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arXiv 2001.09356hep-phhep-exhep-lat
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冷核物质中$Z_c(3900)$四夸克态的性质

Properties of $Z_c(3900)$ tetraquark in a cold nuclear matter

K. Azizi, N. Er

备注：
13 Pages, 7 Figures and 2 Tables. Some typos were corrected
发表信息：
Phys. Rev. D 101, 074037 (2020)
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摘要：

研究介质对核物质中粒子性质的影响，对于理解夸克-胶子的本质和内部结构，以及精确确定量子数，特别是奇异态的量子数具有重要意义。在这种情况下，我们研究的物理性质之一的著名的charmonium类状态，$Z_c(3900)$，在一个冷的致密物质。利用介质求和规则研究了饱和密度下的稠密介质$ ρ^{sat} $对$Z_c(3900)$态质量和流介子耦合的影响.我们还估计了饱和核物质密度下该态的矢量自能。我们讨论了这种状态的光谱参数的行为相对于密度高达一个高密度对应的核心的中子星，$ρ\approx 5ρ^{sat}$。这种状态的质量和电流耦合都表现出非线性行为，并且随着介质密度的增加而减小：当使用辅助参数和其他输入参数的中心值时，质量在$ ρ=5ρ^{sat} $处达到其真空值的大致$30\%$，而电流耦合在$ ρ\approx2.1ρ^{sat} $处接近零。

英文摘要：

The study of medium effects on properties of particles embedded in nuclear matter is of great importance for understanding the nature and internal quark-gluon organization as well as exact determination of the quantum numbers, especially of the exotic states. In this context, we study the physical properties of one of the famous charmonium-like states, $Z_c(3900)$, in a cold dense matter. We investigate the possible shifts in the mass and current-meson coupling of the $Z_c(3900)$ state due to the dense medium at saturation density, $ ρ^{sat} $, by means of the in-medium sum rules. We also estimate the vector self-energy of this state at saturation nuclear matter density. We discuss the behavior of the spectroscopic parameters of this state with respect to the density up to a high density corresponding to the core of neutron stars, $ρ\approx 5ρ^{sat}$. Both the mass and current-coupling of this state show nonlinear behavior and decrease with respect to the density of the medium: the mass reaches roughly $30\%$ of its vacuum value at $ ρ=5ρ^{sat} $, while the current-coupling approaches zero at $ ρ\approx2.1ρ^{sat} $, when the central values of the auxiliary and other input parameters are used.

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