Observation of the Decay ψ(2S)→KS0KL0

Le résumé fourni par la source

The decay $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{L}^{0}$ is observed using $\ensuremath{\psi}(2S)$ data collected with the Beijing Spectrometer at the Beijing Electron-Positron Collider; the branching fraction is determined to be $\mathcal{B}\mathbf{(}\ensuremath{\psi}(2S)\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{L}^{0}\mathbf{)}=(5.24\ifmmode\pm\else\textpm\fi{}0.47\ifmmode\pm\else\textpm\fi{}0.48)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$. Compared with $J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{L}^{0}$, the $\ensuremath{\psi}(2S)$ branching fraction is enhanced relative to the prediction of the perturbative QCD ``12%'' rule. The result, together with the branching fractions of $\ensuremath{\psi}(2S)$ decays to other pseudoscalar meson pairs (${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}^{+}{K}^{\ensuremath{-}}$), is used to investigate the relative phase between the three-gluon and the one-photon annihilation amplitudes of $\ensuremath{\psi}(2S)$ decays.

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