Revisiting [formula omitted] as a 0+ tetraquark state from QCD sum rules

Abstract

Stimulated by the renewed observation of Ds0⁎(2317) signal and its updated mass value 2318.3±1.2±1.2MeV/c2 in the process e+e−→Ds⁎+Ds0⁎(2317)−+c.c. by BESIII Collaboration, we devote to reinvestigate Ds0⁎(2317) as a 0+ tetraquark state from QCD sum rules. Technically, four different possible currents are adopted and high condensates up to dimension 12 are included in the operator product expansion (OPE) to ensure the quality of QCD sum rule analysis. In the end, we obtain the mass value 2.37−0.36+0.50GeV with the factorization parameter ρ=1 (or 2.23−0.24+0.78GeV with ρ=3) for the scalar–scalar current, which agrees well with the experimental data of Ds0⁎(2317) and could support its explanation as a 0+ scalar–scalar tetraquark state. The final result for the axial–axial configuration is calculated to be 2.51−0.43+0.61GeV with ρ=1 (or 2.52+0.76−0.52GeV with ρ=3), which is still consistent with the mass of Ds0⁎(2317) considering the uncertainty, and then the possibility of Ds0⁎(2317) as a axial–axial tetraquark state can not be excluded. For the pseudoscalar–pseudoscalar and the vector–vector cases, their unsatisfactory OPE convergence makes that it is of difficulty to find rational work windows to further acquire hadronic masses.