Strong two-body decays of the S -wave Ds+Ds− molecule state

The decay behaviors of the Ds+Ds− molecule state have been studied in an effective Lagrangian approach. We find that the Ds+Ds− molecule state dominantly decays into DD¯ and ηcηηcη. The total and partial widths are strongly dependent on the model parameter, however, the ratio of the partial widths for ηcηηcη and DD¯ is relatively stable and predicted to be about 0.17∼0.220.17∼0.22. In addition, our evaluation shows that the partial width for the Ds+Ds− molecule to J/ψωJ/ψω is too small to be observed, thus the charmonium-like state X(3915)X(3915) should not be a Ds+Ds− molecule state.