Particle-Type Dependence of Azimuthal Anisotropy and Nuclear Modification of Particle Production in Au + Au Collisions at √SNN= 200 GeV

STAR Collaboration

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We present STAR measurements of the azimuthal anisotropy parameter ν2 and the binary-collision scaled centrality ratio RCP for kaons and lambdas (Λ + Λ) at midrapidity in Au + Au collisions at √sNN = 200 GeV. In combination, the ν2 and RCP particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation in vacuum We establish pT ≈ 5 GeV/c as the value where the centrality dependent baryon enhancement ends. The K0 and Λ + Λ¯ ν2 values are consistent with expectations of constituent-quark-number scaling from models of hadron formation by parton coalescence or recombination.

Original languageEnglish (US)
Article number052302
Pages (from-to)523021-523026
Number of pages6
JournalPhysical Review Letters
Issue number5
StatePublished - Feb 6 2004


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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