fluctuations are not the only source of elliptic flow fluctuations in a multiphase transport model[J]. Chinese Physics C, 2017, 41(9): 094103.  doi: 10.1088/1674-1137/41/9/094103 shu
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Received: 2017-01-20
Revised: 2017-05-11
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    Supported by MOST, China, under 973 Grant 2015CB856901, National Natural Science Foundation of China (11521064, 11547143, 11228513), U.S. Department of Energy (DE-FG02-88ER40412), Fundamental Research Funds for the Central Universities, South-Central University for Nationalities (CZQ15001) and Excellent Doctorial Dissertation Cultivation Grant from Central China Normal University (2013YBZD18)

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Eccentricity fluctuations are not the only source of elliptic flow fluctuations in a multiphase transport model

    Corresponding author: Kai Xiao,
    Corresponding author: Feng Liu,
    Corresponding author: Fu-Qiang Wang,
  • 1. Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
  • 2. College of Electronics and Information Engineering, South-Central University for Nationalities, Wuhan 430074, China
  • 3.  Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
  • 4. Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
  • 5. School of Science, Huzhou University, Zhejiang 313000, China
Fund Project:  Supported by MOST, China, under 973 Grant 2015CB856901, National Natural Science Foundation of China (11521064, 11547143, 11228513), U.S. Department of Energy (DE-FG02-88ER40412), Fundamental Research Funds for the Central Universities, South-Central University for Nationalities (CZQ15001) and Excellent Doctorial Dissertation Cultivation Grant from Central China Normal University (2013YBZD18)

Abstract: Sources of event-by-event elliptic flow fluctuations in relativistic heavy-ion collisions are investigated in a multiphase parton transport model (AMPT). Besides the well-known initial eccentricity fluctuations, several other sources of elliptic flow dynamical fluctuations are identified. One is fluctuations in initial parton configurations at a given eccentricity. Configuration fluctuations are found to be as important as eccentricity fluctuations in elliptic flow development. A second is quantum fluctuations in parton-parton interactions during system evolution. A third is fluctuations caused by hadronization and final-state hadronic scatterings. The magnitudes of these fluctuations are investigated relative to the eccentricity fluctuations and the average elliptic flow magnitude. The fluctuations from the latter two sources are found to be negative. The results may have important implications for the interpretation of elliptic flow data.

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