论文标题
从两粒子横向动量相关性中提取夸克 - 胶质等离子体的特异性剪切粘度
Extraction of the specific shear viscosity of quark-gluon plasma from two-particle transverse momentum correlations
论文作者
论文摘要
根据RHIC和LHC在超幼发学重型离子碰撞中形成的Quark-Gluon等离子体的特定剪切粘度，估计是根据横向动量的横向纵向扩展的横向纵向扩展，两极 - 固有的两极型相关器，$ g_2 $，$ g_2 $，据报道，据报道，据报道，据报道，根据星星和Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and Alice and collations and。使用Gavin Ansatz计算估计值是碰撞中心性的函数，将$ G_2 $纵向扩展与特定的剪切粘度联系起来。使用ANSATZ所需的冻结时间是使用冻结时间的线性拟合来计算的，该冻结时间是带电的粒子伪型pseudorapition $（{\ rm d} n _ {\ rm ch}/{\ rm ch}/{\ rm d} n}^{1/3} $。基于爱丽丝数据的$η/s $的估计几乎不依赖于LHC Energy在LHC Energy处的碰撞中心性，而从Star Data提示获得的估计值表示，$η/S $可能是Top Rhic Energy碰撞中心性的函数。
The specific shear viscosity, $η/s$, of the quark-gluon plasma formed in ultrarelativistic heavy-ion collisions at RHIC and LHC is estimated based on the progressive longitudinal broadening of transverse momentum two-particle correlators, $G_2$, reported as a function of collision centrality by the STAR and ALICE experiments. Estimates are computed as a function of collision centrality using the Gavin ansatz which relates the $G_2$ longitudinal broadening to the specific shear viscosity. Freeze out times required for the use of the ansatz are computed using a linear fit of freeze out times reported as a function of the cubic root of the charged particle pseudorapidity density $({\rm d}N_{\rm ch}/{\rm d}η)^{1/3}$. Estimates of $η/s$ based on ALICE data exhibit little to no dependence on collision centrality at LHC energy, while estimates obtained from STAR data hint that $η/s$ might be a function of collision centrality at top RHIC energy.
