热密核物质中$D_{s0}^*(2317)^\frac{+}{}$的性质
Properties of the $D_{s0}^*(2317)^\pm$ in hot and dense nuclear matter
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中文总结 AI 辅助
本研究利用基于次领头阶重介子手征微扰论的耦合道分子模型，探究热密核物质中$D_{s0}^*(2317)^\frac{+}{}$的性质，发现正反粒子介质行为的差异可用于约束这类奇特强子态的内部结构。
中文摘要 AI 辅助
我们采用基于次领头阶重介子手征微扰理论构建的耦合道分子模型，研究了热密核物质中$D_{s0}^*(2317)^\frac{+}{}$的性质。核介质对$D_{s0}^*(2317)^+$的修正源于耦合的$DK$-$D_sη$系统中$DK$道的变化。随着核密度升高，$D_{s0}^*(2317)^+$准粒子峰向低能方向移动且宽度展宽，其变化趋势与$D$介子谱函数的行为一致。温度效应相对温和：费米面的热展宽以及$D$介子谱函数中$Σ_c N^{-1}$激发的熔解，会使$D_{s0}^*(2317)^+$的峰位向自由空间质量回迁，同时宽度收窄。与之相对，$D_{s0}^*(2317)^-$的行为由$\bar{D}\bar{K}$道主导，其介质中的演化由$\bar{K}$介子谱函数驱动。随温度升高，$D_{s0}^*(2317)^-$的质量也趋近于自由空间值，但其宽度先展宽，在高温下趋于饱和。将由π介子衰变常数的密度和/或温度变化驱动的显式介质依赖效应纳入相互作用核后，$D_{s0}^*(2317)^+$的质量会进一步降低，且宽度随温度收窄；对于$D_{s0}^*(2317)^-$，其质量同样随温度下降，但宽度会增大。这些截然不同的介质行为为约束这类奇特态的内部结构提供了一条颇具前景的途径。
英文摘要
We investigate the properties of the $D_{s0}^\ast(2317)^\pm$ in hot and dense nuclear matter using a coupled-channel molecular model built on next-to-leading-order heavy meson chiral perturbation theory. In-medium modifications to the $D_{s0}^\ast(2317)^+$ stem from changes to the $DK$ channel within the coupled $DK$-$D_s η$ system. As nuclear density increases, the $D_{s0}^\ast(2317)^+$ quasiparticle peak shifts toward lower energies and broadens, tracking the behavior of the $D$-meson spectral function. As for temperature effects, those are milder, with the thermal smearing of the Fermi surface and the melting of $Σ_c N^{-1}$ excitations in the $D$-meson spectral function shifting the $D_{s0}^\ast(2317)^+$ peak back toward its free-space mass while narrowing it. Conversely, the behavior of the $D_{s0}^\ast(2317)^-$ is governed by the $\bar D \bar K$ channel and its medium behavior is driven by the $\bar K$ spectral function. With increasing temperature, the $D_{s0}^\ast(2317)^-$ also approaches its free-space mass, but its width broadens before saturating at high temperatures. Incorporating explicit medium dependencies into the interaction kernel, driven by density and/or temperature variations in the pion decay constant, further shifts the $D_{s0}^\ast(2317)^+$ mass lower and narrows its width with temperature. As for $D_{s0}^\ast(2317)^-$, its mass also drops with temperature but its width increases. These contrasting medium behaviors offer a promising pathway to constrain the internal structure of these exotic states.
