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Deviation from quark number scaling of the anisotropy parameter v2 of pions, kaons, and protons in Au+Au collisions at √sNN=200 GeV

Abstract : Measurements of the anisotropy parameter v2 of identified hadrons (pions, kaons, and protons) as a function of centrality, transverse momentum pT, and transverse kinetic energy KET at midrapidity (|η|<0.35) in Au + Au collisions at √sNN=200 GeV are presented. Pions and protons are identified up to pT= 6 GeV/c, and kaons up to pT= 4 GeV/c, by combining information from time-of-flight and aerogel Čerenkov detectors in the PHENIX Experiment. The scaling of v2 with the number of valence quarks (nq) 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 KET/nq in noncentral Au + Au collisions (20-60%), but this scaling remains valid in central collisions (0-10%).
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http://hal.in2p3.fr/in2p3-00724075
Contributor : Sophie Heurteau <>
Submitted on : Friday, August 17, 2012 - 10:43:02 AM
Last modification on : Thursday, February 25, 2021 - 10:58:20 AM

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A. Adare, Laurent Aphecetche, E. T. Atomssa, A. Baldisseri, H. Borel, et al.. Deviation from quark number scaling of the anisotropy parameter v2 of pions, kaons, and protons in Au+Au collisions at √sNN=200 GeV. Physical Review C, American Physical Society, 2012, 85, pp.064914. ⟨10.1103/PhysRevC.85.064914⟩. ⟨in2p3-00724075⟩

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