核介质中奇异矢量介子的电磁结构
Electromagnetic structure of strange vector mesons in nuclear medium
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中文总结 AI 辅助
本文在NJL模型中研究核物质内$K^{*+}$介子的电磁形状因子，发现其随密度增加而抑制，并给出正常密度下电荷半径$0.74$ fm，略小于$\ ho^+$介子。
中文摘要 AI 辅助
我们在Schwinger固有时间Nambu-Jona-Lasinio (NJL)模型中，研究了对称核物质中零温下带正电矢量介子$K^{*+}$的电荷（电）$G_C^{*}(Q^2)$、磁$G_M^{*}(Q^2)$和四极$G_Q^{*}(Q^2)$形状因子的介质内修正。在该框架下，核介质效应和$K^{*+}$介子的电磁结构都在夸克层面由NJL模型一致地描述。我们发现，电荷、磁和四极形状因子随核密度的增加而受到抑制，表明奇异矢量介子内部结构存在显著的介质内修正。我们还得到在正常核密度下电荷半径$r_{K^{*+}}^{*}=0.74~\text{fm}$，略小于$\rho^{+}$介子的对应值$r_{\rho^{+}}^{*}\backsimeq0.75~\text{fm}$。
英文摘要
We investigate the in-medium modifications of the charge (electric) $G_C^{*}(Q^2)$, magnetic $G_M^{*}(Q^2)$, and quadrupole $G_Q^{*}(Q^2)$ form factors of the positively charged vector meson $K^{*+}$ in symmetric nuclear matter at zero temperature within the Schwinger proper-time Nambu-Jona-Lasinio (NJL) model. In this framework, both the nuclear medium effects and the electromagnetic structure of the $K^{*+}$ meson are described consistently in the NJL model at the quark level. We find that the charge, magnetic, and quadrupole form factors are suppressed with increasing nuclear density, indicating substantial in-medium modifications of the strange vector meson's internal structure. We further obtain a charge radius of $r_{K^{*+}}^{*}=0.74~\mathrm{fm}$ at normal nuclear density, which is slightly smaller than the corresponding value for the $ρ^{+}$ meson, $r_{ρ^{+}}^{*}\simeq0.75~\mathrm{fm}$.
发表机构
- Hiroshima University（广岛大学）
- Universitas Indonesia（印度尼西亚大学）
- Universidade Cidade de São Paulo（圣保罗城市大学）
机构由 AI 辅助整理，请以论文原文为准。
