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Decipher the $R_{\Psi_{m}}$ correlator in search for the chiral magnetic effect in relativistic heavy ion collisions
- Source :
- Phys. Rev. C 103, 034912 (2021)
- Publication Year :
- 2020
-
Abstract
- Background: The chiral magnetic effect (CME) is extensively studied in heavy-ion collisions at RHIC and the LHC. An azimuthal correlator called $R_{\Psi_{m}}$ was proposed to measure the CME. By observing the same $R_{\Psi_{2}}$ and $R_{\Psi_{3}}$ (convex) distributions from A Multi-Phase Transport (AMPT) model, by contrasting data and model as well as large and small systems and by event shape engineering (ESE), a recent preprint (arXiv:2006.04251v1) from STAR suggests that the $R_{\Psi_{m}}$ observable is sensitive to the CME signal and relatively insensitive to backgrounds, and their Au+Au data are inconsistent with known background contributions. Purpose: We examine those claims by studying the robustness of the $R_{\Psi_{m}}$ observable using AMPT as well as toy model simulations. We compare $R_{\Psi_{m}}$ to the more widely used $\Delta\gamma$ azimuthal correlator to identify their commonalities and differences. Methods: We use AMPT to simulate Au+Au, p+Au, and d+Au collisions at $\sqrt{s_{NN}} = 200 \text{ GeV}$, and study the responses of $R_{\Psi_{m}}$ to anisotropic flow backgrounds in the model. We also use a toy model to simulate resonance flow background and input CME signal to investigate their effects in $R_{\Psi_{2}}$. Additionally we use the toy model to perform an ESE analysis to compare to STAR data as well as predict the degree of sensitivity of $R_{\Psi_{2}}$ to isobar collisions with the event statistics taken at RHIC. ...<br />Comment: 18 pages, 13 figures
- Subjects :
- Nuclear Theory
Nuclear Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. C 103, 034912 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2011.01123
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevC.103.034912