DD,   DD*,   D*D*,   DsDs,   DsDs*,   Ds*Ds*
coupled P-wave scattering resonances

Charmonium
shifts wrt confinement spectrum
state
1S
2S
1D
3S
2D
4S
shift MeV
358
171
19
150
45
117


about 500 MeV, T. Barnes, hep-ph/0412057
unimportant, M. Pennington, hep-ph/0504262
about 200 MeV, Yu.S. Kalashnikova, hep-ph/0506270