Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-03
Acta Phys.Polon.Supp.2:71-78,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, uses appolb style. Talk presented at the Symposium on Meson Physics, Cracow, Poland, 1-4 October 2008
Scientific paper
The $\eta$-$\eta^\prime$ pseudoscalar mixing angle and the gluonium content of the $\eta^\prime$ meson are deduced from an updated phenomenological analysis of $V\to P\gamma$ and $J/\psi\to VP$ decays. In absence of gluonium, the value of the mixing angle in the quark-flavour basis is found to be $\phi_P=(41.5\pm 1.2)^\circ$ from $V\to P\gamma$ and $\phi_P=(40.5\pm 2.4)^\circ$ from $J/\psi\to VP$. In presence of gluonium, the values for the mixing angle and the gluonic content of the $\eta^\prime$ wave function are $\phi_P=(41.4\pm 1.3)^\circ$ and $Z^2_{\eta^\prime}=0.04\pm 0.09$ from $V\to P\gamma$ and $\phi_P=(44.5\pm 4.3)^\circ$ and $Z^2_{\eta^\prime}=0.28\pm 0.21$ from $J/\psi\to VP$, respectively.
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