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In this talk we address two topics: The first one is an empirical explanationin terms of a new state $h_1$ of the peak in the $K^{*0}\bar{K}^{*0}$ invariantmass distribution close to threshold of this channel in the $J/\psi \to \etaK^{*0}\bar{K}^{*0}$ decay. The second one is a theoretical description of theisospin $I=1$ $Z_c(3900)$ and $Z_c(4020)$ states in terms of molecular statesof $D \bar D^*+ cc$ and $D^* \bar D^*$.

epj web of conferences

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