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The chiral magnetic effect (CME) refers to charge separation along a strongmagnetic field between left- and right-handed quarks, caused by interactionswith topological gluon fields from QCD vacuum fluctuations. We present twoapproaches to handle the dominant elliptic flow ($v_2$) background in thethree-particle correlator ($\Delta\gamma_{112}$), sensitive to CME. In thefirst approach, we present the $\Delta\gamma_{112}$ and $\Delta\gamma_{123}$measurements in U+U and Au+Au collisions. While hydrodynamic simulationsincluding resonance decays and local charge conservation predict that$\Delta\gamma_{112}$ scaled by $N_{\rm part}/v_2$ will be similar in U+U andAu+Au collisions, the projected B-field exhibits a distinct difference betweenthe two systems and with varying $N_{\rm part}$. Therefore, U+U and Au+Aucollisions provide configurations with different expectations for both CMEsignal and background. Moreover, the three-particle observable$\Delta\gamma_{123}$ scaled by $N_{\rm part}/v_3$ provide baseline measurementfor only the background. In the second approach, we handle the $v_2$ backgroundby measuring $\Delta\gamma_{112}$ with respect to the planes of spectatorsmeasured by Zero Degree Calorimeters and participants measured by TimeProjection Chamber. These measurements contain different amounts ofcontributions from CME signal (along B-field, due to spectators) and $v_2$background (determined by the participant geometry). With the two$\Delta\gamma_{112}$ measurements, the possible CME signal and the backgroundcontribution can be determined. We report such a measurement in Au+Aucollisions at $\sqrt{s_{NN}}=$ 27 GeV with the newly installed event planedetector, and report the new findings in U+U system where thespectator-participant plane correlations are expected to differ from those inAu+Au collisions.

Search for CME in U+U and Au+Au collisions in STAR with different approaches of handling backgrounds