Charged elliptic flow at zero charge asymmetry

Abstract

The difference between the flow ellipticities of oppositely charged pions, Δv_2=v_2[π-]-v_2[π+], measured recently by STAR collaboration at RHIC shows a linear dependence on the event charge asymmetry A_+-={(N_+-N_-)/ (N_++N_-)}: Δv_2(A_+-)= Δv_2(0)+ r A_+- with a slope r>0 and a non-zero intercept Δv_2(0)>0 of order 10^{-4}. We point out two novel mechanisms which could explain the non-zero value of the charged elliptic flow Δv_2 at zero charge asymmetry A_+-=0, i.e., the non-zero positive intercept Δv_2(0). Both effects are due to the electric fields created by the colliding ions. These fields have quadrupole asymmetry of the magnitude and the sign needed to account for the nonzero intercept Δv_2(0) in the RHIC data. One of the mechanisms also involves chiral magnetic effect. This mechanism, although negligible at RHIC energies, may become important at LHC energies.

11 pages, 4 figures

References in corpus (5)

• The Chiral Magnetic Effect
• Chiral Magnetic Wave
• Quantum Anomalies in Dense Matter
• Contributions to the event-by-event charge asymmetry dependence for the elliptic flow of pi^{+} and pi^{-} in heavy-ion collisions
• From the chiral magnetic wave to the charge dependence of elliptic flow

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• Elliptic flow difference of charged pions in heavy-ion collisions
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• Chiral magnetic effect in the hadronic phase
• Applying Deep Learning Technique to Chiral Magnetic Wave Search
• The Chrial Magnetic Wave and Strong Field Effects in Heavy Ion Collisions