Particle type dependence of azimuthal anisotropy and nuclear modification of particle production in Au + Au collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.Lett. 92 (2004) 052302, 2004.

Abstract
We present STAR measurements of the azimuthal anisotropy parameter $v_2$ and the binary-collision scaled centrality ratio $R_{CP}$ for kaons and lambdas ($\Lambda+\bar{\Lambda}$) at mid-rapidity in Au+Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. In combination, the $v_2$ and $R_{CP}$ particle-type dependencies contradict expectations from partonic energy loss followed by standard fragmentation in vacuum. We establish $p_T \approx 5$ GeV/c as the value where the centrality dependent baryon enhancement ends. The $K_S^0$ and $\Lambda+\bar{\Lambda}$ $v_2$ values are consistent with expectations of constituent-quark-number scaling from models of hadron fromation by parton coalescence or recombination.

  • Table 1.1

    10.17182/hepdata.93260.v1/t1

    The minimum bias (0-80% of the collision cross-section) v2(pT) of K0s. Errors listed include statistical and point-to-point systematic uncertainties from...

  • Table 1.2

    10.17182/hepdata.93260.v1/t2

    The minimum bias (0-80% of the collision cross-section) v2(pT) of Lambda+Lambdabar. Errors listed include statistical and point-to-point systematic uncertainties from...

  • Table 1.3

    10.17182/hepdata.93260.v1/t3

    The minimum bias (0-80% of the collision cross-section) v2(pT) of charged hadrons. Errors listed include statistical and point-to-point systematic uncertainties...

  • Table 2.1

    10.17182/hepdata.93260.v1/t4

    The v2 of KS0 as a function of pT for 30%–70%, 5%–30%, and 0%–5% of the collision cross section. The...

  • Table 2.2

    10.17182/hepdata.93260.v1/t5

    The v2 of Lambda+Lambdabar as a function of pT for 30%–70%, 5%–30%, and 0%–5% of the collision cross section. The...

  • Table 3.1

    10.17182/hepdata.93260.v1/t6

    The ratio RCP for KS0 at midrapidity calculated using centrality intervals, 0%–5% vs 40%–60% and 0%–5% vs 60%–80% of the...

  • Table 3.2

    10.17182/hepdata.93260.v1/t7

    The ratio RCP for Lambda+Lambdabar at midrapidity calculated using centrality intervals, 0%–5% vs 40%–60% and 0%–5% vs 60%–80% of the...

  • Table 4.1

    10.17182/hepdata.93260.v1/t8

    The v2 parameter for KS0 scaled by the number of constituent quarks (n) and plotted versus pT/n. The error bars...

  • Table 4.2

    10.17182/hepdata.93260.v1/t9

    The v2 parameter for Lambda+Lambdabar scaled by the number of constituent quarks (n) and plotted versus pT/n. The error bars...

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