Elliptic and Hexadecapole Flow of Charged Hadrons in Au+Au Collisions at sNN=200GeV
Abstract
Differential measurements of the elliptic (v2) and hexadecapole (v4) Fourier flow coefficients are reported for charged hadrons as a function of transverse momentum (pT) and collision centrality or number of participant nucleons (Npart) for Au+Au collisions at sNN=200GeV. The v2,4 measurements at pseudorapidity |η|≤0.35, obtained with four separate reaction-plane detectors positioned in the range 1.0<|η|<3.9, show good agreement, indicating the absence of significant Δη-dependent nonflow correlations. Sizable values for v4(pT) are observed with a ratio v4(pT,Npart)/v22(pT,Npart)≈0.8 for 50≲Npart≲200, which is compatible with the combined effects of a finite viscosity and initial eccentricity fluctuations. For Npart≳200 this ratio increases up to 1.7 in the most central collisions.
- Publication:
-
Physical Review Letters
- Pub Date:
- August 2010
- DOI:
- 10.1103/PhysRevLett.105.062301
- arXiv:
- arXiv:1003.5586
- Bibcode:
- 2010PhRvL.105f2301A
- Keywords:
-
- 25.75.Dw;
- 25.75.Ld;
- Particle and resonance production;
- Collective flow;
- Nuclear Experiment
- E-Print:
- 384 authors from 64 institutions, 6 pages, 4 figures. Submitted to Physical Review Letters. v2 has minor changes in response to PRL referee comments. Plain text data tables for the points plotted in figures are at http://www.phenix.bnl.gov/papers.html