Deviation from quark number scaling of the anisotropy parameter v 2 of pions, kaons, and protons in Au+Au collisions at √s NN=200 GeV

L. Baksay, Awadhesh Kumar Dubey, Mihael Makek, Alexander Milov, Deepali Sharma, Itzhak Tserruya,

Research output: Contribution to journalArticlepeer-review

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%).

Original languageEnglish
Article number064914
JournalPhysical Review C
Volume85
Issue number6
DOIs
StatePublished - 25 Jun 2012

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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