The η-η′ mixing angle is deduced from an updated phenomenological analysis of J/ψ; decays into a vector and a pseudoscalar meson. Its value in the quarka-flavour basis is found to be φP = (40.5±2.4), in agreement with most recent analyses. Corrections due to nona-ideal ω-φ mixing are shown to be negligible. The newly reported values of B(J/ψ;→ρπ) by the BABAR and BES Collaborations are crucial to get a consistent description of data. © 2008 American Institute of Physics.
- →VP decays