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arXiv 2102.00192nucl-thhep-ph
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$η$ 介子在热磁化核物质中的行为

$η$ mesons in hot magnetized nuclear matter

Rajesh Kumar, Arvind Kumar

AI总结:

该研究利用手征SU(3)模型与手征微扰论,在热磁化非对称核物质中研究$ηN$相互作用,发现磁场显著影响$η$介子介质内性质,且联合方法比单独模型产生更大质量移动,但$η$介子不带电故无额外质量移动。

摘要:

利用手征SU(3)模型和手征微扰论(ChPT)研究了热磁化非对称核物质中的$ηN$相互作用。在手征模型中,通过外部磁场影响下的介质修正标量密度计算了$η$介子的介质内性质。进一步地,在手征模型与ChPT的联合方法中,从ChPT有效$ηN$拉氏量评估了$ηN$相互作用的离壳贡献,而介质内标量密度的效应则从手征SU(3)模型引入。我们观察到磁场对$η$介子的介质内质量和光学势有显著影响。与单独使用手征SU(3)模型相比,在ChPT与手征模型的联合方法中观察到更大的质量移动。在两种方法中,由于$η$介子不带电,在磁场存在下未观察到额外的质量移动。

英文摘要:

The $ηN$ interactions are investigated in the hot magnetized asymmetric nuclear matter using chiral SU(3) model and chiral perturbation theory (ChPT). In the chiral model, the in-medium properties of $η$-meson are calculated by the medium modified scalar densities under the influence of an external magnetic field. Further, in the combined approach of chiral model and ChPT, off-shell contributions of $ηN$ interactions are evaluated from the ChPT effective $ηN$ Lagrangian, and the in-medium effect of scalar densities are incorporated from the chiral SU(3) model. We observe a significant effect of magnetic field on the in-medium mass and optical potential of $η$ meson. We observe a deeper mass-shift in the combined approach of ChPT and chiral model compared to the effect of solo chiral SU(3) model. In both approaches, no additional mass-shift is observed due to the uncharged nature of $η$ mesons in the presence of magnetic field.

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