论文标题
$ ϕ $和$ω$可观察到的夸克 - 格鲁恩等离子体的特定剪切和散装粘度的贝叶斯推断
Bayesian Inference of the Specific Shear and Bulk Viscosities of the Quark-Gluon Plasma at Crossover from $ϕ$ and $Ω$ Observables
论文作者
论文摘要
由于其最终状态相互作用弱，$ ϕ $ Meson和$ω$ BARYON提供了对相对论重型离子碰撞中形成的Quark-Gluon等离子体（QGP）性质的独特探针。使用夸克相位空间信息在粘性的爆炸器中进行参数化，我们研究了$ ϕ $的横向momentum光谱和椭圆流的e+au+au collisions $ \ sqrt { $ \ sqrt {s _ {\ rm nn}}} = 2.76 $ tev。粘性爆炸波包括由于剪切和散装应力引起的热分布的非平衡变形，因此传递有关特定的剪切粘度$η/s $的信息以及QGP的特定散装粘度$ζ/s $。我们与贝叶斯推理进行模型到数据的比较，并同时获得$η/s =（2.08^{+1.10} _ { - 1.09}）/4π$和$ζ/s = 0.06^{+0.06^{+0.04} _ { - 0.04} $ { - 0.04} $ in 90 \％$ $ c.l. c.l.对于跨界温度下的无重力QGP，大约160美元的MEV。我们的工作提供了一种新颖的方法，可以同时确定在强调时QGP的$η/s $和$ζ/s $。
Due to their weak final state interactions, the $ϕ$ meson and $Ω$ baryon provide unique probes of the properties of the quark-gluon plasma (QGP) formed in relativistic heavy-ion collisions. Using the quark recombination model with the quark phase-space information parameterized in a viscous blastwave, we study the transverse-momentum spectra and elliptic flows of $ϕ$ and $Ω$ in Au+Au collisions at $\sqrt{s_{\rm NN}} = 200$ GeV and Pb+Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV. The viscous blastwave includes non-equilibrium deformations of thermal distributions due to shear and bulk stresses and thus carries information on the specific shear viscosity $η/s$ and the specific bulk viscosity $ζ/s$ of the QGP. We perform a model-to-data comparison with Bayesian inference and simultaneously obtain $η/s=(2.08^{+1.10}_{-1.09})/4π$ and $ζ/s= 0.06^{+0.04}_{-0.04}$ at $90\%$ C.L. for the baryon-free QGP at crossover temperature of about $160$ MeV. Our work provides a novel approach to simultaneously determine the $η/s$ and $ζ/s$ of the QGP at hadronization.
