论文标题
了解$ b_2 $在重离子碰撞中的能量依赖性：体积和太空相关性的相互作用
Understanding the energy dependence of $B_2$ in heavy ion collisions: Interplay of volume and space-momentum correlations
论文作者
论文摘要
proton+质子+质子和核+核碰撞的杜特龙合并参数在$ \ sqrt {s_ {nn}} = $ 900-7000 GEV的质子+质子+质子和$ \ sqrt {s_ {s_ {s_ {nn} = $ 2-2760 gev的能量范围内超元素量子分子动力学（URQMD）传输模型，该模型由Deuteron和抗Deuteron生产的事件相结合模型补充。将结果与E866，E877，Phenix，Star和Alice实验进行比较。 $ b_2 $值是从质子和杜特隆的最终光谱中计算出来的。在较低的能量下，$ \ sqrt {s_ {nn}} \ leq 20 $ gev，$ b_2 $随着能量的增加而大幅下降。计算证实，这是由于$ b_2 \ sim 1/v $中反映的冻结量增加所致。在较高的能量下，$ \ sqrt {s_ {nn}} \ geq 20 $ gev，$ b_2 $在恒定级别上饱和。这种质的变化和体积抑制的消失被证明是由于能量增加的强径向流动的发展所致。该流量导致强大的空间摩孔相关性，以抵消体积效应。
The deuteron coalescence parameter $B_2$ in proton+proton and nucleus+nucleus collisions in the energy range of $\sqrt{s_{NN}}=$ 900 - 7000 GeV for proton+proton and $\sqrt{s_{NN}}=$ 2 - 2760 GeV for nucleus+nucleus collisions is analyzed with the Ultrarelativistic Quantum Molecular Dynamics (UrQMD) transport model, supplemented by an event-by-event phase space coalescence model for deuteron and anti-deuteron production. The results are compared to data by the E866, E877, PHENIX, STAR and ALICE experiments. The $B_2$ values are calculated from the final spectra of protons and deuterons. At lower energies, $\sqrt{s_{NN}}\leq 20$ GeV, $B_2$ drops drastically with increasing energy. The calculations confirm that this is due to the increasing freeze-out volume reflected in $B_2\sim 1/V$. At higher energies, $\sqrt{s_{NN}}\geq 20$ GeV, $B_2$ saturates at a constant level. This qualitative change and the vanishing of the volume suppression is shown to be due to the development of strong radial flow with increasing energy. The flow leads to strong space-momentum correlations which counteract the volume effect.
