The ρ-π Puzzle of J/ψ and ψ′ Decays
S. F. Tuan · Communications in Theoretical Physics · 2000
The recent BES Collaboration data on , particularly the isospin violating mode and finding of a finite number for , enable us now to deal more precisely about the challenges to theory concerning this extraordinary and remarkable so-called puzzle of and decays. In terms of the existing data and deploying the simplest phenomenology, measurement of and whether a finite number for the mode might require a significantly large accumulation of data remain interesting questions.