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首页> 外文会议>Winter Workshop on Nuclear Dynamics; 20060311-18; La Jolla,CA(US) >Elliptic Flow and Constituent Quark Scaling in High Energy Nuclear Collisions
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Elliptic Flow and Constituent Quark Scaling in High Energy Nuclear Collisions

机译：高能核碰撞中的椭圆流和成分夸克缩放

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摘要

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：研究了在强子输运方法下（S_（NN））〜（1/2）=（200 GeV）下Au + Au碰撞时，各种强子物种的各向异性流υ_2的组成夸克（NCQ）标度缩放（ UrQMD）。尽管该模型仅达到υ_2实验值的60％，但它可以预测υ_2的颗粒类型依赖性，如RHIC实验所观察到的：υ_2在低p_T区表现出强子质量等级（HMH），且中间p_T区域中的NCQ依赖性。强子模型无法再现观测到的υ_2的绝对大小，这表明在RHIC上重离子碰撞的输运计算必须考虑到夸克与胶子在早期，高温和致密相中的相互作用。弦强子模型结果中存在NCQ缩放比例表明，在中间p_T的重离子碰撞中观察到的粒子类型相关性与真空中的强子截面有关，而不是由夸克所暗示的强子化过程本身重组模型。

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