https://doi.org/10.1140/epjc/s10052-017-5409-1
Regular Article - Theoretical Physics
Revisit assignments of the new excited 
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:
25
August
2017
Accepted:
22
November
2017
Published online:
6
December
2017
In this article, we distinguish the contributions of the positive parity and negative parity states, study the masses and pole residues of the 1S, 1P, 2S and 2P states with the spin 
and 
using the QCD sum rules in a consistent way, and we revisit the assignments of the new narrow excited 
states. The predictions support assigning 
to the 1P state with 
, assigning 
to the 1P state with 
or the 2S state with 
, and assigning 
to the 2S state with 
.
© The Author(s), 2017
