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Physical Review C 85 (2012) 064914
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, L. Aphecetche1, E. T. Atomssa2, A. Baldisseri3, H. Borel3, J. L. Charvet3, T. Dahms2, D. d'Enterria2, O. Drapier2, F. Fleuret2, M. Gonin2, J. Gosset3, R. Granier de Cassagnac2, A. Hadj Henni1, D. Jouan4, B. Lenzi3, M. Nguyen2, H. Pereira3, A. Rakotozafindrabe3, G. Roche5, P. Rosnet5, C. Silvestre3, F. Staley3, C. Suire4, V.-N. Tram2
PHENIX Collaboration(s)
(2012)

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%).
1 :  SUBATECH - Laboratoire SUBATECH Nantes
2 :  LLR - Laboratoire Leprince-Ringuet
3 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
4 :  IPNO - Institut de Physique Nucléaire d'Orsay
5 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
Physique/Physique des Hautes Energies - Expérience

Physique/Physique Nucléaire Expérimentale
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1203.2644