Abstract
Values of the ratios in the mid-rapidity yields of λ̄/λ = 0.71 ± 0.01(stat.) ± 0.04(sys.), ξ̄ +/ξ- = 0.83 ± 0.04(stat.) ± 0.05(sys.), Ω̄+/Ω- = 0.95 ± 0.15(stat.) ± 0.05(sys.) and K+/K- = 1.092 ± 0.023(combined) were obtained in central √SNN = 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 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.
Original language | English |
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Pages (from-to) | 167-174 |
Number of pages | 8 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 567 |
Issue number | 3-4 |
DOIs | |
State | Published - Aug 14 2003 |
Bibliographical note
Funding Information:We wish to thank the RHIC Operations Group and the RHIC Computing Facility at Brookhaven National Laboratory, and the National Energy Research Scientific Computing Center at Lawrence Berkeley National Laboratory for their support. This work was supported by the Division of Nuclear Physics and the Division of High Energy Physics of the Office of Science of the US Department of Energy, the United States National Science Foundation, the Bundesministerium fuer Bildung und Forschung of Germany, the Institut National de la Physique Nucleaire et de la Physique des Particules of France, the United Kingdom Engineering and Physical Sciences Research Council, Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, Brazil, the Russian Ministry of Science and Technology, the Ministry of Education of China, the National Natural Science Foundation of China, and the Swiss National Science Foundation.
Keywords
- Antibaryon-to-baryon ratios
- Baryochemical potential
- Relativistic heavy-ion collisions
- STAR
- Strangeness
ASJC Scopus subject areas
- Nuclear and High Energy Physics