Molecular states with hidden charm and strange in QCD Sum Rules

Abstract

This work uses the QCD Sum Rules to study the masses of the $D_s{\bar{D}}_s^{\ast }$ and $D_s^{\ast }{\bar{D}}_s^{\ast }$ molecular states with quantum numbers $J^{PC}=1^{+-}$. Interpolating currents with definite C-parity are employed, and the contributions up to dimension eight in the Operator Product Expansion (OPE) are taken into account. The results indicate that two hidden strange charmonium-like states may exist in the energy ranges of $3.83\sim 4.13$ GeV and $4.22\sim 4.54$ GeV, respectively. The hidden strange charmonium-like states predicted in this work may be accessible in future experiments, e.g. BESIII, BelleII and SuperB. Possible decay modes, which may be useful in further research, are predicted.

Comments: 15 pages, 6 figures, 2 tables, to appear in EPL