QCD sum rule calculation for the charmonium-like structures in the J/Ψφ and J/Ψφ invariant mass spectra

摘要

Using the QCD sum rules we test if the charmonium-like structure Y(4274), observed in the J/Ψ invariant mass spectrum, can be described with a D_sD?_(s0)(2317)+h.c. molecular current with JPC=0Ψ+. We consider the contributions of condensates up to dimension ten and we work at leading order in α s. We keep terms which are linear in the strange quark mass ms. The mass obtained for such state is m_(DsDs0)=(4.78±0.54) GeV. We also consider a molecular 0-~+_(DD0)(2400)+h.c. current and we obtain mDD0=(4.55±0.49)GeV. Our study shows that the newly observed Y(4274) in the J/Ψ invariant mass spectrum can be, considering the uncertainties, described using a molecular charmonium current.