Heavy-Quark Diffusion and Hadronization in Quark-Gluon Plasma
Heavy-Quark Diffusion and Hadronization in Quark-Gluon Plasma
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DOI：
10.1103/physrevc.86.014903
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发表时间：
2011-06
影响因子：
3.1
通讯作者：
M. He;R. Fries;R. Rapp
中科院分区：
文献类型：
--
作者：
M. He;R. Fries;R. Rapp
我们计算了高能重离子碰撞中重夸克的扩散和强子化，在微观和宏观分量中实现了强耦合夸克-胶子等离子体的概念。扩散过程中使用相对论性的福克-普朗克动力学的弹性散射在流体动力学背景下进行了模拟。介质中的重夸克输运系数是由非微扰T矩阵相互作用得到的，这种相互作用建立了接近于相变温度的共振关联。后者也是重夸克通过与介质中的轻夸克复合而强子化为重味介子的基础。相关的共振复合满足能量守恒，并提供了夸克和介子分布之间的平衡映射。复合几率是由共振重夸克散射率导出的。发现在低横向动量（pT）下，膨胀占主导地位，在高pT下产生碎裂。我们的方法强调了共振相关的扩散和强子化过程中的作用。在相对论重离子对撞机上对Au-Au碰撞中D和B介子及其衰变电子的核修正因子和椭圆流的计算表明了真实介质流在定量解释重味数据中的重要性。
We calculate diffusion and hadronization of heavy quarks in high-energy heavy-ion collisions, implementing the notion of a strongly coupled quark-gluon plasma in both micro- and macroscopic components. The diffusion process is simulated using relativistic Fokker-Planck dynamics for elastic scattering in a hydrodynamic background. The heavy-quark transport coefficients in the medium are obtained from nonperturbative T -matrix interactions which build up resonant correlations close to the transition temperature. The latter also form the basis for hadronization of heavy quarks into heavy-flavor mesons via recombination with light quarks from the medium. The pertinent resonance recombination satisfies energy conservation and provides an equilibrium mapping between quark and meson distributions. The recombination probability is derived from the resonant heavy-quark scattering rate. Recombination is found to dominate at low transverse momentum (pT ) and to yield to fragmentation at high pT . Our approach emphasizes the role of resonance correlations in the diffusion and hadronization processes. Calculations of the nuclear modification factor and elliptic flow of D and B mesons and their decay electrons in Au-Au collisions at the Relativistic Heavy Ion Collider indicate the importance of a realistic medium flow in a quantitative interpretation of heavy-flavor data.