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AGH University of Science and Technology, Cracow 30-059, Poland.
University of Kentucky, Lexington, Kentucky 40506-0055, USA.
Phys Rev Lett. 2016 Feb 12;116(6):062301. doi: 10.1103/PhysRevLett.116.062301. Epub 2016 Feb 10.
We present high precision measurements of elliptic flow near midrapidity (|y|<1.0) for multistrange hadrons and ϕ meson as a function of centrality and transverse momentum in Au+Au collisions at center of mass energy √[sNN]=200 GeV. We observe that the transverse momentum dependence of ϕ and Ω v2 is similar to that of π and p, respectively, which may indicate that the heavier strange quark flows as strongly as the lighter up and down quarks. This observation constitutes a clear piece of evidence for the development of partonic collectivity in heavy-ion collisions at the top RHIC energy. Number of constituent quark scaling is found to hold within statistical uncertainty for both 0%-30% and 30%-80% collision centrality. There is an indication of the breakdown of previously observed mass ordering between ϕ and proton v2 at low transverse momentum in the 0%-30% centrality range, possibly indicating late hadronic interactions affecting the proton v2.
我们给出了在质心能量√[sNN]=200 GeV的金离子与金离子碰撞中，多奇异强子和ϕ介子在中快度（|y|<1.0）附近椭圆流随中心度和横向动量变化的高精度测量结果。我们观察到，ϕ介子和Ω粒子的横向动量依赖性分别与π介子和质子的类似，这可能表明较重的奇异夸克与较轻的上夸克和下夸克一样强烈地流动。这一观察结果为在相对论重离子对撞机（RHIC）最高能量下重离子碰撞中部分子集体性的发展提供了明确的证据。发现在0%-30%和30%-80%碰撞中心度下，夸克组成数标度在统计不确定性范围内成立。在0%-30%中心度范围内，低横向动量下ϕ介子和质子的v2之间先前观察到的质量排序出现了破坏迹象，这可能表明晚期强子相互作用影响了质子的v2。
