Various theoretical models for paracharmonium are critically reviewed. The main emphasis is put on the dispersion approach which has proved to be powerful enough to fix, say, the ηc mass, mηc=(3.00±0.02) GeV. A few original remarks concerning mainly the radiative transitions in charmonium are included. In particular, a new, simple, and reliable method for calculating Γ(J/ψ→ηcγ) is described which makes no reference to potentials, overlap integrals, etc.
|Original language||English (US)|
|Number of pages||9|
|Journal||Zeitschrift für Physik C Particles and Fields|
|State||Published - Dec 1980|