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Enhanced strange baryon production in Au+Au collisions compared to p+p at sNN=200 GeV

B. I. Abelev et al. (STAR Collaboration)
Phys. Rev. C 77, 044908 – Published 24 April 2008
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  • INTRODUCTION
  • ANALYSIS
  • RESULTS
  • SUMMARY AND CONCLUSIONS
  • ACKNOWLEDGEMENTS
    • References

    Abstract

    We report on the observed differences in production rates of strange and multistrange baryons in Au+Au collisions at sNN=200 GeV compared to p+p interactions at the same energy. The strange baryon yields in Au+Au collisions, when scaled down by the number of participating nucleons, are enhanced relative to those measured in p+p reactions. The enhancement observed increases with the strangeness content of the baryon, and it increases for all strange baryons with collision centrality. The enhancement is qualitatively similar to that observed at the lower collision energy sNN=17.3 GeV. The previous observations are for the bulk production, while at intermediate pT,1<pT<4 GeV/c, the strange baryons even exceed binary scaling from p+p yields.

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    • Received 17 May 2007

    DOI:https://doi.org/10.1103/PhysRevC.77.044908

    ©2008 American Physical Society

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    Vol. 77, Iss. 4 — April 2008

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    Images

    • Figure 1
      Figure 1

      Midrapidity E(i) as a function of 〈Npart〉 for Λ,Λ¯ (|y|<1.0), Ξ−,Ξ¯+,Ω−+Ω¯+ (|y|<0.75), and inclusive p (|y|<0.5). Boxes at unity show statistical and systematic uncertainties combined in the p+p (p+Be) data. Error bars on the data points represent those from the heavy ions. The solid markers are for Au+Au at sNN=200 GeV and the open symbols for Pb+Pb (|y|<0.5) at sNN=17.3 GeV [4]. The arrows on the right axes mark the predictions from a GC formalism model when varying T from 165 MeV [E(Ξ−)=10.7,E(Λ)=2.6] to 170 MeV [E(Ξ−)=7.5,E(Λ)=2.2]. The red arrows indicate the predictions for Ξ and the black arrows those for Λ, see text for details [12].

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    • Figure 2
      Figure 2

      RAA from (a) 0−5% and (b) 60−80% central Au+Au events for p+p¯ [18, 19], Λ, and Ξ−+Ξ¯+. Errors shown are statistical plus systematic added in quadrature. The band at unity shows the systematic uncertainty on 〈Nbin〉. The dashed line below unity shows the expected value of RAA should the yields scale with 〈Npart〉, and the band around it shows the systematic uncertainty on 〈Npart〉.

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    • Figure 3
      Figure 3

      RCP Au+Au events for p+p¯(0−12%/60−80%) [19], and Λ+Λ¯ and Ξ−+Ξ¯+(0−5%/60−80%) [5]. Also shown as the dashed curve are the results for 4h++h− for 0−5%/60−80% [20]. Errors shown are statistical plus systematic added in quadrature. The band at unity shows the systematic uncertainty on 〈Nbin〉. The dashed line below unity shows the expected value of RCP should the yields scale with 〈Npart〉, and the band around it shows the systematic uncertainty on 〈Npart〉.

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    • Figure 4
      Figure 4

      Comparison of RAA from data to HIJING [26] and EPOS [29] for 0−5% and 60−80% most central Au+Au collisions, for p+p¯,Λ, and Ξ−+Ξ¯+. Errors shown are statistical plus systematic added in quadrature. The bands at unity shows the systematical uncertainty on 〈Nbin〉. The bands below unity on the left of the graphs are centered at the expected value of RAA should the yields scale with 〈Npart〉, and the widths of the bands indicate the systematic uncertainty on 〈Npart〉.

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