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University of Birmingham, Birmingham, United Kingdom.
Phys Rev Lett. 2005 Sep 16;95(12):122301. doi: 10.1103/PhysRevLett.95.122301. Epub 2005 Sep 13.
We report on the first measurement of elliptic flow v2(pT) of multistrange baryons Xi- +Xi+ and Omega- + Omega+ in heavy-ion collisions. In minimum-bias Au+Au collisions at square root of s(NN)=200 GeV, a significant amount of elliptic flow, comparable to other nonstrange baryons, is observed for multistrange baryons which are expected to be particularly sensitive to the dynamics of the partonic stage of heavy-ion collisions. The pT dependence of v2 of the multistrange baryons confirms the number of constituent quark scaling previously observed for lighter hadrons. These results support the idea that a substantial fraction of the observed collective motion is developed at the early partonic stage in ultrarelativistic nuclear collisions at the Relativistic Heavy Ion Collider.
我们报告了在重离子碰撞中首次对多奇异重子Ξ⁻ + Ξ⁺和Ω⁻ + Ω⁺的椭圆流v₂(pₜ)进行的测量。在质心能量平方根√s(NN)=200 GeV的最小无偏金离子+金离子碰撞中，对于预计对重离子碰撞部分子阶段动力学特别敏感的多奇异重子，观测到了与其他非奇异重子相当的显著椭圆流。多奇异重子v₂的pₜ依赖性证实了先前在较轻强子中观察到的夸克组成数标度。这些结果支持了这样一种观点，即在相对论重离子对撞机的超相对论核碰撞中，很大一部分观测到的集体运动是在早期部分子阶段产生的。
