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arXiv 0709.4622hep-ph
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RHIC中横动量下的动力学和强子化

Dynamics and Hadronization at intermediate transverse momentum at RHIC

V. Greco, H. van Hees, R. Rapp

摘要:

RHIC的超相对论重离子计划表明,在中等横动量($p_T \simeq 2$-6 GeV)下,标准(独立)部分子碎裂既不能描述重子介子比,也不能描述强子椭圆流($v_2$)根据价夸克数的经验标度.这两个方面找到一个自然的解释,而不是在一个合并加碎裂的方法强子化。在简要回顾了轻夸克的主要结果后,我们把重点放在重夸克上,这表明一个结合的碎裂和夸克聚结框架也是相关的。此外,在相对论朗之万模拟中,我们发现的证据的重要性,重轻共振的夸克-胶子等离子体(QGP)来解释强的能量损失和集体流的重夸克光谱推断从非光子电子观测。这样的重-轻共振可以为统一理解QGP的微观结构及其随后的强子化铺平道路。

英文摘要:

The ultra-relativistic heavy-ion program at RHIC has shown that at intermediate transverse momenta ($p_T \simeq 2$-6 GeV) standard (independent) parton fragmentation can neither describe the observed baryon-to-meson ratios nor the empirical scaling of the hadronic elliptic flow ($v_2$) according to the number of valence quarks. Both aspects find instead a natural explanation in a coalescence plus fragmentation approach to hadronization. After a brief review of the main results for light quarks, we focus on heavy quarks showing that a combined fragmentation and quark-coalescence framework is relevant also here. Moreover, within relativistic Langevin simulations we find evidence for the importance of heavy-light resonances in the Quark-Gluon Plasma (QGP) to explain the strong energy loss and collective flow of heavy-quark spectra as inferred from non-photonic electron observables. Such heavy-light resonances can pave the way to a unified understanding of the microscopic structure of the QGP and its subsequent hadronization by coalescence.

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