Production characteristics of light (anti-)nuclei from (anti-)nucleon coalescence in heavy ion collisions at energies employed at the RHIC beam energy scan
Production characteristics of light (anti-)nuclei from (anti-)nucleon coalescence in heavy ion collisions at energies employed at the RHIC beam energy scan
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DOI：
10.1103/physrevc.105.054908
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发表时间：
2022-01
影响因子：
3.1
通讯作者：
Xianghu Zhao;Yanan Feng;Feng-lan Shao;Rui-Qin Wang;Jun Song
中科院分区：
文献类型：
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作者：
Xianghu Zhao;Yanan Feng;Feng-lan Shao;Rui-Qin Wang;Jun Song
利用夸克组合模型获得的动力学冻结核子和反核子，我们研究了相对论重离子碰撞中（反）核子聚结机制中轻核和反核的产生。我们推导了不同轻核动量分布的解析公式，并将其应用于计算 $\sqrt{s_{NN}}=$7.7, 11.5, 19.6, 27 处 Au-Au 碰撞中（反）氘核 ($d$, $\bar d$) 和（反）氚核 ($t$, $\bar t$) 的横向动量 ($p_T$) 谱， 39, 54.4 GeV。我们发现这些$p_T$光谱可用的实验数据可以很好地重现。我们进一步研究了不同轻（反）核的产率和产率比，并自然地解释了它们作为碰撞能量函数的有趣行为。我们特别指出，多粒子产率比 $tp/d^2$ 应根据质子的超子弱衰变仔细修正，以探测轻核的产生特征。我们所有的结果都表明，（反）核子的聚结机制对于在 RHIC 光束能量扫描能量下轻核和反核的产生起着主导作用。
With the kinetic freeze-out nucleons and antinucleons obtained from the quark combination model, we study the production of light nuclei and antinuclei in the (anti-)nucleon coalescence mechanism in relativistic heavy ion collisions. We derive analytic formulas of the momentum distributions of different light nuclei and apply them to compute transverse momentum ($p_T$) spectra of (anti-)deuterons ($d$, $\bar d$) and (anti-)tritons ($t$, $\bar t$) in Au-Au collisions at $\sqrt{s_{NN}}=$7.7, 11.5, 19.6, 27, 39, 54.4 GeV. We find that the experimental data available for these $p_T$ spectra can be well reproduced. We further study the yields and yield ratios of different light (anti-)nuclei and naturally explain their interesting behaviors as a function of the collision energy. We especially point out that the multi-particle yield ratio $tp/d^2$ should be carefully corrected from hyperon weak decays for protons to probe the production characteristics of light nuclei. All of our results show that the coalescence mechanism for (anti-)nucleons plays a dominant role for the production of light nuclei and antinuclei at the RHIC beam energy scan energies.