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The scaling properties of the $\Delta\gamma$ correlator, inferred from theAnomalous Viscous Fluid Dynamics (AVFD) model, are used to investigate apossible chiral-magnetically-driven (CME) charge separation in $p$+Au, $d$+Au,Ru+Ru, Zr+Zr, and Au+Au collisions at $\sqrt s_{\mathrm{NN}}=200$ GeV, and in$p$+Pb ($\sqrt s_{\mathrm{NN}}=5.02$ TeV) and Pb+Pb collisions at $\sqrts_{\mathrm{NN}}=5.02$ and $2.76$ TeV. The results indicate that the values ofthe quotient $\Delta\gamma/v_2$ with the elliptic flow coefficient $v_2$ for$p$+Au, $d$+Au, $p$+Pb, and Pb+Pb collisions, scale as $1/{\rm N_{ch}}$consistent with background-driven charge separation. By contrast, the$\Delta\gamma/v_2$ values for Ru+Ru, Zr+Zr, and Au+Au collisions show scalingviolations consistent with the presence of background plus a CME-drivencontribution. Quantifying this CME-driven component indicates that inmid-central collisions, the fraction of the measured $\Delta\gamma/v_2$attributable to the CME is approximately 27\% for Au+Au and roughly a factor oftwo smaller for Ru+Ru and Zr+Zr, which show similar magnitudes.

Scaling properties of the $\Delta\gamma$ correlator and their implication for detection of the chiral magnetic effect in heavy-ion collisions