Hidden-Charm Tetraquarks and Charged Zc States

Understand

Experimentally several charged axial-vector hidden-charm states were reported.

• Within the framework of the color-magnetic interaction, we have systematically considered the mass spectrum of the hidden-charm and hidden-bottom tetraquark states.
• It is impossible to accommodate all the three charged states $Z_c(3900)$, $Z_c(4025)$ and $Z_c(4200)$ within the axial vector tetraquark spectrum simultaneously.
• Not all these three states are tetraquark candidates.