Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-01-25
J.Phys.G34:S921-924,2007
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 3 figures, proceedings of the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006)
Scientific paper
10.1088/0954-3899/34/8/S126
We present the first measurements of the transverse momentum spectra and mid-rapidity yields of the $\Xi^{0}(1530)$ multi-strange baryon resonance, from $\sqrt{\mathrm{s_{NN}}}=200$ GeV Au+Au collisions at RHIC from the STAR experiment. Ratios of the mid-rapidity yield of this long-lived ($c\tau=21$ fm) resonance to its non-resonance partner (the $\Xi$ baryon) are compared to predictions from thermal models and to the corresponding ratios for other resonances previously reported by STAR. Conclusions will be drawn about the implication of these measurements for the time between chemical and thermal freeze-out ($\Delta t_{therm-chem}$) and any observed deviations from the expected mass and width will be discussed.
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