We discuss the decays ψ';'→J/ψ+π0 and ψ';'→J/ψ+η. We obtain a reliable, model-independent theoretical prediction for the ratio of the decay rates based only on the QCD lagrangian and certain low-energy theorems. The theoretical formula, apart from kinematical factors, contains only the ratio of the current quark masses, md/mu. Under a standard choice of md/mu theory and experiment are in good agreement with each other.
|Original language||English (US)|
|Number of pages||4|
|Journal||"Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics"|
|State||Published - Jan 1 1980|