Abstract
Motivated by the analogous properties of and , we tentatively assign as the -type hidden-charm tetraquark state with , where A denotes the axialvector diquark states, and explore -type tetraquark states without strange, with strange, and with hidden-strange via QCD sum rules in a consistent manner. We then explore the hadronic coupling constants in the two-body strong decays of tetraquark states without and with strange via QCD sum rules based on rigorous quark-hadron duality and acquire partial and total decay widths. The present calculations support assigning as the -type tetraquark state with , while the predictions for its strange cousin state can be confronted with experimental data in the future.
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