Strange baryon resonance production in s(NN)**(1/2) = 200-GeV p+p and Au+Au collisions

The STAR collaboration
Phys.Rev.Lett. 97 (2006) 132301, 2006.

We report the measurements of $\Sigma (1385)$ and $\Lambda (1520)$ production in $p+p$ and $Au+Au$ collisions at $\sqrt{s_{NN}} = 200$ GeV from the STAR collaboration. The yields and the $p_{T}$ spectra are presented and discussed in terms of chemical and thermal freeze-out conditions and compared to model predictions. Thermal and microscopic models do not adequately describe the yields of all the resonances produced in central $Au+Au$ collisions. Our results indicate that there may be a time-span between chemical and thermal freeze-out during which elastic hadronic interactions occur.

  • Table 1

    Figure 2


    The transverse mass spectra for $\Sigma^{∗}$ and $\Lambda^{∗}$ in p+p and in central Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV....

  • Table 2

    Figure 3


    Resonance to stable particle ratios for p + p and Au + Au collisions. The ratios are normalized to unity...

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