Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision

  • We propose a novel method to search for the chiral magnetic effect (CME) in heavy ion collisions. We argue that the relative strength of the magnetic field (mainly from spectator protons and responsible for the CME) with respect to the reaction plane and the participant plane is opposite to that of the elliptic flow background arising from the fluctuating participant geometry. This opposite behavior in a single collision system, hence with small systematic uncertainties, can be exploited to extract the possible CME signal from the flow background. The method is applied to existing data from hic, and the outcome discussed.
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Hao-Jie Xu, Jie Zhao, Xiao-Bao Wang, Han-Lin Li, Zi-Wei Lin, Cai-Wan Shen and Fu-Qiang Wang. Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision[J]. Chinese Physics C, 2018, 42(8): 084103. doi: 10.1088/1674-1137/42/8/084103
Hao-Jie Xu, Jie Zhao, Xiao-Bao Wang, Han-Lin Li, Zi-Wei Lin, Cai-Wan Shen and Fu-Qiang Wang. Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision[J]. Chinese Physics C, 2018, 42(8): 084103.  doi: 10.1088/1674-1137/42/8/084103 shu
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Received: 2018-04-26
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    Supported by National Natural Science Foundation of China (11647306, 11747312, U1732138, 11505056, 11605054, 11628508) and US Department of Energy (DE-SC0012910)

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Varying the chiral magnetic effect relative to flow in a single nucleus-nucleus collision

  • 1.  School of Science, Huzhou University, Huzhou, Zhejiang 313000, China
  • 2.  Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
  • 3.  College of Science, Wuhan University of Science and Technology, Wuhan, Hubei 430065, China
  • 4. Department of Physics, East Carolina University, Greenville, North Carolina 27858, USA
  • 5. Key Laboratory of Quarks and Lepton Physics(MOE) and Institute of Particle Physics, Central China Normal University, Wuhan, Hubei 430079, China
  • 6. School of Science, Huzhou University, Huzhou, Zhejiang 313000, China
  • 7. Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907, USA
Fund Project:  Supported by National Natural Science Foundation of China (11647306, 11747312, U1732138, 11505056, 11605054, 11628508) and US Department of Energy (DE-SC0012910)

Abstract: We propose a novel method to search for the chiral magnetic effect (CME) in heavy ion collisions. We argue that the relative strength of the magnetic field (mainly from spectator protons and responsible for the CME) with respect to the reaction plane and the participant plane is opposite to that of the elliptic flow background arising from the fluctuating participant geometry. This opposite behavior in a single collision system, hence with small systematic uncertainties, can be exploited to extract the possible CME signal from the flow background. The method is applied to existing data from hic, and the outcome discussed.

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