Regular Article - Theoretical Physics
J/ψ→VP decays and the quark and gluon content of the η and η ′
Grup de Física Teòrica and IFAE, Universitat Autònoma de Barcelona, 08193, Bellaterra (Barcelona), Spain
* e-mail: Rafel.Escribano@ifae.es
Published online: 17 November 2009
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 φ P =(40.7±2.3)°. In presence of gluonium, the values for the mixing angle and the gluonic content of the η ′ wave function are φ P =(44.6±4.4)° and , respectively. The newly reported values of B(J/ψ→ρ π) by the BABAR and BES Collaborations are crucial to get a consistent description of the data.
PACS: 12.39.-x – / 13.25.Gv –
© Springer-Verlag / Società Italiana di Fisica, 2010