Issue |
EPJ Web Conf.
Volume 259, 2022
The 19th International Conference of Strangeness in Quark Matter (SQM 2021)
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|
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Article Number | 13013 | |
Number of page(s) | 4 | |
Section | Open and New (Parallel) | |
DOI | https://doi.org/10.1051/epjconf/202225913013 | |
Published online | 01 February 2022 |
https://doi.org/10.1051/epjconf/202225913013
CME search at STAR
1 Fudan University
2 Brookhaven National Laboratory
* e-mail: huy17@fudan.edu.cn
Published online: 1 February 2022
The hot and dense medium produced in relativistic heavy-ion collisions has been conjectured to be accompanied by an axial charge asymmetry that may lead to a separation of electric charges in the direction of the extremely strong magnetic field, also known as the Chiral Magnetic Effect (CME) [1–3]. The measurement of azimuthal correlator (∆γ) with respect to the spectator plane [5], gives us an opportunity to measure the possible CME fraction beyond the flow background. Preliminary results using this approach with combined Au+Au collisions at √SNN = 200 GeV and U+U at √SNN = 193 GeV show fCME at (8±4±8)%. Meanwhile, the observability of CME has been conjectured to be dependent on √SNN due to changes in the lifetime of the magnetic field, the strengths of CME signal and non-CME background. At lower energies, the Event Plane Detector (EPD) installed in the year 2018 provides a unique capability for CME search. The background scenario test at Au+Au √SNN = GeV by using ∆γ with respect to TPC and the new installed EPD shows a consistency with no-CME scenario in the current statistics. The method of the ongoing isobar blind analysis, and the latest sensitivity check with the eventby- event AVFD model on the different observables between Ru+Ru and Zr+Zr are also briefly discussed.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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