论文标题
$ \ sqrt {s_ {nn}} $ = 7.7-200 GEV的Au+Au碰撞中奇怪的夸克密度波动的研究
Study of strange quark density fluctuations in Au+Au Collisions at $\sqrt{s_{NN}}$ = 7.7-200 GeV from AMPT Model
论文作者
论文摘要
奇怪的产生是研究QCD相图的重要重要性。奇怪的夸克的产量比有助于搜索QCD临界终点（CEP）和/或一阶相变。在这项工作中，我们研究了$ k^{\ pm} $的生产，$ξ^ - （\barξ^{+}）$，$ ϕ $和$λ（\barλ）$在{\ auau}碰撞中{具有字符串熔化版本（AMPT-SM）的多相传输模型。与早期研究中报道的参数相比，我们使用不同的参数计算了这些奇怪的黑标本的不变收益率，并且还通过在AMPT-SM模型中改变了Hadronic Cascade时间（$ t_ {max} $）。 We also calculated the yield ratios, $\mathcal{O}_{K^{\pm}-Ξ^{-}(\bar Ξ^{+})-ϕ-Λ(\bar Λ)}$ which are reported as sensitive to the strange quark density fluctuations and found that the AMPT-SM model fails to describe the non-monotonic trend observed by the experimental data.发现负颗粒比高于与实验数据一致的正颗粒之比。通过改变$ t_ {max} $，对这些比率也有显着效果。对于Quark-Gluon等离子体（QGP）和HADRONIC物质之间的交叉跃迁，基于AMPT-SM模型的研究中考虑的双收益比没有显示出任何非单调性行为行为，因此为CEP搜索提供了基线，因为在AMPT模型中没有一阶或二阶过渡。重型离子碰撞仍然需要基于状态的动力建模的更现实的方程式，以便提取有关非单调能量依赖性行为的明确的物理结论。
The strangeness production is an important observable to study the QCD phase diagram. The yield ratios of strange quark can be helpful to search for the QCD critical end point (CEP) and/or first-order phase transition. In this work, we studied the production of $K^{\pm}$, $Ξ^-(\barΞ^{+})$, $ϕ$ and $Λ(\bar Λ)$ in {\auau} collisions at {\sqrtsNN} = 7.7, 11.5, 14.5, 19.6, 27, 39, 54.4, 62.4, and 200 GeV from A Multi-Phase Transport model with string melting version (AMPT-SM). We calculated the invariant yield of these strange hadrons using a different set of parameters compared to those reported in earlier studies and also by varying the hadronic cascade time ($t_{max}$) in the AMPT-SM model. We also calculated the yield ratios, $\mathcal{O}_{K^{\pm}-Ξ^{-}(\bar Ξ^{+})-ϕ-Λ(\bar Λ)}$ which are reported as sensitive to the strange quark density fluctuations and found that the AMPT-SM model fails to describe the non-monotonic trend observed by the experimental data. The negative particle ratio are found to be higher than the ratio of positive particles which is consistent with the experimental data. A significant effect is also seen on these ratios by varying the $t_{max}$. For a crossover transition between the Quark-Gluon Plasma (QGP) and hadronic matter, the double yield ratios considered in the present study based on AMPT-SM model do not show any non-monotonic behaviors and thus providing a baseline for the search of CEP, because there is no first-order or second-order phase transition in the AMPT model. The more realistic equation of state based dynamical modeling is still required for the heavy-ion collisions in order to extract the definite physics conclusion about the non-monotonic energy dependence behavior.
