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arXiv 1909.00716hep-phhep-exhep-lat
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真空和热介质中的轻标量$K_{0}^{*}(700)$介子

Light scalar $K_{0}^{*}(700)$ meson in vacuum and a hot medium

K. Azizi, B. Barsbay, H. Sundu

备注：
8 Pages, 3 Figures and 2 Tables, Accepted version
发表信息：
Phys. Rev. D 100, 094041 (2019)
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摘要：

$K_{0}^{*}(700)$介子是PDG中最轻的奇异标量介子。虽然有很多实验和理论上的努力来建立这种粒子并确定其性质和性质，但它仍然需要在实验中得到证实，其内部的夸克-胶子组织需要澄清。在这方面，我们研究了这种状态在热介质以及真空中的光谱特性，通过模拟它作为一个夸克和一个反夸克的通常介子。特别是，我们调查它的质量和耦合或衰变常数的热介质的温度，包括由费米子和胶子部分的能量动量张量的介质效应，以及温度依赖的连续阈值，夸克，胶子和混合凝聚。我们观察到，$K_{0}^{*}(700)$的质量在达到$T \simeq 0.6 ~ T_c$之前保持不变，其中$ T_c $为临界温度，但在此点之后它开始减小，并在接近临界温度（指的是介子的熔化）时接近零。在较高温度下，$K_{0}^{*}(700)$的偶联对$ T $也敏感。在$T \simeq 0.85 ~ T_c$之后开始快速增长。我们关闭介质效应，并计算在零温度下的$K_{0}^{*}(700)$状态的质量和耦合。所得质量与PDG报道的平均Breit-Wigner质量值一致。

英文摘要：

The $K_{0}^{*}(700)$ meson appears as the lightest strange scalar meson in PDG. Although there were a lot of experimental and theoretical efforts to establish this particle and determine its properties and nature, it still needs confirmation in an experiment and its internal quark-gluon organization needs to be clarified. In this connection, we study some spectroscopic properties of this state in a hot medium as well as a vacuum by modeling it as a usual meson of a quark and an aniquark. In particular, we investigate its mass and coupling or decay constant in terms of the temperature of a hot medium by including the medium effects by the fermionic and gluonic parts of the energy momentum tensor as well as the temperature-dependent continuum threshold, quark, gluon and mixed condensates. We observe that the mass of $K_{0}^{*}(700)$ remains unchanged up to $T \simeq 0.6 ~ T_c$ with $ T_c $ being the critical temperature, but it starts to diminish after this point and approaches zero near to the critical temperature referring to the melting of the meson. The coupling of $K_{0}^{*}(700)$ is also sensitive to $ T $ at higher temperatures. It starts to grow rapidly after $T \simeq 0.85 ~ T_c$. We turn off the medium effects and calculate the mass and coupling of the $K_{0}^{*}(700)$ state at zero temperature. The obtained mass is in accord with the average Breit-Wigner mass value reported by PDG.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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