Speaker
ling huang
(中科院上海应用物理研究所)
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, 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.
Summary
From the results, we found that the shape of final $R_{\Psi_{2}}$ distribution is flat for the case without CME, but concave for that with some amount of the CME. And we also study the stage evolution of $R_{\Psi_{2}}$ to understand the CME well. By comparing the responses of $R_{\Psi_{2}}$ and $\gamma$ to the strength of the CME, we observe that two observables show different nonlinear sensitivities to the CME. We found that the shape of $R_{\Psi_{2}}$ has an advantage in measuring a small amount of the CME but it requires large event statistics.
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Primary author
ling huang
(中科院上海应用物理研究所)
Co-authors
Dr
Guo-Liang Ma
(Fudan University)
Dr
Mao-wu Nie
(Institute of Frontier and Interdisciplinary Science, Shandong University)
