Speaker
Dr
Xianglei Zhu
(Tsinghua University)
Description
Multi-strange hadrons are excellent probe to the hadronization of the hot and dense medium produced in heavy ion collisions, since they may decouple earlier from the hadronic system. The measurements of Ω enhancement factor in heavy ion collisions is good test of canonical models, and Ω nuclear modification factors at intermediate pT are also good examination of recombination/coalescence models. However, the limited statistics put large uncertainties in those measurements. The high-statistics p+p, Au+Au and U+U data collected by STAR during the years of 2011 and 2012 will enable a high-precision systematic survey of these observables. Comparing data from Au+Au and U+U collisions also allows us to identify possible different medium properties due to different system size.
In this talk, we present the measurements of Ω production in p+p, Au+Au and U+U collisions at top RHIC energies. The Ω nuclear modification factors will be presented for both Au+Au and U+U collisions. Strangeness enhancement factors for Ω in U+U, Au+Au with respect to p+p collisions will be presented as well. Implications on collision dynamics will be discussed.
Author
Dr
Xianglei Zhu
(Tsinghua University)
