Estimating the charm quark diffusion coefficient and thermalization time from D meson spectra at energies available at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider
Estimating the charm quark diffusion coefficient and thermalization time from D meson spectra at energies available at the BNL Relativistic Heavy Ion Collider and the CERN Large Hadron Collider
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DOI：
10.1103/physrevc.96.044905
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发表时间：
2017-07
影响因子：
3.1
通讯作者：
F. Scardina;S. Das;V. Minissale;S. Plumari;V. Greco
中科院分区：
文献类型：
--
作者：
F. Scardina;S. Das;V. Minissale;S. Plumari;V. Greco
用玻尔兹曼输运方法描述了粲夸克在夸克-胶子等离子体（QGP）中的传播。重夸克和轻夸克之间的非微扰相互作用已经通过准粒子方法得到了考虑，在准粒子方法中，轻的部分被赋予了晶格量子色动力学（lQCD）热力学的热质量。这样的模型能够描述非摄动动力学的主要特征：附近相互作用强度的增强。我们证明了由此产生的中粲演化能够同时正确地预测相对论重离子对撞机和大型强子对撞机（LHC）能量和不同中心性下的核抑制因子和椭圆流。粲夸克的强子化是用破碎加聚结的混合模型来描述的，它对与实验数据一致起着关键作用。我们也在朗之万方法中进行了计算，它可以导致与玻尔兹曼非常相似的结果，但是魅力阻力系数要减少大约1，并且产生的椭圆流也要小一些。最后，我们将用我们的现象学方法提取的空间扩散系数与晶格QCD结果进行了比较，发现在当前系统不确定性范围内存在令人满意的一致性。我们的分析表明，在极限情况下，迷人的热化时间约为，小于QGP在LHC能量下的寿命。
We describe the propagation of charm quarks in the quark-gluon plasma (QGP) by means of a Boltzmann transport approach. Nonperturbative interaction between heavy quarks and light quarks have been taken into account through a quasiparticle approach in which light partons are dressed with thermal masses tuned to lattice quantum chromodynamics (lQCD) thermodynamics. Such a model is able to describe the main feature of the nonperturbative dynamics: the enhancement of the interaction strength near. We show that the resulting charm in-medium evolution is able to correctly predict simultaneously the nuclear suppression factor,, and the elliptic flow,, at both Relativistic Heavy Ion Collider and Large Hadron Collider (LHC) energies and at different centralities. The hadronization of charm quarks is described by mean of an hybrid model of fragmentation plus coalescence and plays a key role toward the agreement with experimental data. We also performed calculations within the Langevin approach, which can lead to very similaras Boltzmann, but the charm drag coefficient as to be reduced by about aand also generates an elliptic flowis about asmaller. We finally compare the space diffusion coefficientextracted by our phenomenological approach to lattice QCD results, finding a satisfying agreement within the present systematic uncertainties. Our analysis implies a charm thermalization time, in thelimit, of about, which is smaller than the QGP lifetime at LHC energy.