Heavy-quark probes of the quark-gluon plasma and interpretation of recent data taken at the BNL Relativistic Heavy Ion Collider
Heavy-quark probes of the quark-gluon plasma and interpretation of recent data taken at the BNL Relativistic Heavy Ion Collider
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DOI：
10.1103/physrevc.73.034913
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发表时间：
2005-08
影响因子：
3.1
通讯作者：
H. Hees;V. Greco;R. Rapp
中科院分区：
文献类型：
--
作者：
H. Hees;V. Greco;R. Rapp
基于膨胀夸克胶子等离子体(QGP)中的弹性部分子重散射，研究了超相对论重离子碰撞中Charm(C)和Bottom(B)夸克的热化和集体流动。我们证明了强相互作用量子粒子对撞机(SQGP)中的共振相互作用以及部分子合并在解释BNL相对论重离子对撞机(RHIC)最近的数据中起到了至关重要的作用，从而解释了最近在晶格量子色动力学中发现的thenatureofthesQGPanditshadronization.Ourmainassumption，是在sQGP中存在D-a Ndb介子态，从而提供了重夸克的共振截面。在相对论朗之万模拟中引入了相关的阻力和扩散系数，用于计算RHIC上Au-Au碰撞中Fb-a NDC-夸克的横向动量谱和方位不对称性(V2)。在使用夸克合并和碎裂强子化为D-a NdB介子后，关联的电子衰变谱和v2与最近的RHIC数据进行了比较。我们的结果建议重新评估sQGP中辐射夸克和弹性夸克的能量损失机制。
Thermalization and collective flow of charm (c) and bottom (b) quarks in ultrarelativistic heavy-ion collisions are evaluated based on elastic parton rescattering in an expanding quark-gluon plasma (QGP). We show that resonant interactions in a strongly interacting QGP (sQGP), as well as parton coalescence, can play an essential role in the interpretation of recent data from the BNL Relativistic Heavy-Ion Collider (RHIC), and thus illuminate thenatureofthesQGPanditshadronization.Ourmainassumption,motivatedbyrecentfindingsinlatticequantum chromodynamics, is the existence of D -a ndB-meson states in the sQGP, providing resonant cross sections for heavy quarks. Pertinent drag and diffusion coefficients are implemented into a relativistic Langevin simulation to compute transverse-momentum spectra and azimuthal asymmetries (v2 )o fb -a ndc-quarks in Au-Au collisions at RHIC. After hadronization into D -a ndB-mesons using quark coalescence and fragmentation, associated electron-decay spectra and v2 are compared to recent RHIC data. Our results suggest a reevaluation of radiative and elastic quark energy-loss mechanisms in the sQGP.