Poisson baseline of net-charge fluctuations in relativisticheavy ion collisions

  • Taking doubly charged particles, positive-negative charge pair production and the effects of volume fluctuations into account, the Poisson baseline of the fluctuations of net-charge is studied. Within the Poisson baseline, the cumulants of net-charge are derived. Comparing to the Skellam baseline of net-charge, we infer that doubly charged particles broaden the distributions of net-charge, while positive-negative charge pairs narrow the distributions. Using the ratios of doubly charged particles and positive-negative charge pairs from neutral resonance decays to the total positive charges from THERMINATOR 2, the first four orders of moments and the corresponding moment products are calculated in the Poisson baseline for Au + Au collisions at √sNN=200 GeV at RHIC/STAR. We find that the standard deviation is mainly influenced by the resonance decay, while the third and fourth order moments and corresponding moment products are mainly modified and fit the data of RHIC/STAR much better after including the effects of volume fluctuations.
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Xue Pan, Yu-Fu Lin, Li-Zhu Chen, Ming-Mei Xu and Yuan-Fang Wu. Poisson baseline of net-charge fluctuations in relativisticheavy ion collisions[J]. Chinese Physics C, 2018, 42(7): 074104. doi: 10.1088/1674-1137/42/7/074104
Xue Pan, Yu-Fu Lin, Li-Zhu Chen, Ming-Mei Xu and Yuan-Fang Wu. Poisson baseline of net-charge fluctuations in relativisticheavy ion collisions[J]. Chinese Physics C, 2018, 42(7): 074104.  doi: 10.1088/1674-1137/42/7/074104 shu
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Received: 2018-01-07
Revised: 2018-04-28
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    Supported by Fund Project of National Natural Science Foundation of China (11647093, 11405088, 11521064), Fund Project of Chengdu Technological University (2016RC004), the Major State Basic Research Development Program of China (2014CB845402) and the Ministry of Science and Technology (MoST)(2016YFE0104800)

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Poisson baseline of net-charge fluctuations in relativisticheavy ion collisions

  • 1.  School of Electronic Engineering, Chengdu Technological University, Chengdu 611730, China
  • 2.  Key Laboratory of Quark and Lepton Physics(MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
  • 3.  School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
Fund Project:  Supported by Fund Project of National Natural Science Foundation of China (11647093, 11405088, 11521064), Fund Project of Chengdu Technological University (2016RC004), the Major State Basic Research Development Program of China (2014CB845402) and the Ministry of Science and Technology (MoST)(2016YFE0104800)

Abstract: Taking doubly charged particles, positive-negative charge pair production and the effects of volume fluctuations into account, the Poisson baseline of the fluctuations of net-charge is studied. Within the Poisson baseline, the cumulants of net-charge are derived. Comparing to the Skellam baseline of net-charge, we infer that doubly charged particles broaden the distributions of net-charge, while positive-negative charge pairs narrow the distributions. Using the ratios of doubly charged particles and positive-negative charge pairs from neutral resonance decays to the total positive charges from THERMINATOR 2, the first four orders of moments and the corresponding moment products are calculated in the Poisson baseline for Au + Au collisions at √sNN=200 GeV at RHIC/STAR. We find that the standard deviation is mainly influenced by the resonance decay, while the third and fourth order moments and corresponding moment products are mainly modified and fit the data of RHIC/STAR much better after including the effects of volume fluctuations.

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