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

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. C 85, 064914 – Published 25 June 2012

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 (2060%), but this scaling remains valid in central collisions (010%).

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  • Received 12 March 2012

DOI:https://doi.org/10.1103/PhysRevC.85.064914

©2012 American Physical Society

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Vol. 85, Iss. 6 — June 2012

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