https://doi.org/10.1140/epja/i2017-12208-7
Regular Article - Theoretical Physics
Reanalysis of the X(3915) , X(4500) and X(4700) with QCD sum rules
Department of Physics, North China Electric Power University, 071003, Baoding, China
* e-mail: zgwang@aliyun.com
Received:
27
October
2016
Accepted:
12
January
2017
Published online:
6
February
2017
In this article, we study the 
type and 
type scalar 
tetraquark states with the QCD sum rules by calculating the contributions of the vacuum condensates up to dimension 10 in a consistent way. The ground state masses 
GeV and 
GeV support assigning the 
as the ground state type tetraquark state with 
, but do not support assigning the 
as the ground state type tetraquark state with . Then we tentatively assign the and 
as the 1S and 2S
type scalar tetraquark states respectively, and obtain the 1S mass 
GeV and 2S mass M
2S = 4.35+0.10
-0.11 GeV from the QCD sum rules, which support assigning the X(3915) as the 1S
type tetraquark state, but do not support assigning the X(4500) as the 2S
type tetraquark state.
© SIF, Springer-Verlag Berlin Heidelberg, 2017
