J/psi->VP decays and the quark and gluon content of the eta and eta'

Details J/psi->VP decays and the quark and gluon content of the eta and eta' J/psi->VP decays and the quark and gluon content of the eta and eta'

2008-07-25

arxiv.org/abs/0807.4201v2

Eur.Phys.J.C65:467-473,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 1 figure, uses svjour style. Comments on the relationship between J/psi to VP and V to Pgamma decays and on the negle

Scientific paper

10.1140/epjc/s10052-009-1206-9

The $\eta$-$\eta^\prime$ pseudoscalar mixing angle and the gluonium content of the $\eta^\prime$ meson are deduced from an updated phenomenological analysis of $J/\psi$ decays into a vector and a pseudoscalar meson. In absence of gluonium, the value of the mixing angle in the quark-flavour basis is found to be $\phi_P=(40.7\pm 2.3)^\circ$. In presence of gluonium, the values for the mixing angle and the gluonic content of the $\eta^\prime$ wave function are $\phi_P=(44.6\pm 4.4)^\circ$ and $Z^2_{\eta^\prime}=0.29^{+0.18}_{-0.26}$, respectively. The newly reported values of $B(J/\psi\to\rho\pi)$ by the BABAR and BES Collaborations are crucial to get a consistent description of data.

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