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

Abstract

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

6 pages, uses aipproc style. Talk presented at SCADRON 70: Workshop on "Scalar Mesons and Related Topics", Lisbon, Portugal, 11-16 February 2008