P-wave [cs][(c)over-bar (s)over-bar] tetraquark state: Y(4260) or Y(4660)?

The mass of a P-wave cs-scalar-diquark (c) over bar (s) over bar -scalar-antidiquark state is computed in the framework of QCD sum rules. The result 4.69 +/- 0.36 GeV is in good agreement with the experimental value of Y(4660) but higher than Y(4260)'s, which supports the P-wave [cs][(c) over bar (s) over bar] configuration for Y(4660) while disfavors the interpretation of Y(4260) as the P-wave [cs][(c) over bar (s) over bar] state. In the same picture, the mass of P-wave [bs][(b) over bar (s) over bar] is predicted to be 11.19 +/- 0.49 GeV.