Analysis of the Y(4220) and Y(4390) as molecular states with QCD sum rules

In this article, we assign the Y(4390) and Y(4220) to be the vector molecular states D 1 (2420) and , respectively, and study their masses and pole residues in detail with the QCD sum rules. The present calculations only favor assigning the Y(4390) to be the D 1 (1 − − ) molecular state.