arXiv 1508.005522015-08hep-phnucl-exnucl-th

用CUJET3 .0桥接夸克-胶子等离子体的软硬输运性质

Bridging Soft-Hard Transport Properties of Quark-Gluon Plasmas with CUJET3.0

Jiechen Xu, Jinfeng Liao, Miklos Gyulassy

备注：: 50 pages, 14 figures; v3: typos corrected, new references and discussions included; published in JHEP
发表信息：: JHEP 1602 (2016) 169
DOI：: 10.1007/JHEP02(2016)169

摘要：

将基于微扰QCD的CUJET 2.0模型推广到包含$T_c\approx 160$ MeV附近QCD禁闭交叉相变的两个互补的非微扰特征：（1）夸克和胶子自由度的抑制和（2）色磁自由度的出现，构造了一个新的核碰撞喷注猝灭模型CUJET 3.0.这种半夸克-胶子-单极等离子体（sQGMP）的微观方案进行了测试，通过比较预测的领先强子核修改因子，$R^h_{AA}(p_T>10{\rm GeV/c},\sqrt{s})$，和他们的方位角椭圆不对称性$v^h_2(p_T>10{\rm GeV/c},\sqrt{s})$与现有的数据$h=π,D,B$喷流碎片在RHIC（$\sqrt{s}=0.2$ ATEV）和LHC（$\sqrt{s}$ =2.76 ATEV）的核碰撞。的sQGMP模型，以解决长期存在的$R_{AA}$与$v_2$的难题，通过预测的最大值的喷流淬火参数字段$\hat{q}(E,T)/T^3$附近的$T_c$。通过将sQGMP $\hat{q}$向下外推至热能$E\sim 3 T$尺度并显示sQGMP剪切粘度与熵密度比$η/s \approx T^3/\hat{q}$在$(1-2)T_c$范围内接近么正性边界$1/4π$，证明了射流淬灭与所观察到的本体完美流动性的一致性。CUJET 2.0和CUJET 3.0的详细比较表明，显著不同的$\hat{q}(T)$可以与相同的$R_{AA}$数据相一致，只能通过各向异性观测值来区分。这些研究结果清楚地表明，专注于射流路径平均量$<\hat{q}>$作为唯一相关的介质属性来表征射流淬火的不足，并指出其他重要因素的关键作用，如等离子体的铬电和磁复合材料，筛选群众和运行耦合在多个尺度上，所有强烈影响射流能量损失。

英文摘要：

A new model of jet quenching in nuclear collisions, CUJET3.0, is constructed by generalizing the perturbative QCD based CUJET2.0 model to include two complementary non-perturbative features of the QCD confinement cross-over phase transition near $T_c\approx 160$ MeV: (1) the suppression of quark and gluon degrees of freedom and (2) the emergence of chromo-magnetic monopole degrees of freedom. Such a semi-Quark-Gluon-Monopole Plasma (sQGMP) microscopic scenario is tested by comparing predictions of the leading hadron nuclear modification factors, $R^h_{AA}(p_T>10{\rm GeV/c},\sqrt{s})$, and their azimuthal elliptic asymmetry $v^h_2(p_T>10{\rm GeV/c},\sqrt{s})$ with available data on $h=π,D,B$ jet fragments from nuclear collisions at RHIC($\sqrt{s}=0.2$ ATeV) and LHC($\sqrt{s}$=2.76 ATeV). The sQGMP model is shown to solve the long standing $R_{AA}$ vs $v_2$ puzzle by predicting a maximum of the jet quenching parameter field $\hat{q}(E,T)/T^3$ near $T_c$. The consistency of jet quenching with observed bulk perfect fluidity is demonstrated by extrapolating the sQGMP $\hat{q}$ down to thermal energy $E\sim 3 T$ scales and showing that the sQGMP shear viscosity to entropy density ratio $η/s \approx T^3/\hat{q}$ falls close to the unitarity bound, $1/4π$, in the range $(1-2)T_c$. Detailed comparisons of CUJET2.0 and CUJET3.0 reveal that the remarkably different $\hat{q}(T)$ could be consistent with the same $R_{AA}$ data and could only be distinguished by anisotropy observables. These findings demonstrate clearly the inadequacy of focusing on the jet path averaged quantity $<\hat{q}>$ as the only relevant medium property to characterize jet quenching, and point to the crucial roles of other essential factors, such as the chromo electric and magnetic composites of the plasma, the screening masses and the running couplings at multiple scales that all strongly influence jet energy loss.

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英文摘要：

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