Strange antiparticle-to-particle ratios at mid-rapidity in root s(NN)=130 GeV Au+Au collisions
Physics Letters B 567,3-4 (2003) 167-174;
Values of the ratios in the mid-rapidity yields of (&ULambda;) over bar/Lambda = 0.71 +/- 0.01(stat.) +/- 0.04(sys.), (&UXi;) over bar (+)/Xi(-) = 0.83 +/- 0.04(stat.) +/- 0.05(sys.), (&UOmega;) over bar (+)/Omega(-) = 0.95 +/- 0.15(stat.) +/- 0.05(sys.) and K+/K- = 1.092 +/- 0.023(combined) were obtained in central,rootS(NN) = 130 GeV Au + An 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 antihyperons 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. (C) 2003 Published by Elsevier B.V.
relativistic heavy-ion collisions;; antibaryon-to-baryon ratios;; baryochemical potential;; strangeness;; star;; heavy-ion collisions;; central pb+pb collisions;; quark-gluon plasma;; pb-pb collisions;; cern-sps;; j/psi suppression;; baryon production;; direct photons;; au collisions;; nucleon
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