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
,
Laurent Aphecetche
(1)
,
E. T. Atomssa
(2)
,
A. Baldisseri
(3)
,
H. Borel
(3)
,
J. L. Charvet
(3)
,
T. Dahms
(2)
,
D. d'Enterria
(2)
,
O. Drapier
(2)
,
F. Fleuret
(2)
,
M. Gonin
(2)
,
J. Gosset
(3)
,
R. Granier de Cassagnac
(2)
,
A. Hadj Henni
(1)
,
D. Jouan
(4)
,
B. Lenzi
(3)
,
M. Nguyen
(2)
,
H. Pereira
(3)
,
A. Rakotozafindrabe
(3)
,
G. Roche
(5)
,
P. Rosnet
(5)
,
C. Silvestre
(3)
,
F. Staley
(3)
,
C. Suire
(4)
,
V.-N. Tram
(2)
A. Adare
- Fonction : Auteur
Laurent Aphecetche
- Fonction : Auteur
- PersonId : 2010
- IdHAL : laurent-aphecetche
- ORCID : 0000-0001-7662-3878
- IdRef : 113847653
R. Granier de Cassagnac
- Fonction : Auteur
- PersonId : 739189
- IdHAL : raphgrandecass
- ORCID : 0000-0002-1275-7292
- IdRef : 132136651
Résumé
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%).