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arXiv 1703.05367nucl-thhep-exhep-phnucl-ex
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核物质和原子核中的$ϕ$介子质量和衰变宽度

$ϕ$ meson mass and decay width in nuclear matter and nuclei

J. J. Cobos-Martínez, K. Tsushima, G. Krein, A. W. Thomas

摘要:

用有效拉格朗日方法计算了冷核物质中$ϕ$介子的质量和衰变宽度。这些属性的介质依赖性得到评估K介子-反K介子回路的贡献$ϕ$自能,采用介质修改的K介子质量,使用夸克-介子耦合模型计算。用偶极形状因子正则化回路积分,并研究了结果对形状因子中截止质量选择的敏感性。在正常的核物质密度下,我们发现$ϕ$质量向下移动了几个百分点,而衰变宽度增加了一个数量级。对于截止质量参数的较大变化,$ϕ$质量和衰变宽度的结果变化很小。我们的研究结果支持文献中的结果,这表明,应该观察到一个小的向下的质量移动和大的加宽的衰变宽度。为了探索研究$ϕ$介子在核中的结合和吸收的可能性,我们还计算了几种原子核的单粒子结合能和$ϕ$ -核结合态的半宽度.

英文摘要:

The mass and decay width of the $ϕ$ meson in cold nuclear matter are computed in an effective Lagrangian approach. The medium dependence of these properties are obtained by evaluating kaon-antikaon loop contributions to the $ϕ$ self-energy, employing the medium-modified kaon masses, calculated using the quark-meson coupling model. The loop integral is regularized with a dipole form factor, and the sensitivity of the results to the choice of cutoff mass in the form factor is investigated. At normal nuclear matter density we find a downward shift of the $ϕ$ mass by a few percent, while the decay width is enhanced by an order of magnitude. For a large variation of the cutoff mass parameter, the results for the $ϕ$ mass and the decay width turn out to vary very little. Our results support results in the literature which suggest that one should observe a small downward mass shift and a large broadening of the decay width. In order to explore the possibility of studying the binding and absorption of $ϕ$ mesons in nuclei, we also present the single-particle binding energies and half-widths of $ϕ$-nucleus bound states for some selected nuclei.

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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