Strange anti-particle to particle ratios at mid-rapidity in sqrt(s_NN)= 130 GeV Au+Au Collisions

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.

arXiv comment6 pages, 3 figures, revtex4, now accepted by Physics Letters B. All figures improved for clarity, fig. 2 now has kaon ratio separated by technique, fig. 3 now has additional other RHIC data points. Minor clarifications in text in response to referee comments. Updated refs

References in corpus (21)

• Elliptic flow in Au+Au collisions at sqrt(s_NN) = 130 GeV
• Energy Dependence of Pion and Kaon Production in Central Pb+Pb Collisions
• Hadron production in Au-Au collisions at RHIC
• Chemical Equilibration in Pb+Pb Collisions at the SPS
• pQCD-based Approach to Parton Production and Equilibration in High-Energy Nuclear Collisions
• Centrality dependence of pi^[+/-], K^[+/-], p and p-bar production from sqrt(s_NN)=130 GeV Au + Au collisions at RHIC
• The RHIC Zero Degree Calorimeter
• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• Mid-rapidity $\Lambda$ and $\bar{\Lambda }$ Production in Au+Au Collisions at $\sqrt{s_{{}_{NN}}}=130$ GeV
• Mid-rapidity anti-proton to proton ratio from Au+Au collisions at $\sqrt{s_{NN}}=130$ GeV
• Measurement of the lambda and lambda^bar particles in Au+Au Collisions at sqrt(s_NN)=130 GeV
• Recent results on spectra and yields from NA49
• Cascade and anti-cascade production in central Pb+Pb collisions at 158 GeV/c per nucleon
• Rapidity dependence of antiproton to proton ratios in Au+Au collisions at sqrt{s_{NN}}=130 GeV
• Quark liberation and coalescence at CERN SPS
• Ratios of charged antiparticles to particles near mid-rapidity in Au+Au collisions at sqrt(s_NN) = 130 GeV
• Hot hadronic matter and strange anti-baryons
• Energy Dependence of $\Lambda$ and $\bar{\Lambda }$ Production at CERN-SPS Energies
• Quark model and strange baryon production in heavy ion collisions
• Signals of the quark-gluon plasma in nucleus-nucleus collisions
• Experimental Conference Summary

Cited by in corpus (31)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Hadron production in central nucleus-nucleus collisions at chemical freeze-out
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Multi-Strange Baryon Production in Au-Au collisions at sqrt(s_NN) = 130 GeV
• Centrality Dependence of Thermal Parameters Deduced from Hadron Multiplicities in Au + Au Collisions at sqrt{s_{NN}} = 130 GeV
• A Fast Hadron Freeze-out Generator
• Energy dependence of hyperon production in nucleus-nucleus collisions at SPS
• Improved Quark Coalescence for a Multi-Phase Transport Model
• Proton-lambda correlations in central Au+Au collisions at sqrt (s_NN)=200 GeV
• Chemical Freeze-out of Strange Particles and Possible Root of Strangeness Suppression
• Electromagnetic dipole moments of charged baryons with bent crystals at the LHC
• Entropy Production at RHIC
• Production rates for hadrons, pentaquarks ${\Theta }^{+}$ and ${\Theta }^{\ast ++}$, and di-baryon $(\Omega \Omega {)}_{0^{+}}$ in relativistic heavy ion collisions by a quark combination model
• Hadron Yield Correlation in Combination Models in High Energy AA Collisions
• On the chemical equilibration of strangeness-exchange reaction in heavy-ion collisions
• Inhomogeneous freeze-out in relativistic heavy-ion collisions
• Properties of quark matter produced in heavy ion collision
• Hadron production from resonance decay in relativistic collisions
• Baryon-anti-baryon Flavor Correlation in Quark Combination Models in Heavy Ion Collisions
• Strange particle production in 158 and 40 $A$ GeV/$c$ Pb-Pb and p-Be collisions
• Energy dependence of {\rm K}${}_{\mathrm{S}}^0$ and hyperon production at CERN SPS
• Collision Energy Dependence of Particle Ratios and Freeze-out Parameters in Ultra Relativistic Nucleus Nucleus Collisions
• EMC effect at small Bjorken x values
• Energy and System Size Dependence of Strangeness Production from SPS to RHIC
• Tracking the baryon number with nuclear collisions
• What's Interesting About Strangeness Production? - An Overview of Recent Results
• Generalized binomial transform applied to the divergent series
• Diomega production in relativistic heavy ion collisions
• Hadron Production in Heavy Ion Collisions
• Evolution of the concept of Quark Matter: the Ianus face of the heavy ion collisions
• Identified charged hadron production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 54.4 GeV with the STAR detector