Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

6-25-2012

Journal or Book Title

Physical Review C

Volume

85

Issue

6

First Page

064914

DOI

10.1103/PhysRevC.85.064914

Abstract

Measurements of the anisotropy parameter v(2) of identified hadrons (pions, kaons, and protons) as a function of centrality, transverse momentum p(T), and transverse kinetic energy KET at midrapidity (vertical bar eta vertical bar < 0.35) in Au + Au collisions at root s(N N) = 200 GeV are presented. Pions and protons are identified up to p(T) = 6 GeV/c, and kaons up to p(T) = 4 GeV/c, by combining information from time-of-flight and aerogel Cerenkov detectors in the PHENIX Experiment. The scaling of v(2) with the number of valence quarks (n(q)) 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/n(q) in noncentral Au + Au collisions (20-60%), but this scaling remains valid in central collisions (0-10%).

Comments

This is an article from Physical Review C 85 (2012): 064914-1, doi:10.1103/PhysRevC.85.064914. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

Included in

Nuclear Commons

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