https://doi.org/10.1140/epjc/s10052-016-4238-y
Regular Article - Theoretical Physics
Tetraquark state candidates: Y(4260), Y(4360), Y(4660), and 
Department of Physics, North China Electric Power University, Baoding, 071003, People’s Republic of China
* e-mail: zgwang@aliyun.com
Received:
18
May
2016
Accepted:
28
June
2016
Published online:
8
July
2016
In this article, we construct the axialvector-diquark–axialvector-antidiquark type tensor current to interpolate both the vector- and the axialvector-tetraquark states, then calculate the contributions of the vacuum condensates up to dimension 10 in the operator product expansion, and we obtain the QCD sum rules for both the vector- and the axialvector-tetraquark states. The numerical results support assigning the to be the 
diquark–antidiquark type tetraquark state, and assigning the Y(4660) to be the 
diquark–antidiquark type tetraquark state. Furthermore, we take the Y(4260) and Y(4360) as the mixed charmonium–tetraquark states, and we construct the two-quark–tetraquark type tensor currents to study the masses and pole residues. The numerical results support assigning the Y(4260) and Y(4360) to be the mixed charmonium–tetraquark states.
© The Author(s), 2016
