Dynamically generated states from the $\eta K^*\bar{K}^*$, $\pi K^*\bar{K}^*$, and $K K^*\bar{K}^*$ systems within the fixed-center approximation

TL;DR

This study investigates three-body meson systems using fixed-center approximation, revealing resonance structures around 2100 MeV and 1890 MeV that correspond to known mesons like $ ext{pi}(2070)$ and $ ext{eta}_2(1870)$, suggesting possible new hadron states.

Contribution

It applies the fixed-center approximation to three-meson systems with chiral unitary interactions, identifying potential new resonance states related to known mesons.

Findings

Resonance around 2100 MeV linked to $ ext{pi}(2070)$

Resonance around 1890 MeV associated with $ ext{eta}_2(1870)$

Additional structures related to $ ext{pi}_2(1880)$ and $ ext{eta}(2010)$

Abstract

The three-body systems $\eta K^* \bar{K}^*$, $\pi K^* \bar{K}^*$, and $K K^* \bar{K}^*$ are further investigated within the framework of fixed-center approximation, where $K^* \bar{K}^*$ is treated as the fixed-center, corresponding to the possible scalar meson $a_0(1780)$ or the tensor meson $f_2'(1525)$. The interactions between $\eta$, $\pi$, $K$, and $K^*$ are taken from the chiral unitary approach. The resonance structures appear in the modulus squared of the three-body scattering amplitude and suggest that $\eta / \pi / K$-$(K^*\bar{K}^*)_{a_0(1780)/f'_2(1525)}$ hadron state can be formed. By scattering the $\eta$ meson on the fixed-center $(K^* \bar{K}^*)_{a_0(1780)}$, it is found that there is a distinct peak around 2100 MeV, as shown in the modulus squared of the three-body scattering amplitude, which can be associated with the meson $\pi(2070)$. For the scattering of the $\eta$ meson on the $(K^* \bar{K}^*)_{f_2'(1525)}$, a resonance structure around 1890 MeV is found and it can be associated with the $\eta_2(1870)$ meson. Other resonance structures are also found and can be associated with $\pi_2(1880)$ and $\eta(2010)$.