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

Abstract

We investigate the $\eta \bar{K}{K}^{\ast }$ 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 $\bar{K}{K}^{\ast }$, which is known to generate the $f_1(1285)$, or a $\bar{K}$ on a clusterized system $\eta K^{\ast }$, which is shown to generate the $K_1(1270)$. In the case of the $\eta$-$(\bar{K}{K}^{\ast }{)}_{f_1(1285)}$ 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 $\bar{K}$-$(\eta K^{\ast }{)}_{K_1(1270)}$ 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.

Comments: 7 pages, 8 figures, published version