PSI(2S) Two- and Three-Body Hadronic Decays

The authors report measurements of branching fractions for ψ(2S) decays into ωπ+ π-, b1π, ωf2(1270), ωK+K-, ωp(bar p), φπ+π-, φf0(980), φK+ K-, and an upper limit for φp(bar p) final states based on a data sample of (4.02 ± 0.22) x 106 ψ(2S) events collected with the BESI detector at the Beijing Electron-Positron Collider. The branching fractions for b1π and ωf2(1270) update previous BES results, while those for other decay modes are first measurements. The ratios of ψ(2S) and J/ψ branching fractions are smaller than what is expected from the 12% rule by a factor of six for ωf2(1270), by a factor of two for ωπ+ π-, ωp(bar p), and φK+ K-, while for other studied channels the ratios are consistent with expectation within errors