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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

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/20526

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

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Title: 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
Author: Fields, Douglas E.; PHENIX Collaboration; Brooks, M.L.; Butsyk, S.; Camacho, C.M.; Constantin, P.; Kapustinsky, J.; Kunde, G.J.; Lee, D.M.; Leitch, M.J.; Liu, H.; Liu, M.X.; McGaughey, P.L.; Purwar, A.K.; Sondheim, W.E.; Van Hecke, H.W.; Bassalleck, B.; Kotchetkov, D.; Malik, M.D.; Thomas, T.L.; Younus, I.
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 (|_| < 0.35) in Au+Au collisions at psNN = 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 ˇ Cerenkov 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%).
Date: 2012-05-10
Description: Preprint
URI: http://hdl.handle.net/1928/20526

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