ΛcΛc
     
     
ΛcΛc and charm-anticharm
are the creation of
2 quark-antiquark pairs
away from each other.
D*D* and charm-anticharm
are the creation of
only 1 quark-antiquark pair
away from each other.

  Left:   &psi (5S) and &psi (4D) couple weakly to ΛcΛc.

  Right:   ΛcΛc couples weakly to cc

  arXiv:1004.4368