A QCD sum rule calculation for the Y(4140)Y(4140) narrow structure

We use the QCD sum rules to evaluate the mass of a possible scalar mesonic state that couples to a molecular Ds∗D¯s∗ current. We find a mass mDs∗Ds∗=(4.14±0.09) GeV, which is in an excellent agreement with the recently observed Y(4140)Y(4140) charmonium state. We consider the contributions of condensates up to dimension-eight, we work at leading order in αsαs and we keep terms which are linear in the strange quark mass msms. We also consider a molecular D∗D¯∗ current and we obtain mD∗D∗=(4.13±0.10)mD∗D∗=(4.13±0.10), around 200 MeV above the mass of the Y(3930)Y(3930) charmonium state. We conclude that it is possible to describe the Y(4140)Y(4140) structure as a Ds∗D¯s∗ molecular state or even as a mixture of Ds∗D¯s∗ and D∗D¯∗ molecular states.