大型强子对撞机上膺快度及能量估计研究

利用Mathematica软件研究了相对论重离子对撞中末态带电强子赝快度分布谱,并与大型强子对撞机(LHC)上2.76 TeV及5.02 TeV铅-铅(Pb+Pb)对撞实验数据进行拟合,编写数值算法程序抽取了最中心碰撞流体演化纵向膨胀加速度参数.为了研究纵向加速度效应及流体黏滞效应对夸克胶子等离子早期能量密度估计的影响,依据Bjorken能量密度估计模型,讨论了考虑黏滞效应修正的能量密度估计模型,发现黏滞效应会使对碰撞早期的能量密度估计增大.

The Study on the Estimation of Pseudorapidity Distribution and Energy Density on the Large Hadron Collider

Using the Mathematica software,the pseudo-rapidity distribution for charged particles is investigated in the relativistic heavy ion collisions from an accelerating hydrodynamic model.Such hydrodynamic model describes the pseudo-rapidity distribution data at 2.76 TeV,5.02 TeV(Pb+Pb)and 5.44 Xe+Xe collisions well and extracts the longitudinal acceleration parameters for the most central collision.Based on the Bjorken model,the longitudinal acceleration effect and viscosity effect dependence for the medium initial energy density estimation are investigated,and the results show that the viscosity effect enhances the estimate of the initial energy density.