Speaker
Description
The chiral magnetic effect is a good observable to investigate the topological and electromagnetic properties of the QGP. But the $\gamma$ correlator, a common observable used to detect the CME, contains both contribution from the CME and its background. This observable can not identify the CME from its background. Recently, a new observable of $R_{\Psi_{m}}$ has been proposed[1-4], which is expected to distinguish the CME from the background. We apply mixing particles method and shuffling particles method to calculate $R_{\Psi_{m}}$ using a multiphase transport model without or with a percentage of CME-induced charge separation[5,6]. From the results, we found that the shape of final $R_{\Psi_{2}}$ distribution is flat for the case without CME[7], but concave for that with some amount of the CME. By comparing the responses of $R_{\Psi_{2}}$ and $\gamma$ to the strength of the CME, we found that the CME signal can survive only when the initial charge separation percentage is large enough (more than $5\%$), which indicates a nonlinear sensitivity of these observables to the CME due to strong final state interactions.
[1]N. N. Ajitanand, R. A. Lacey, A. Taranenko, J. M. Alexander, Phys. Rev. C 83. 011901 (2011), [arXiv:1009.5624].
[2]N. Magdy, S. Z. Shi, J. F. Liao, N. Ajitanand, R. A. Lacey, Phys. Rev. C 97. 061901 (2018), [arXiv:1710.01717].
[3]Y. C. Feng, J. Zhao, F. Q. Wang, Phys. Rev. C 98. 034904 (2018), [arXiv:1803.02860].
[4]P. Bo$\mathrm{\dot{z}}$ek, Phys. Rev. C 97. 034907 (2018), [arXiv:1711.02563].
[5]G. L. Ma, B. Zhang, Phys. Lett. B 700. 39 (2011), [arXiv:1101.1701 [nucl-th]].
[6]L. Huang, C. W. Ma, G. L. Ma, Phys. Rev. C 97. 034909 (2018), [arXiv:1711.00637].
[7]L. Huang, M. W. Nie, G. L. Ma, [arXiv:1906.11631].
