Peaks observed by Belle in DD at 3.878 GeV and in D*D* at 4.156 GeV may be fitted by phase space multiplied by a form factor with an RMS radius of interaction 0.63 fm. The peak observed in Lambda_C Lambda_C at 4.63 GeV may be explained by Y(4660), multiplied by a corresponding form factor with RMS radius 0.94 fm.
Cite
@article{arxiv.0811.2559,
title = {An alternative fit to Belle mass spectra for DD, D*D* and Lambda_C Lambda_c},
author = {D. V. Bugg},
journal= {arXiv preprint arXiv:0811.2559},
year = {2009}
}