Influence of the chiral magnetic effect on particle-pair elliptic anisotropy

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 $\mathrm{\Delta }\gamma$ 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 ($\mathrm{\Delta }{v}_{2,\mathrm{p}\mathrm{a}\mathrm{i}\mathrm{r}}$). We investigate $\mathrm{\Delta }{v}_{2,\mathrm{p}\mathrm{a}\mathrm{i}\mathrm{r}}$ and found its sensitivity to CME to be similar to that of the $\mathrm{\Delta }\gamma$ observable.