Particle-type dependence of azimuthal anisotropy and nuclearmodification of particle production in Au+Au collisions at sNN = 200GeV
We present STAR measurements of the azimuthal anisotropy parameter v{sub 2} and the binary-collision scaled centrality ratio R{sub CP} for kaons and lambdas ({Lambda} + {bar {Lambda}}) at mid-rapidity in Au+Au collisions at {radical}s{sub NN} = 200 GeV. In combination, the v{sub 2} and R{sub CP} particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation in vacuum. We establish p{sub T} {approx} 5 GeV/c as the value where the centrality dependent baryon enhancement ends. The K{sub S}{sup 0} and {Lambda} + {bar {Lambda}} v{sub 2} values are consistent with expectations of constituent-quark-number scaling from models of hadron formation by parton coalescence or recombination.
- Research Organization:
- COLLABORATION - U. ofBirmingham/UK
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 891810
- Report Number(s):
- LBNL-55274; PRLTAO; R&D Project: NRNC; BnR: KB0201022; TRN: US0605494
- Journal Information:
- Physical Review Letters, Vol. 92; Related Information: Journal Publication Date: 02/23/2004; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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