https://doi.org/10.1140/epjc/s10052-018-5989-4
Regular Article - Theoretical Physics
Possible pentaquark candidates: new excited 
states
Department of Physics, North China Electric Power University, Baoding, 071003, People’s Republic of China
* e-mail: zgwang@aliyun.com
** e-mail: zgwang@ncepu.edu.cn
Received:
17
April
2018
Accepted:
11
June
2018
Published online:
18
June
2018
In this article, we study the axialvector-diquark–scalar-diquark–antiquark type charmed pentaquark states with 
with the QCD sum rules by carrying out the operator product expansion up to the vacuum condensates of dimension 13 in a consistent way. In calculations, we separate the contributions of the negative parity and positive parity pentaquark states unambiguously, and choose three sets input parameters to study the masses and pole residues of the charmed pentaquark states 
and 
in details. Then we estimate the masses of the charmed pentaquark states 
, 
, 
and 
with 
to be 
according to the SU(3) breaking effects, which is compatible with the 
, 
, 
, 
.
© The Author(s), 2018
