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arXiv 1705.07548nucl-th
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从手征对称性部分恢复的观点重新审视$K^+$ -核弹性散射

$K^+$-nucleus elastic scattering revisited from perspective of partial restoration of chiral symmetry

Kenji Aoki, Daisuke Jido

发表信息：
Prog. Theor. Exp. Phys., 2017, 103D01
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摘要：

通过波函数重整化研究了核介质中$K^{+}$介子的性质，揭示了部分恢复手征对称性条件下$K^{+}$介子的介质内性质.利用手征微扰理论构造了$K^{+}N$的弹性散射振幅，直到次主导阶。利用所构造的振幅，我们计算了波函数在高斯-费米近似下的重整化。我们得到了一个很好的描述的$K^{+}N$弹性散射振幅。得到的波函数重整化因子表明，在饱和密度下，$K^{+}N$相互作用增强了2 ~ 6%。我们认为波函数重整化可能是$K^{+}$介子的重要介质效应之一。

英文摘要：

The $K^{+}$ meson properties in the nuclear medium are investigated by considering the wavefunction renormalization as a first step to reveal the in-medium properties of the $K^{+}$ meson in the context of partial restoration of chiral symmetry. The $K^{+}N$ elastic scattering amplitude is constructed using chiral perturbation theory up to the next-to-leading order. Using the constructed amplitude, we calculate the wavefunction renormalization in the Thomas-Fermi approximation. We obtained a good description of the $K^{+}N$ elastic scattering amplitude. The obtained wavefunction renormalization factor suggests the 2 to 6% enhancement of the $K^{+}N$ interaction at the saturation density. We conclude that the wavefunction renormalization could be one of the important medium effects for the $K^{+}$ meson.

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