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Yale University, New Haven, Connecticut 06520, USA.
Phys Rev Lett. 2006 Sep 29;97(13):132301. doi: 10.1103/PhysRevLett.97.132301. Epub 2006 Sep 25.
We report the measurements of Sigma(1385) and Lambda(1520) production in p+p and Au+Au collisions at sqrt[s{NN}]=200 GeV from the STAR Collaboration. The yields and the p(T) spectra are presented and discussed in terms of chemical and thermal freeze-out conditions and compared to model predictions. Thermal and microscopic models do not adequately describe the yields of all the resonances produced in central Au+Au collisions. Our results indicate that there may be a time span between chemical and thermal freeze-out during which elastic hadronic interactions occur.
我们报告了STAR合作组在质心能量√[s{NN}]=200 GeV的质子-质子（p+p）和金-金（Au+Au）碰撞中对西格玛（1385）和拉姆达（1520）产生的测量结果。给出了产额和横动量（p(T)）谱，并根据化学和热冻结条件进行了讨论，并与模型预测进行了比较。热模型和微观模型不能充分描述中心金-金碰撞中产生的所有共振态的产额。我们的结果表明，在化学冻结和热冻结之间可能存在一个时间段，在此期间发生弹性强子相互作用。
