科研之友
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摘要
Strange particle production has always been an important probe to study various aspects of the high density, strong interacting matter created in ultra-relativistic heavy-ion collisions. Yields and spectra of strange hadrons have been measured by the STAR experiment for center of mass energies of 62.4 GeV, 130 GeV and 200 GeV per nucleon pair for Au+Au, p+p and d+Au collisions. We have now measured Cu+Cu collisions at 62.4 GeV and 200 GeV, complementing the study of the system size dependence initiated with the centrality dependence study of Au+Au data. We will present preliminary results on Xi, Omega and their anti-particles produced in Cu+Cu collisions. Yields and ratios are compared to results from Au+Au collisions normalized by the equivalent number of participants. The nuclear modification factor of the measured particles from Cu+Cu data also shows the same suppression effects in the high transverse momentum region and a baryon/meson difference in the intermediate momentum region.
- 出版日期2007-9
