# Prediction of possible exotic states in the $\eta \bar{K}K^*$ system

## TL;DR

This paper predicts potential exotic meson states with specific quantum numbers by analyzing three-body interactions involving eta, K, and K* particles, using a fixed center approximation to the Faddeev equations.

## Contribution

It introduces a novel application of the fixed center approximation to predict exotic states in the eta-K-K* system, identifying possible bound states with specific quantum numbers.

## Key findings

- Evidence of a bound state around 1700 MeV with width 180 MeV.
- Another bound state near 1680 MeV with width 160 MeV.
- Identification of states with exotic quantum numbers in the meson spectrum.

## Abstract

We investigate the $\eta \bar{K}K^*$ three body system in order to look for possible $I^G(J^{PC})=0^+(1^{-+})$ exotic states in the framework of the fixed center approximation to the Faddeev equation. We assume the scattering of $\eta$ on a clusterized system $\bar{K}K^*$, which is known to generate the $f_1(1285)$, or a $\bar{K}$ on a clusterized system $\eta K^*$, which is shown to generate the $K_1(1270)$. In the case of the $\eta$-$(\bar{K}K^*)_{f_1(1285)}$ scattering, we find evidence of a bound state $I^G(J^{PC})=0^+(1^{-+})$ below the $\eta{f_1(1285)}$ threshold with mass around 1700 MeV and width about 180 MeV. Considering the $\bar{K}$-$(\eta K^*)_{K_1(1270)}$ scattering, we obtain a bound state $I(J^{P})=0(1^{-})$ just below the $\bar{K}{K_1(1270)}$ threshold with a mass around 1680 MeV and a width about 160 MeV.