Hidden-Charm Tetraquarks and Charged Zc States

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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 Zc(3900), Zc(4025) and Zc(4200) within the axial vector tetraquark spectrum simultaneously. Not all these three states are tetraquark candidates. Moreover, the eigenvector of the chromomagnetic interaction contains valuable information of the decay pattern of the tetraquark states. The dominant decay mode of the lowest axial vector tetraquark state is J/ψπ while its D*D and D*D* modes are strongly suppressed, which is in contrast with the fact that the dominant decay mode of Zc(3900) and Zc(4025) is DD* and D*D* respectively. We emphasize that all the available experimental information indicates that Zc(4200) is a very promising candidate of the lowest axial vector hidden-charm tetraquark state.