https://doi.org/10.1140/epjc/s10052-014-2963-7
Regular Article - Theoretical Physics
Reanalysis of the 
, 
, 
, 
, and 
as molecular states with QCD sum rules
Department of Physics, North China Electric Power University, Baoding , 071003, People’s Republic of China
* e-mail: zgwang@aliyun.com
Received:
17
May
2014
Accepted:
1
July
2014
Published online:
23
July
2014
In this article, we calculate the contributions of the vacuum condensates up to dimension 10 in the operator product expansion, and study the 
, 
, 
, 
, 
, 
molecular states with the QCD sum rules. In the calculations, we use the formula 
to determine the energy scales of the QCD spectral densities. The numerical results favor assigning the and to the , or
molecular states, the to the
molecular state, the to the 
molecular state, and they disfavor assigning the to the () molecular state. The present predictions can be confronted with the experimental data in the future.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
