Impact of magnetic-field fluctuations on measurements of the chiral magnetic effect in collisions of isobaric nuclei

Zhao, Xin-Li (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China) (University of Chinese Academy of Sciences, Beijing 100049, China) ; Ma, Guo-Liang (Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China) (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China) ; Ma, Yu-Gang (Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China) (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China)

09 April 2019

Abstract: We investigate the properties of electromagnetic fields in isobaric 4496Ru+4496Ru and 4096Zr+4096Zr collisions at s=200GeV by using a multiphase transport model with special emphasis on the correlation between magnetic-field direction and participant plane angle Ψ2 (or spectator plane angle Ψ2SP), i.e., cos2(ΨBΨ2) [or cos2(ΨBΨ2SP)]. We confirm that the magnetic fields of 4496Ru+4496Ru collisions are stronger than those of 4096Zr+4096Zr collisions due to their larger proton fraction. We find that the deformation of nuclei has a non-negligible effect on cos2(ΨBΨ2) especially in peripheral events. Because the magnetic-field direction is more strongly correlated with Ψ2SP than with Ψ2, the relative difference of the chiral magnetic effect observable with respect to Ψ2SP is expected to be able to reflect much cleaner information about the chiral magnetic effect with less influences of deformation.


Published in: Physical Review C 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevC.99.034903
arXiv: 1901.04151
License: CC-BY-4.0



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