Azimuthal anisotropy in Cu$+$Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV - INSPIRE

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Azimuthal anisotropy in Cu $+$ Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV

STAR

Collaboration

Dec 4, 2017

22 pages

Published in:

Phys.Rev.C 98 (2018) 1, 014915

Published: Aug 1, 2018

e-Print:

1712.01332 [nucl-ex]

DOI:

10.1103/PhysRevC.98.014915

Experiments:

BNL-RHIC-STAR

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Abstract: (APS)

The azimuthal anisotropic flow of identified and unidentified charged particles has been systematically studied in Cu+Au collisions at sNN=200 GeV for harmonics n=1–4 in the pseudorapidity range |η|<1. The directed flow in Cu+Au collisions is compared with the rapidity-odd and, for the first time, the rapidity-even components of charged particle directed flow in Au+Au collisions at sNN=200 GeV. The slope of the directed flow pseudorapidity dependence in Cu+Au collisions is found to be similar to that in Au+Au collisions, with the intercept shifted toward positive pseudorapidity values, i.e., the Cu-going direction. The mean transverse momentum projected onto the spectator plane 〈px〉 in Cu+Au collision also exhibits approximately linear dependence on pseudorapidity with the intercept at about η≈−0.4 (shifted from zero in the Au-going direction), closer to the rapidity of the Cu+Au system center of mass. The observed dependencies find a natural explanation in a picture of the directed flow originating partly due the “tilted source” and partly due to the asymmetry in the initial density distribution. A charge dependence of 〈px〉 was also observed in Cu+Au collisions, consistent with an effect of the initial electric field created by charge difference of the spectator protons in two colliding nuclei. The rapidity-even component of directed flow in Au+Au collisions is close to that in Pb+Pb collisions at sNN=2.76 TeV, indicating a similar magnitude of dipolelike fluctuations in the initial-state density distribution. Higher harmonic flow in Cu+Au collisions exhibits similar trends to those observed in Au+Au and Pb+Pb collisions and is qualitatively reproduced by a viscous hydrodynamic model and a multiphase transport model. For all harmonics with n≥2 we observe an approximate scaling of vn with the number of constituent quarks; this scaling works as well in Cu+Au collisions as it does in Au+Au collisions.

Note:

20 pages, 19 figures, Submitted to Phys. Rev. C

25.75.-q
25.75.Ld
flow: anisotropy
angular distribution: anisotropy
asymmetry: rapidity dependence
nucleus nucleus: scattering
hydrodynamics: viscosity
model: hydrodynamics
quark: constituent
p: spectator

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