https://doi.org/10.1140/epjc/s10052-017-4640-0
Regular Article - Theoretical Physics
Scalar tetraquark state candidates: X(3915), X(4500) and X(4700)
Department of Physics, North China Electric Power University, Baoding, 071003, People’s Republic of China
* e-mail: zgwang@aliyun.com
Received:
6
December
2016
Accepted:
20
January
2017
Published online:
7
February
2017
In this article, we tentatively assign the X(3915) and X(4500) to be the ground state and the first radial excited state of the axialvector–diquark–axialvector–antidiquark type scalar 
tetraquark states, respectively, assign the X(4700) to be the ground state vector–diquark–vector–antidiquark type scalar tetraquark state, and study their masses and pole residues with the QCD sum rules in detail by calculating the contributions of the vacuum condensates up to dimension 10. The numerical results support assigning the X(3915) and X(4500) to be the ground state and the first radial excited state of the axialvector–diquark–axialvector–antidiquark type scalar tetraquark states, respectively, and assigning the X(4700) to be the ground state vector–diquark–vector–antidiquark type scalar tetraquark state.
© The Author(s), 2017
