  Chiral Magnetic Effect (CME) is a phenomenon in which electric charge is
separated by a strong magnetic field from local domains of chirality imbalance
in quantum chromodynamics. The CME-sensitive, azimuthal correlator difference
$\Delta\gamma$ between opposite-sign (OS) and same-sign (SS) charged hadron
pairs is contaminated by a major physics background proportional to the
particle elliptic anisotropy ($v_2$). The CME signal, on the other hand,
contributes to the difference in the pair elliptic anisotropies between OS and
SS pairs ($\Delta v_{2,\rm pair}$). We investigate $\Delta v_{2,\rm pair}$ and
found its sensitivity to CME to be similar to that of the $\Delta\gamma$
observable.
