论文标题
通过Hagedorn共振产生重离子碰撞中的光核
Production of Light Nuclei in Heavy Ion Collisions via Hagedorn Resonances
论文作者
论文摘要
重离子碰撞中光核产生的物理过程尚不清楚。热模型对实验产量的不错的理论描述与观察到的状态的非常小的结合能冲突，在如此炎热且密集的环境中脆弱。其他可用的想法是通过聚结的延迟产生，或者是通过SAHA方程式进行化学冷冻后的系统冷却，或“淬火”而不是热冻结。应用（相互作用的）Hagedorn气体的最近派生的处方巩固上述图片。 Hagedorn态衰减速率在光核中的表格可以计算出由于蒙特卡洛统计数字非常差而通常无法获得的产量。计算稳定的hadron和光核的衰减产量。尽管仅Hagedorn状态的无尺度衰减与实验数据不兼容，但热力体系和Hagedorn State气体能够描述实验数据。根据SAHA方程式对系统进行冷却，并在数量上保存核子和抗核子，导致（几乎）温度无关的产量，因此在温度下产生了远低于化学冷冻温度的光核的产生。
The physical processes behind the production of light nuclei in heavy ion collisions are unclear. The nice theoretical description of experimental yields by thermal models conflicts with the very small binding energies of the observed states, being fragile in such a hot and dense environment. Other available ideas are delayed production via coalescence, or a cooling of the system after the chemical freeze-out according a Saha equation, or a `quench' instead of a thermal freeze-out. A recently derived prescription of an (interacting) Hagedorn gas is applied to consolidate the above pictures. The tabulation of decay rates of Hagedorn states into light nuclei allows to calculate yields usually unaccessable due to very poor Monte Carlo statistics. Decay yields of stable hadrons and light nuclei are calculated. While the scale-free decays of Hagedorn states alone are not compatible with the experimental data, a thermalized hadron and Hagedorn state gas is able to describe the experimental data. Applying a cooling of the system according a Saha-equation with conservation of nucleons and anti-nucleons in number leads to (nearly) temperature independent yields, thus a production of the light nuclei at temperatures much lower than the chemical freeze-out temperature is possible.
