论文标题
$η$介子在热和密集的不对称核问题上
$η$ mesons in hot and dense asymmetric nuclear matter
论文作者
论文摘要
我们使用两种不同的方法研究了热和密集的异种核物质中的$ηn$相互作用。在第一种方法中，考虑到$ηn$相互作用lagrangian密度在手性su（3）模型中计算了$η$ - 米森的中等内势和光电位。在第二种情况下，采用了手性扰动理论和手性SU（3）模型的结合。在这种情况下，从手性扰动理论（CHPT）中评估了近代领先的$ηn$相互作用，并且标量密度的中等贡献是从手性SU（3）模型中以输入为输入的。与单独的手性SU（3）模型相比，我们观察到CHPT+手性模型方法中的负质量变量较大，这是核密度的函数。此外，不对称和温度的升高导致质量变化的幅度降低。我们还研究了$ηn$散射长度$ a^{ηn} $对$η$ meson质量$ m^*_η$的影响，并观察到$ m^*_η$减少了更多以增加散射长度的价值。
We study the $ηN$ interactions in the hot and dense isospin asymmetric nuclear matter using two different approaches. In the first approach, the in-medium mass and optical potential of $η$-meson have been calculated in the chiral SU(3) model, considering the effect of explicit symmetry breaking term and range terms in the $ηN$ interaction Lagrangian density. In the second scenario, the conjunction of chiral perturbation theory and chiral SU(3) model is employed. In this case, the next-to-leading order $ηN$ interactions are evaluated from the chiral perturbation theory (ChPT), and the in-medium contribution of scalar densities are taken as input from chiral SU(3) model. We observe a larger negative mass-shift in the ChPT+chiral model approach compared to the chiral SU(3) model alone as a function of nuclear density. Moreover, the increase in the asymmetry and temperature cause a decrease in the magnitude of mass-shift. We have also studied the impact of $ηN$ scattering length $a^{ηN}$ on the $η$ meson mass $m^*_η$ and observed that the $m^*_η$ decrease more for increasing the value of scattering length.
