https://doi.org/10.1140/epjc/s10052-014-2810-x
Regular Article - Theoretical Physics
Interpretation of 
as the hidden charm tetraquark states via QCD Sum Rules
1
School of Physics, Graduate University of Chinese Academy of Sciences, YuQuan Road 19A, 100049 , Beijing, China
2
CAS Center for Excellence in Particle Physics, Beijing, China
* e-mail: tangl@ucas.ac.cn
Received:
13
January
2014
Accepted:
4
March
2014
Published online:
18
March
2014
By using QCD Sum Rules, we found that the charged hidden charm tetraquark 
states with 
and 
, which are possible quantum numbers of the newly observed charmonium-like resonance , have masses of 
and 
. The contributions up to dimension eight in the operator product expansion were taken into account in the calculation. The tetraquark mass of 
state was consistent with the experimental data of , suggesting the state to possess the quantum number of 
. Extending to the b-quark sector, the corresponding tetraquark masses 
and 
were obtained, which values are testable in future B-factories.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
