Charge-dependent anisotropic flow in Cu+Au collisions

Abstract

We present the first measurements of charge-dependent directed flow in Cu+Au collisions at t $\sqrt{s_{NN}}$ = 200 GeV. The directed flow has been measured as functions of the transverse momentum and pseudorapidity with the STAR detector. The results show a small but finite difference between positively and negatively charged particles. The difference is qualitatively explained by the patron-hadron-string-dynamics (PHSD) model including the effect of the electric field, but much smaller than the model calculation, which indicates only a small fraction of all final quarks are created within the lifetime of the initial electric field. Higher-order azimuthal anisotropic flow is also presented up to the fourth-order for unidentified charged particles and up to the third-order for identified charged particles (π, K, and p). For unidentified particles, the results are reasonably described by the event-by-event viscous hydrodynamic model with η/s=0.08-0.16. The trends observed for identified particles in Cu+Au collisions are similar to those observed in symmetric (Au+Au) collisions.

4 pages, 5 figures, Proceedings of Quark Matter 2015, Kobe, Japan (Sep.27-Oct.3, 2015)

References in corpus (4)

• Third Harmonic Flow of Charged Particles in Au+Au Collisions at sqrtsNN = 200 GeV
• Estimation of electric conductivity of the quark gluon plasma via asymmetric heavy-ion collisions
• Charge-dependent directed flow in asymmetric nuclear collisions
• Event-by-event viscous hydrodynamics for Cu-Au collisions at 200GeV

Cited by in corpus (4)

• Electromagnetic fields and directed flow in large and small colliding systems at ultrarelativistic energies
• Ultra-relativistic nuclear collisions: where the spectators flow?
• Directed flow in asymmetric nucleus-nucleus collisions and the inverse Landau-Pomeranchuk-Migdal effect
• Quark and Gluon Production from a Boost-invariantly Expanding Color Electric Field