https://doi.org/10.1140/epjc/s10052-017-5514-1
Regular Article - Theoretical Physics
The decay width of the 
as an axialvector tetraquark state in solid quark–hadron duality
Department of Physics, North China Electric Power University, Baoding, 071003, People’s Republic of China
* e-mail: zgwang@aliyun.com
Received:
28
November
2017
Accepted:
28
December
2017
Published online:
11
January
2018
In this article, we tentatively assign the 
to be the diquark–antidiquark type axialvector tetraquark state, study the hadronic coupling constants 
with the QCD sum rules in details. We take into account both the connected and disconnected Feynman diagrams in carrying out the operator product expansion, as the connected Feynman diagrams alone cannot do the work. Special attentions are paid to matching the hadron side of the correlation functions with the QCD side of the correlation functions to obtain solid duality, the routine can be applied to study other hadronic couplings directly. We study the two-body strong decays 
and obtain the total width of the . The numerical results support assigning the to be the diquark–antidiquark type axialvector tetraquark state, and assigning the 
to be the meson–meson type axialvector molecular state.
© The Author(s), 2018
