Deviation from quark-number scaling of the anisotropy parameter v2 of pions, kaons, and protons in Au+Au collisions at sqrt(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 sqrt(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 Cherenkov 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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