Spectator induced electromagnetic effect on directed flow in heavy ion collisions

Abstract

We estimate the electromagnetic effect of the spectator charge on azimuthal anisotropies observed in heavy ion collisions. For peripheral Pb+Pb reactions at the top energy of the CERN Super Proton Synchrotron, $\sqrt{s_{NN}}=17.3$ GeV, we predict this effect to bring very large distortions to the observed directed flow, $v_1$, of positive and negative pions emitted close to beam rapidity. The overall magnitude of this effect is comparable to values of $v_1$ reported by the WA98 experiment. We argue that also at lower rapidities, the spectator induced electromagnetic effect may result in the splitting of values of $v_1$ observed for positive and negative pions. Such a splitting is visible in the data reported by the STAR Collaboration from the RHIC Beam Energy Scan. Both effects are sensitive to the space-time scenario assumed for pion emission. Therefore, they bring new information on the collision dynamics.

14 pages, 5 figures

References in corpus (5)

• Transverse momentum analysis of collective motion in relativistic nuclear collisions
• Directed flow in ultrarelativistic heavy-ion collisions
• System-size independence of directed flow at the Relativistic Heavy-Ion Collider
• New method for measuring longitudinal fuctuations and directed flow in ultrarelativistic heavy ion reactions
• The Spectator Electromagnetic Effect on Charged Pion Spectra in Peripheral Ultrarelativistic Heavy-Ion Collisions

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