J/ψ→VP decays and the quark and gluon content of the η and η′

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The η-η′ pseudoscalar mixing angle and the gluonium content of the η′ meson are deduced from an updated phenomenological analysis of J/ψ decays into a vector and a pseudoscalar meson. In absence of gluonium, the value of the mixing angle in the quark-flavor basis is found to be φP=(40.7±2.3)°. In presence of gluonium, the values for the mixing angle and the gluonic content of the η′ wave function are φP=(44.6±4.4)° and Z2 = 0.29-0.26+0.18 respectively. The newly reported values of B(J/ψ→ρπ) by the BABAR and BES Collaborations are crucial to get a consistent description of the data. © Springer-Verlag / Società Italiana di Fisica 2009.
Original languageEnglish
Pages (from-to)467-473
JournalEuropean Physical Journal C
Issue number3
Publication statusPublished - 1 Jan 2010


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