Deviation from Quark Number Scaling of the Anisotropy Parameter v2 of Pions, Kaons, and Protons in Au+Au Collisions at √s_NN = 200 GeV

Adare, A.; Awes, Terry C.; Cianciolo, Vince; Efremenko, Yuri V.; Read Jr, Kenneth F.; Silvermyr, David O.; Sorensen, Soren P.; Stankus, Paul W.; Young, Glenn R.; Collaboration, Phenix

doi:10.1103/PhysRevC.85.064914

Title: Deviation from Quark Number Scaling of the Anisotropy Parameter v₂ of Pions, Kaons, and Protons in Au+Au Collisions at √s_NN = 200 GeV

Journal Article · Fri Jun 01 00:00:00 EDT 2012 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.85.064914· OSTI ID:1043939

Adare, A. ^[1]; Awes, Terry C. ^[2];

^[2]; Efremenko, Yuri V. ^[2];

^[2]; Silvermyr, David O. ^[2];

^[2];

^[2]; Young, Glenn R. ^[2]; Collaboration, Phenix ^[3]

University of Colorado, Boulder
ORNL
PHENIX Collaboration

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

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1043939

Journal Information:: Physical Review C, Vol. 85, Issue 6; ISSN 0556-2813

Country of Publication:: United States

Language:: English

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Title: Deviation from Quark Number Scaling of the Anisotropy Parameter v2 of Pions, Kaons, and Protons in Au+Au Collisions at √s_NN = 200 GeV

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Title: Deviation from Quark Number Scaling of the Anisotropy Parameter v₂ of Pions, Kaons, and Protons in Au+Au Collisions at √s_NN = 200 GeV