Estimate of the CME signal in heavy-ion collisions from measurements relative to the participant and spectator flow planes

Abstract

An interpretation of the charge dependent correlations sensitive to the Chiral Magnetic Effect (CME) -- the separation of the electric charges along the system magnetic field (across the reaction plane) -- is ambiguous due to a possible large background (non-CME) effects. The background contribution is proportional to the elliptic flow $v_2$; it is the largest in measurements relative to the participant plane, and is smaller in measurements relative to the flow plane determined by spectators, where the CME signal, on opposite, is likely larger. In this note I discuss a possible strategy for corresponding experimental measurements, and list and evaluate different assumptions related to this approach.

Latex, 7 pages

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• Impact of magnetic-field fluctuations on measurements of the chiral magnetic effect in collisions of isobaric nuclei
• Implications of the isobar run results for chiral magnetic effect in heavy ion collisions
• Chiral Magnetic Effect in Heavy Ion Collisions: The Present and Future
• Search for the Chiral Magnetic Effect in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}=27$ GeV with the STAR forward Event Plane Detectors
• A sensitivity study of the primary correlators used to characterize chiral-magnetically-driven charge separation
• The BEST framework for the search for the QCD critical point and the chiral magnetic effect
• Collective Excitation in High-Energy Nuclear Collisions -- In Memory of Professor Lianshou Liu
• Elliptic flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb and Xe-Xe collisions
• Accessing Topological Fluctuations of Gauge Fields with Chiral Magnetic Effect
• Experimental review on the chiral magnetic effect in relativistic heavy ion collisions
• Search for the chiral magnetic effect through beam energy dependence of charge separation using event shape selection
• Influence of the chiral magnetic effect on particle-pair elliptic anisotropy
• Investigating event-shape methods in the search for the chiral magnetic effect in relativistic heavy ion collisions