Centrality dependence of charged hadron and strange hadron elliptic flow from {radical}(s{sub NN})=200 GeV Au+Au collisions

Journal Article · Thu May 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.054901· OSTI ID:21190003

Abelev, B I; Barannikova, O; Betts, R R; Callner, J; Garcia-Solis, E; Hofman, D J; Hollis, R S; Iordanova, A; Suarez, M C ^[1]; Aggarwal, M M; Bhati, A K; Kumar, A; Kumar, L; Pruthi, N K ^[2]; Ahammed, Z; Chattopadhyay, S; Mazumdar, M R. Dutta; Ganti, M S; Ghosh, P; Mohanty, B ^[3]

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1. University of Illinois at Chicago, Chicago, Illinois 60607 (United States)
2. Panjab University, Chandigarh 160014 (India)
3. Variable Energy Cyclotron Centre, Kolkata 700064 (India)

We present STAR results on the elliptic flow v{sub 2} of charged hadrons, strange and multistrange particles from {radical}(s{sub NN})=200 GeV Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The detailed study of the centrality dependence of v{sub 2} over a broad transverse momentum range is presented. Comparisons of different analysis methods are made in order to estimate systematic uncertainties. To discuss the nonflow effect, we have performed the first analysis of v{sub 2} with the Lee-Yang zero method for K{sub S}{sup 0} and {lambda}. In the relatively low p{sub T} region, p{sub T}{<=}2 GeV/c, a scaling with m{sub T}-m is observed for identified hadrons in each centrality bin studied. However, we do not observe v{sub 2}(p{sub T}) scaled by the participant eccentricity to be independent of centrality. At higher p{sub T},2{<=}p{sub T}{<=}6 GeV/c,v{sub 2} scales with quark number for all hadrons studied. For the multistrange hadron {omega}, which does not suffer appreciable hadronic interactions, the values of v{sub 2} are consistent with both m{sub T}-m scaling at low p{sub T} and number-of-quark scaling at intermediate p{sub T}. As a function of collision centrality, an increase of p{sub T}-integrated v{sub 2} scaled by the participant eccentricity has been observed, indicating a stronger collective flow in more central Au+Au collisions.

• OSTI ID: 21190003
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 77, Issue 5; Other Information: DOI: 10.1103/PhysRevC.77.054901; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ATOM-ATOM COLLISIONS
BNL
BROOKHAVEN RHIC
COLLISIONS
COMPARATIVE EVALUATIONS
DATA COVARIANCES
FUNCTIONS
GEV RANGE 100-1000
HADRONS
INTERACTIONS
PARTICLES
QUARKS
SCALING
STARS
TRANSVERSE MOMENTUM