Strange anti-particle to particle ratios at mid-rapidity in s(NN)**(1/2) = 130-GeV Au+Au collisions

The STAR collaboration
Phys.Lett.B 567 (2003) 167-174, 2003.

Abstract (data abstract)
Values of the ratios in the mid-rapidity yields of anti-Lambda/Lambda = 0.71 +/- 0.01(stat.) +/- 0.04(sys.), anti-Xi+/Xi- = 0.83 +/- 0.04(stat.) +/- 0.05 (sys.), anti-Omega+/Omega- = 0.95 +/- 0.15(stat) +/- 0.05(sys.) and K+/K- 1.092 +/- 0.023(combined) were obtained in central sqrt(s_NN) = 130 GeV Au+Au collisions using the STAR detector. The ratios indicate that a fraction of the net-baryon number from the initial system is present in the excess of hyperons over anti-hyperons at mid-rapidity. The trend in the progression of the baryon ratios, with increasing strange quark content, is similar to that observed in heavy-ion collisions at lower energies. The value of these ratios may be related to the charged kaon ratio in the framework of simple quark-counting and thermal models.

  • Figure 1a


    Invariant mass distributions for $\Lambda$ and Anti-$\Lambda$

  • Figure 1b


    Invariant mass distributions for $\Xi$ and Anti-$\Xi$

  • Figure 1c


    Invariant mass distributions for $\Omega$ and Anti-$\Omega$

  • Figure 2


    The ratios Anti-Λ/Λ, K+/K-, and Anti-Ξ+/Ξ- as a function of pT

  • Figure 3


    Anti-baryon to baryon ratios measured by STAR

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