The back-to-back relative OS/SS pair excess r_BB(ϕ_BB) is sensitive to the chiral magnetic effect and far less affected by resonance-decay backgrounds than the standard Δγ observable.
Challenges in flow background removal in search for the chiral magnetic effect
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abstract
We investigate the effect of resonance decays on the three-particle correlator charge separation observable in search for the chiral magnetic effect, using a simple simulation with realistic inputs. We find that resonance decays can largely account for the measured signal. We suppress the elliptic flow ($v_2$) background by using zero event-by-event $v_2$ (or via the mixed-event technique). We find that the background is suppressed, but not eliminated as naively anticipated. We identify the reason to be the non-identicalness of the resonance and final-state particle's $v_2$ and the induced correlation between the transverse momentum dependent resonance $v_2$ and decay angle. We make predictions for the charge separation signal due to resonance decays in 200~GeV Au+Au collisions.
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Back-to-back relative-excess observable in search for the chiral magnetic effect
The back-to-back relative OS/SS pair excess r_BB(ϕ_BB) is sensitive to the chiral magnetic effect and far less affected by resonance-decay backgrounds than the standard Δγ observable.