Deviation from quark-number scaling of the anisotropy parameter $v_2$ of pions, kaons, and protons in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV - INSPIRE

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Deviation from quark-number scaling of the anisotropy parameter $v_2$ of pions, kaons, and protons in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV

PHENIX

Collaboration

•

A. Adare
(
- Colorado U.
)

Mar, 2012

16 pages

Published in:

Phys.Rev.C 85 (2012) 064914

e-Print:

1203.2644 [nucl-ex]

DOI:

10.1103/PhysRevC.85.064914

Experiments:

BNL-RHIC-PHENIX

View in:

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Abstract: (arXiv)

Measurements of the anisotropy parameter v_2 of identified hadrons (pions, kaons, and protons) as a function of centrality, transverse momentum p_T, and transverse kinetic energy KE_T at midrapidity (|\eta|<0.35) in Au+Au collisions at sqrt(s_NN) = 200 GeV are presented. Pions and protons are identified up to p_T = 6 GeV/c, and kaons up to p_T = 4 GeV/c, by combining information from time-of-flight and aerogel Cherenkov detectors in the PHENIX Experiment. The scaling of v_2 with the number of valence quarks (n_q) has been studied in different centrality bins as a function of transverse momentum and transverse kinetic energy. A deviation from previously observed quark-number scaling is observed at large values of KE_T/n_q in noncentral Au+Au collisions (20--60%), but this scaling remains valid in central collisions (0--10%).

Note:

384 authors, 16 pages, 10 figures, 3 tables. Submitted to Phys. Rev. C. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are publicly available at http://www.phenix.bnl.gov/phenix/WWW/info/data/ppg123_data.html

25.75.Dw
25.75.Ld
fermion number: scaling
Cherenkov counter: aerogel
hadron: transverse momentum
PHENIX
impact parameter
time-of-flight: detector
gold
nucleus nucleus: scattering

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