The Belle Collaboration observed an enhancement called $X(4630)$ in the ${\Lambda }_c^{+}{\Lambda }_c^{-}$ mass distribution using initial state radiation. We demonstrate that the enhancement could be consistent with the ${\psi }^{\prime }{f}_0(980)$ molecular picture of the $Y(4660)$ taking into account the ${\Lambda }_c^{+}{\Lambda }_c^{-}$ final state interaction. To test the hypothesis that the $X(4630)$ and $Y(4660)$ are the same molecular state, we give predictions for its spin partner, the ${\eta }_c^{\prime }{f}_0(980)$ molecule. High statistic measurements of the $B$ decays into the $K{\Lambda }_c^{+}{\Lambda }_c^{-}$ and $K{\eta }_c^{\prime }{\pi }^{+}{\pi }^{-}$ are strongly recommended.

• Received 27 September 2010

DOI:https://doi.org/10.1103/PhysRevD.82.094008