Signature of an $h_1$ state from $J/\psi \to \eta K^{\ast 0}{\bar{K}}^{\ast 0}$ and theoretical description of the $Z_c(3900)$ and $Z_c(4020)$ as $D{\bar{D}}^{\ast }$ and $D^{\ast }{\bar{D}}^{\ast }$ molecular states

E. Oset, J. J. Xie, M. Albaladejo +11

In this talk we address two topics: The first one is an empirical explanation in terms of a new state $h_1$ of the peak in the $K^{\ast 0}{\bar{K}}^{\ast 0}$ invariant mass distribution clos…