重离子碰撞中的胶子热点初始条件
Gluonic Hot Spot Initial Conditions in Heavy-Ion Collisions
摘要：
重离子碰撞中的初始条件在许多不同的框架下进行了计算。在模拟流体动力学计算输入的初始条件时，已经确定了核子位置波动在核和亚核子结构中的重要性。然而，关于这些初始条件仍然存在一些悬而未决的问题，包括在LHC上测量超中心0- 1%Pb +Pb碰撞中椭圆形$v_{2}$和三角形$v_{3}$流动系数的近似等价性。最近，一个名为MAGMA的计算通过彩色玻璃凝聚体框架中的两点散射子将胶子热点结合起来，并且没有核子，提供了与ATLAS实验测量的这些流动系数同时匹配的结果，包括超中心0-1%碰撞。我们的计算表明，MAGMA的初始条件不描述实验数据时，运行通过全流体动力学的SONIC模拟或当热点从一个核解决热点从其他核，在彩色玻璃冷凝框架中预测。我们还探讨了其他初始条件的计算，并讨论其影响。
英文摘要：
The initial conditions in heavy-ion collisions are calculated in many different frameworks. The importance of nucleon position fluctuations within the nucleus and sub-nucleon structure has been established when modeling initial conditions for input to hydrodynamic calculations. However, there remain outstanding puzzles regarding these initial conditions, including the measurement of the near equivalence of the elliptical $v_{2}$ and triangular $v_{3}$ flow coefficients in ultra-central 0-1% Pb+Pb collisions at the LHC. Recently a calculation termed MAGMA incorporating gluonic hot spots via two-point correlators in the Color Glass Condensate framework, and no nucleons, provided a simultaneous match to these flow coefficients measured by the ATLAS experiment, including in ultra-central 0-1% collisions. Our calculations reveal that the MAGMA initial conditions do not describe the experimental data when run through full hydrodynamic SONIC simulations or when the hot spots from one nucleus resolve hot spots from the other nucleus, as predicted in the Color Glass Condensate framework. We also explore alternative initial condition calculations and discuss their implications.
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