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The enigmatic charged states $Z_c(3900)$, $Z_c(4020)$, $Z_c(4050)$,$Z_b(10610)$, and $Z_b(10650)$ are studied within a coupled-channelSchr\"odinger model, where radially excited quark-antiquark pairs, with thesame angular momenta and isospin as the $a_1(1260)$ and $b_1(1235)$, arestrongly coupled to their Okubo-Zweig-Iizuka - allowed decay channels$D\bar{D}^*+\bar{D}D^*$ and $D^*\bar{D}^*$, or $B\bar{B}^*+\bar{B}B^*$ and$B^*\bar{B}^*$, in $S$ and $D$-wave. Poles, matching the experimental mass andwidth of all the above states, are found by varying only two free parameters.From the wave-function analysis of each resonance, the probability of each ofthe components contributing to the coupled system is estimated, and predictionscan be made for the relative decay fractions among the coupled open-charm oropen-bottom decay channels.

Radially excited axial mesons and the enigmatic $Z_c$ and $Z_b$ in a coupled-channel model