Update of eta-eta' mixing from J/psi->VP decays

Abstract

The $\eta$-$\eta^\prime$ mixing angle is deduced from an updated phenomenological analysis of $J/\psi$ decays into a vector and a pseudoscalar meson. Corrections due to non-ideal $\omega$-$\phi$ mixing are confirmed to be crucial to find $\theta_P=(-16.9\pm 1.7)^\circ$, in agreement with most recent analyses. The newly reported values of $B(J/\psi\to\rho\pi)$ by the BABAR and BES Collaborations make more difficult a reasonable description of data.