In the present work, we use three-body interaction formalism to investigate the $K$–multi-$\rho$ interactions. First, we reproduce the resonances $f_2(1270)$ and $K_1(1270)$ in the $\rho \rho$ and $\rho K$ two-body interactions, respectively, as the clusters of the fixed-center approximation. Then, we study the three-body $K–\rho \rho (f_2)$ and $\rho –\rho K(K_1)$ interactions with the fixed-center approximation of the Faddeev equations. Furthermore, we extrapolate the formalism to study the four-body, five-body, and six-body systems containing one $K$ meson and multiple $\rho$ mesons. In our research, without introducing any free parameters, we generate the $K_2(1770)$ state in the three-body interaction with the mass of 1707 MeV and a width about 113 MeV, which are consistent with the experiments. We also find a clear resonant structure in our results of the five-body interaction, with a mass 2505 MeV and a width about 32 MeV or more, which is associated with the $K_4(2500)$ state, where we obtain consistent results with the experimental findings. Furthermore, we predict some new states in the other many-body interactions, $K_3(2080)$, $K_5(2670)$ (isospin $I=1/2$), and $K_4(2640)$ (isospin $I=3/2$), with uncertainties.

• Received 6 February 2015

DOI:https://doi.org/10.1103/PhysRevD.92.054011