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Elliptic Flow and Constituent Quark Scaling in High Energy Nuclear Collisions

机译：高能量核碰撞中的椭圆形流量和组成夸克缩放

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The number-of-constituent-quark (NCQ) scaling of the anisotropic flow υ_2 for various hadron species is studied for Au+Au collisions at (S_(NN))~(1/2) = 200 GeV within a hadron transport approach (UrQMD). Although the model reaches only 60% of the of the experimental value of υ_2, it predicts the particle-type dependence of υ_2, as observed by the RHIC experiments: υ_2 exhibits a hadron-mass hierarchy (HMH) in the low p_T region and a NCQ dependence in the intermediate p_T region. The failure of the hadronic models to reproduce the absolute magnitude of the observed υ_2 indicates that transport calculations of heavy ion collisions at RHIC must incorporate interactions among quarks and gluons in the early, hot and dense phase. The presence of an NCQ scaling in the string-hadron model results suggests that the particle-type dependencies observed in heavy-ion collisions at intermediate p_T are related to the hadronic cross sections in vacuum rather than to the hadronization process itself, as suggested by quark recombination models.
机译：对于各种强子种类的各向异性流动ψ_2的组成夸克（NCQ）缩放为Au + Au碰撞（S_（NN））〜（1/2）= 200 GEV（ urqmd）。虽然该模型仅达到χ_2的实验值的60％，但是它预测了χ_2的粒度依赖性，如RARIC实验所观察到的：υ_2在低P_T区域中展示了HADRON质量等级（HMH） NCQ依赖于中间P_T区域。强子模型，以再现观测到的υ_2的绝对值的失败表明，在RHIC重离子碰撞的交通计算必须纳入早期，炽热和稠密的相夸克和胶子之间的相互作用。在串 - 强子模型的结果的NCQ缩放的存在表明，即在中间P_T在重离子碰撞中观察到的粒子的类型依赖关系有关的强子的横截面在真空而不是对强子过程本身由夸克的建议重组模型。

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