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arXiv 0810.4257nucl-thhep-ph
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部分子介质的粲强子信号

Charmed hadron signals of partonic medium

O. Linnyk, E. L. Bratkovskaya, W. Cassing

摘要:

我们提出了一个简短的回顾,我们的集体和重离子碰撞的基础上的魅力介子的抑制模式的微观强子-弦动力学(HSD)输运方法的魅力与周围的物质的相互作用的不同方案的结果-的“comover”的介子与进一步的再生D+Dbar通道和“前强子”的相互作用的情况。虽然在SPS能量的强子“comover”吸收方案被发现是与实验数据兼容,在RHIC的c和cbar夸克的动力学是占主导地位的强耦合夸克-胶子等离子体阶段的部分子或“前强子”的相互作用,不能用纯强子相互作用。我们发现,在纯强子的情况下,集体魅力流似乎与SPS能量的数据兼容,但低估了顶部RHIC能量的数据。因此,在RHIC实验上观察到的D介子的大椭圆流v2和J/Psi的低R_AA(pT)应归因于非强子自由度的早期相互作用。同时,我们观察到,非强子相互作用是强制性的,以描述在顶部RHIC能量从p+p到中心Au+Au碰撞的J/Psi快度分布的缩小。此外,我们还证明了强淬灭的高pT J/Psi的中心Au+Au碰撞表明,最终J/Psi介子的一部分是由合并机制接近相边界。

英文摘要:

We present a short review of our results on the collectivity and the suppression pattern of charmed mesons in heavy-ion collisions based on the microscopic Hadron-String Dynamics (HSD) transport approach for different scenarios of charm interactions with the surrounding matter - the 'comover' dissociation by mesons with further recreation by D+Dbar channels and 'pre-hadronic' interaction scenarios. While at SPS energies the hadronic 'comover' absorption scenario is found to be compatible with the experimental data, the dynamics of c and cbar quarks at RHIC are dominated by partonic or 'pre-hadronic' interactions in the strongly coupled quark-gluon plasma stage and cannot be modeled by pure hadronic interactions. We find that the collective flow of charm in the purely hadronic scenario appears compatible with the data at SPS energies but underestimates the data at top RHIC energies. Thus, the large elliptic flow v2 of D mesons and the low R_AA(pT) of J/Psi seen experimentally at RHIC have to be attributed to early interactions of non-hadronic degrees of freedom. Simultaneously, we observe that non-hadronic interactions are mandatory in order to describe the narrowing of the J/Psi rapidity distribution from p+p to central Au+Au collisions at the top RHIC energy. We demonstrate additionally that the strong quenching of high-pT J/Psi's in central Au+Au collisions indicates that a fraction of final J/Psi mesons is created by a coalescence mechanism close to the phase boundary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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