Interpretation of X(3960) as the hidden charm-strange tetraquark states via QCD sum rules

Abstract

Recently, a hadronic state, named X(3960), about 3.96 GeV with JPC=0++ was observed in LHCb experiment. From its the decay modes, it's reasonable to categorize this structure to novel hadronic state. In this paper, we examine the tetraquark interpretation for the structure of X(3960) in the configurations of [3c]cs⊗[3¯c]c¯s¯, and the QCD sum rules calculations of the mass spectrum are performing. Numerical results indicted that the observed X(3900) could be embedded into the [3c]cs⊗[3¯c]c¯s¯ configuration. Various X(3960) decay modes are evaluated, which are critical for pinning down its configuration and left for experimental verification. In the same way, we evaluate as well the c¯qc¯q, b¯sb¯s, and b¯qb¯q tetraquark state with 0++ quantum number in the configuration of [3c]cs⊗[3¯c]c¯s¯ and find that there might exist six such ground states.