Abstract
Stimulated by the new evidence of Y(4274) observed in the J/ψϕ invariant mass spectrum, we first propose the charmonium-like state Y(4274) as the S-wave DsD¯s0(2317)+h.c. molecular state with JP=0−, which is supported well by dynamics study of the system composed of the pseudoscalar and scalar charmed mesons. The S-wave DD¯0(2400)+h.c. molecular charmonium appears as the molecular partner of Y(4274), which is in accord with the enhancement structure appearing at 4.2 GeV in the J/ψω invariant mass spectrum from B decays. Our study shows that the enhancement structures, i.e., the newly observed Y(4274) and the previously announced Y(4140)/Y(3930) in the J/ψϕ and J/ψω invariant mass spectra, can be understood well under the uniform framework of the molecular charmonium, which can be tested by future experiments.
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