Scaling Properties of Hyperon Production in Au+Au Collisions at s**(1/2) = 200-GeV

The STAR collaboration
Phys.Rev.Lett. 98 (2007) 062301, 2007.

Abstract (data abstract)
We present the scaling properties of $\Lambda$, $\Xi$, $\Omega$ and their anti-particles produced at mid-rapidity in Au+Au collisions at RHIC at $\sqrt{s_{NN}}$ = 200 GeV. The yield of multi-strange baryons per participant nucleon increases from peripheral to central collisions more rapidly than the $\Lambda$ yield, which appears to correspond to an increasing strange quark density of matter produced. The value of the strange phase space occupancy factor $\gamma_{s}$, obtained from a thermal model fit to the data, approaches unity for the most central collisions. We also show that the nuclear modification factors, $R_{CP}$, of $\Lambda$ and $\Xi$ are consistent with each other and with that of protons in the transverse momentum range 2.0 < $p_{T}$ < 5.0 GeV/c. This scaling behaviour is consistent with a scenario of hadron formation from constituent quark degrees of freedom through quark recombination or coalescence.

  • Figure 1 a

    Data from Figure 1 a

    10.17182/hepdata.98928.v1/t1

    Transverse momentum distributions of (a) $\Lambda(\overline{\Lambda})$ for $|y|<1.0$, (b) $\Xi^{-}(\overline{\Xi}^{+})$ for $|y|<0.75$ and (c) $\Omega^{-}+\overline{\Omega}^{+}$ for $|y|<0.75$ in Au+Au collisions...

  • Figure 1 b

    Data from Figure 1 b

    10.17182/hepdata.98928.v1/t2

    Transverse momentum distributions of (a) $\Lambda(\overline{\Lambda})$ for $|y|<1.0$, (b) $\Xi^{-}(\overline{\Xi}^{+})$ for $|y|<0.75$ and (c) $\Omega^{-}+\overline{\Omega}^{+}$ for $|y|<0.75$ in Au+Au collisions...

  • Figure 1 c

    Data from Figure 1 c

    10.17182/hepdata.98928.v1/t3

    Transverse momentum distributions of (a) $\Lambda(\overline{\Lambda})$ for $|y|<1.0$, (b) $\Xi^{-}(\overline{\Xi}^{+})$ for $|y|<0.75$ and (c) $\Omega^{-}+\overline{\Omega}^{+}$ for $|y|<0.75$ in Au+Au collisions...

  • Figure 2 up

    Data from Figure 2 up

    10.17182/hepdata.98928.v1/t4

    (a) The corrected integrated yield $dN/dy$ at mid-rapidity for $\overline{\Xi}^{+}$ , $\overline{\Lambda}$ and $\overline{p}$ divided by $N_{part}$, normalized to the...

  • Figure 2 down

    Data from Figure 2 down

    10.17182/hepdata.98928.v1/t5

    (a) The corrected integrated yield $dN/dy$ at mid-rapidity for $\overline{\Xi}^{+}$ , $\overline{\Lambda}$ and $\overline{p}$ divided by $N_{part}$, normalized to the...

  • Figure 3

    Data from Figure 3

    10.17182/hepdata.98928.v1/t6

    $R_{CP}$ for $\Xi^{-}+\overline{\Xi}^{+}$ and $\Omega^{-}+\overline{\Omega}^{+}$ at mid-rapidity (centrality interval : 0 − 5% vs. 40 − 60%). A dashed line...

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