Directed flow in asymmetric nucleus-nucleus collisions and the inverse Landau-Pomeranchuk-Migdal effect

Abstract

It is proposed to identify a strong electric field - created during relativistic collisions of asymmetric nuclei - via the observation of pseudorapidity and transverse momentum distributions of hadrons with the same mass but opposite charge. The results of detailed calculations within the Parton-Hadron String Dynamics (PHSD) approach for the charge-dependent directed flow $v_1$ are presented for semi-central Cu+Au collision at $\sqrt{s_{NN}}=200$ GeV incorporating the inverse Landau-Pomeranchuk-Migdal (iLPM) effect, which accounts for a delay in the electromagnetic interaction with the charged degree of freedom. Including the iLPM effect we achieve a reasonable agreement of the PHSD results for the charge splitting in $v_1(p_T)$ in line with the recent measurements of the STAR Collaboration for Cu+Au collisions at $\sqrt{s_{NN}}=200$ GeV while an instant appearance and coupling of electric charges at the hard collision vertex overestimates the splitting by about a factor of 10. We predict that the iLPM effect should practically disappear at energies of $\sqrt{s_{NN}}\approx$9 GeV, which should lead to a significantly larger charge splitting of $v_1$ at the future FAIR/NICA facilities.

5 pages, 6 figures

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• Charge-dependent directed flow in asymmetric nuclear collisions
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• Charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Evidence for creation of strong electromagnetic fields in relativistic heavy-ion collisions
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• Proton-proton, pion-proton and pion-pion diffractive collisions at ultra-high energies

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• Influence of electromagnetic fields in proton-nucleus collisions at relativistic energy
• The effect of internal magnetic field on collective flow in heavy ion collisions at intermediate energies
• Testing the impact of electromagnetic fields on the directed flow of constituent quarks in heavy-ion collisions
• Electric-charge-dependent directed flow splitting of produced quarks in Au+Au collisions