(Q(s)over-bar)(*)((Q)over-bars)(*) molecular states from QCD sum rules: a view on Y(4140)

Masses for the (Q (s) over bar)(*)((Q) over bars)(*) (Q = c or b) molecular states are systematically computed in the framework of QCD sum rules. Technically, contributions of the operators up to dimension 6 are included in operator product expansion (OPE). The numerical result 4.13 +/- 0.10 GeV for D-s*(D) over bar (s)* agrees well with the mass 4143.0 +/- 2.9 +/- 1.2 MeV for Y(4 1 4 0), which supports the D-s*(D) over bar (s)* molecular configuration for Y(4140).