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