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We investigate the effect of resonance decays on the three-particlecorrelator charge separation observable in search for the chiral magneticeffect, using a simple simulation with realistic inputs. We find that resonancedecays can largely account for the measured signal. We suppress the ellipticflow ($v_2$) background by using zero event-by-event $v_2$ (or via themixed-event technique). We find that the background is suppressed, but noteliminated as naively anticipated. We identify the reason to be thenon-identicalness of the resonance and final-state particle's $v_2$ and theinduced correlation between the transverse momentum dependent resonance $v_2$and decay angle. We make predictions for the charge separation signal due toresonance decays in 200~GeV Au+Au collisions.

Challenges in flow background removal in search for the chiral magnetic effect