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arXiv · 2610.39245

Effects of the $a_0(980)$ Meson on Finite Nuclei in a Parity Doublet Model

Yuk Kei Kong·Youngman Kim·Masayasu Harada
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Abstract

We investigate nuclear structure within the parity doublet model (PDM), with particular emphasis on the role of the isovector-scalar $a_0(980)$ meson. We adopt the models with and without the $a_0$ meson and fit their parameters to nuclear matter saturation and ground state properties of selected nuclei, subject to constraints from the vacuum. The resulting parameter sets reproduce the nuclear matter saturation properties and provide a good description of binding energies and charge radii of selected nuclei. Our fits show that a large value of the chiral invariant mass of nucleon is preferred by the fitting: the best fitted value is $m_0 = 689 \pm 71 $ MeV with $a_0$ and $m_0 = 689 \pm 69 $ MeV without $a_0$. We find that the effects of the $a_0$ meson on the binding energies and charge radii are negligibly small. It is difficult to clarify the effect of $a_0$ meson to neutron skin thickness of Sn, Pb, and Ca isotopes, due to the large uncertainty of the predictions. We note that our prediction of $^{208} \text{Pb}$ is consistent with the measurement by PREX-II collaboration, while that of $^{48} \text{Ca}$ cannot explain the CREX result.

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Yuk Kei Kong, Youngman Kim, Masayasu Harada. 2026-10-29. Effects of the $a_0(980)$ Meson on Finite Nuclei in a Parity Doublet Model. https://arxiv.org/abs/2610.39245

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