Charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV

Abstract

We present the first measurement of charge-dependent directed flow in Cu+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV. The results are presented as a function of the particle transverse momentum and pseudorapidity for different centralities. A finite difference between the directed flow of positive and negative charged particles is observed that qualitatively agrees with the expectations from the effects of the initial strong electric field between two colliding ions with different nuclear charges. The measured difference in directed flow is much smaller than that obtained from the parton-hadron-string-dynamics (PHSD) model, which suggests that most of the electric charges, i.e. quarks and antiquarks, have not yet been created during the lifetime of the strong electric field, which is of the order of, or less than, 1fm/$c$.

8 pages, 4 figures, Accepted for publication in Phys. Rev. Lett

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• Chiral Magnetic Wave
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Cited by in corpus (9)

• The ALICE experiment: a journey through QCD
• Experimental searches for the chiral magnetic effect in heavy-ion collisions
• Chiral Magnetic Effects in Nuclear Collisions
• Charge-dependent flow as evidence of strong electromagnetic fields in heavy-ion collisions
• Hyperon polarization and its relation with directed flow in high-energy nuclear collisions
• Pion, kaon, and (anti-)proton production in U+U Collisions at $\sqrt{s_{NN}}$ = 193 GeV measured with the STAR detector
• Highlights from STAR heavy ion program
• Estimation of electric field in intermediate-energy heavy-ion collisions
• Testing the impact of electromagnetic fields on the directed flow of constituent quarks in heavy-ion collisions