Search for the chiral magnetic wave using anisotropic flow of identified particles at energies available at the BNL Relativistic Heavy Ion Collider

Le résumé fourni par la source

The chiral magnetic wave (CMW) has been theorized to propagate in the deconfined nuclear medium formed in high-energy heavy-ion collisions and to cause a difference in elliptic flow (${v}_{2}$) between negatively and positively charged hadrons. Experimental data consistent with the CMW have been reported by the STAR Collaboration at the Relativistic Heavy Ion Collider (RHIC), based on the charge asymmetry dependence of the pion ${v}_{2}$ from $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=27$ to 200 GeV. In this comprehensive study, we present the STAR measurements of elliptic flow and triangular flow of charged pions, along with the ${v}_{2}$ of charged kaons and protons, as a function of charge asymmetry in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=27$, 39, 62.4, and 200 GeV. The slope parameters extracted from the linear dependence of the ${v}_{2}$ difference on charge asymmetry for different particle species are reported and compared in different centrality intervals. In addition, the slopes of ${v}_{2}$ for charged pions in small systems, i.e., $p+\mathrm{Au}$ and $d+\mathrm{Au}$ at $\sqrt{{s}_{NN}}=200$ GeV, are also presented and compared with those in large systems, i.e., $\mathrm{Au}+\mathrm{Au}$ at $\sqrt{{s}_{NN}}=200$ GeV and $\text{U}+\text{U}$ at 193 GeV. Our results provide new insights for the possible existence of the CMW and further constrain the background contributions in heavy-ion collisions at RHIC energies.

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