Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at s(NN) = 200-GeV - INSPIRE

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Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at s(NN) = 200-GeV

PHENIX

Collaboration

Aug, 2006

6 pages

Published in:

Phys.Rev.Lett. 98 (2007) 162301

e-Print:

nucl-ex/0608033 [nucl-ex]

DOI:

10.1103/PhysRevLett.98.162301

Experiments:

BNL-RHIC-PHENIX

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Abstract:

Detailed differential measurements of the elliptic flow for particles produced in Au+Au and Cu+Cu collisions at sqrt(s_NN) = 200 GeV are presented. Predictions from perfect fluid hydrodynamics for the scaling of the elliptic flow coefficient v_2 with eccentricity, system size and transverse energy are tested and validated. For transverse kinetic energies KE_T ~ m_T-m up to ~1 GeV, scaling compatible with the hydrodynamic expansion of a thermalized fluid is observed for all produced particles. For large values of KE_T, the mesons and baryons scale separately. A universal scaling for the flow of both mesons and baryons is observed for the full transverse kinetic energy range of the data when quark number scaling is employed. In both cases the scaling is more pronounced in terms of KE_T rather than transverse momentum.

Note:

422 authors from 58 institutions, 6 pages, 3 figures. Submitted to Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

25.75.Dw
nucleus nucleus: colliding beams
scattering: heavy ion
gold
copper
hadron: multiple production
elliptic flow
transverse momentum dependence
hydrodynamics
scaling

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