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: email@example.com
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