Identified charged particle azimuthal anisotropy in PHENIX at RHIC

ShinIchi Esumi

doi:10.1016/S0375-9474(02)01541-5

paper

Identified charged particle azimuthal anisotropy in PHENIX at RHIC

arXiv:nucl-ex/0210012 · doi:10.1016/S0375-9474(02)01541-5

Abstract

We present here v $_{2}$ of identified and inclusive charged particles measured in the PHENIX central arm detector ( $∣ η ∣ < 0.35$ ) with respect to the reaction plane defined at $∣ η ∣ = 3 \sim 4$ in 200 GeV Au+Au collisions. We find that v $_{2}$ increases from central to mid-central collisions reaching a maximum at about 50% of the geometric cross section and then decreases again for more peripheral collisions. As a function of transverse momentum in minimum-bias collisions, the v $_{2}$ parameter increases linearly with p $_{T}$ up to p $_{T}$ $≃$ 2 GeV/c and then saturates for inclusive charged particles. The v $_{2}$ parameter of identified particles ( $π^{+}$ , $π^{-}$ , $K^{+}$ , $K^{-}$ , $p$ and $p ˉ$ ) follow a hydro-dynamic behavior up to 2 GeV/c in p $_{T}$ , where the lighter mass particles have larger v $_{2}$ at a given p $_{T}$ . However there is an indication that this trend is reversed at around p $_{T}$ $≃$ 2 GeV/c, where $p$ and $p ˉ$ have larger v $_{2}$ than $π$ and $K$ .

4 pages, 4 figures. Talk presented at Quark Matter 2002, Nantes, France, July 18-24, 2002. To appear in the proceedings (Nucl. Phys. A)

Identified charged particle azimuthal anisotropy in PHENIX at RHIC

Abstract

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