Jψ→vector+pseudoscalardecays and the quark content ofηandη′
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Abstract
Branching ratios of $\frac{J}{\ensuremath{\psi}}$ decays into $\ensuremath{\omega}{\ensuremath{\pi}}^{0}$, $\ensuremath{\omega}\ensuremath{\eta}$, $\ensuremath{\omega}{\ensuremath{\eta}}^{\ensuremath{'}}$, $\ensuremath{\rho}\ensuremath{\eta}$, $\ensuremath{\rho}{\ensuremath{\eta}}^{\ensuremath{'}}$, $\ensuremath{\varphi}\ensuremath{\eta}$, $\ensuremath{\varphi}{\ensuremath{\eta}}^{\ensuremath{'}}$, and ${K}^{*}(892)\overline{K}+\mathrm{charge}$ conjugate are measured from the 8.6 \ifmmode\times\else\texttimes\fi{} ${10}^{6}$ $\frac{J}{\ensuremath{\psi}'\mathrm{s}}$ produced by the DM2 experiment at the Orsay ${e}^{+}{e}^{\ensuremath{-}}$ storage ring DCI. The $\ensuremath{\eta}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}$ mesons are found consistent with a $q\overline{q}$ structure and a mixing angle ${\ensuremath{\theta}}_{P}=(\ensuremath{-}19.1\ifmmode\pm\else\textpm\fi{}1.4)\ifmmode^\circ\else\textdegree\fi{}$.
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