Interpreting the charge-dependent flow and constraining the chiral magnetic wave with event shape engineering

Abstract

The charge asymmetry (Ach) dependence of anisotropic flow serves as an important tool to search for the chiral magnetic wave (CMW) in heavy-ion collisions. However, the background effect, such as the local charge conservation (LCC) entwined with collective flow, has not yet been unambiguously eliminated in the measurement. With the help of two models, the AMPT with initial quadrupole moment and the blast wave (BW) incorporating LCC, we discuss the features of the LCC-induced and the CMW-induced correlations between Ach and the flow. More importantly, we first propose to use the Event Shape Engineering (ESE) technique to distinguish the background and the signal for the CMW study. This method would be highly desirable in the experimental search for the CMW and provides more insights for understanding the charge-dependent collective motion of the quark-gluon plasma.

7 pages, 5 figures

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• Effects of the $\alpha$-cluster structure and the intrinsic momentum component of nuclei on the longitudinal asymmetry in relativistic heavy-ion collisions
• Search for the chiral magnetic wave using anisotropic flow of identified particles at RHIC
• Probing the Chiral Magnetic Wave with charge-dependent flow measurements in Pb-Pb collisions at the LHC
• External magnetic field induced paramagnetic squeezing effect in heavy-ion collisions at the LHC
• Search for the Chiral Magnetic Wave in Pb--Pb collisions using the ALICE detector