论文标题
用3+1D IP胶质探索纵向可观察物
Exploring Longitudinal Observables with 3+1D IP-Glasma
论文作者
论文摘要
我们介绍了重离子碰撞的初始状态的表述，该状态概括了2+1D不变的ip-glasma \ cite {schenke：2012wb}到3+1d，从jimwlk jimwlk迅速发展的威尔逊线迅速发展。 JIMWLK演化引入的速度依赖性使我们改变了量规场的初始条件，并在迭代中求解高斯定律，以便在3维晶格上进行时间演化。 尽管几乎已经详尽地研究了QGP的横向物理学，但Jimwlk Evolution引入的纵向波动的效果尚未在现象学上进行详细研究。因此，我们将3+1D IP-GLASMA模型与音乐+URQMD相结合，以完全3+1D模拟重离子碰撞。具体而言，我们考虑$ \ sqrt {s} = 2.76 \，{\ rm tev} $的PB-PB碰撞，并通过$η$ reptistort的流量分量率$ r_n（η_a，η_a，η_b）AS s cms来研究带电的强子$ v_n（η）$的速度依赖性。 \ cite {khachatryan：2015oea}，以及带电的强子多重性$ dn_ {ch}/dη$。
We present a formulation of the initial state of heavy ion collisions that generalizes the 2+1D boost invariant IP-Glasma \cite{Schenke:2012wb} to 3+1D through JIMWLK rapidity evolution of the pre-collision Wilson lines. The rapidity dependence introduced by the JIMWLK evolution leads us to modify the initial condition for the gauge fields, and to solve Gauss' law iteratively in order to allow for temporal evolution on a 3-dimensional lattice. While the transverse physics of QGP has been studied nearly exhaustively, the effect of longitudinal fluctuations introduced by the JIMWLK evolution has yet to be studied in detail phenomenologically. Hence, we couple our 3+1D IP-Glasma model to MUSIC+UrQMD, for completely 3+1D simulations of heavy ion collisions. Specifically, we consider Pb-Pb collisions at $\sqrt{s} = 2.76\, {\rm TeV}$ and study the rapidity dependence of the charged hadron $v_n(η)$ via the $η$-dependent flow factorization ratios $r_n(η_a,η_b)$ as measured by CMS \cite{Khachatryan:2015oea}, as well as the charged hadron multiplicity $dN_{ch}/dη$.
