Search for η c ′ decays into vector meson pairs

Le résumé fourni par la source

The processes ${\ensuremath{\eta}}_{c}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\rho}}^{0}$, ${K}^{*0}{\overline{K}}^{*0}$, and $\ensuremath{\phi}\ensuremath{\phi}$ are searched for using a sample of $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ ${\ensuremath{\psi}}^{\ensuremath{'}}$ events collected with the BESIII detector at the BEPCII collider. No signals are observed in any of the three final states. The upper limits on the decay branching fractions are determined to be $\mathcal{B}({\ensuremath{\eta}}_{c}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{0}{\ensuremath{\rho}}^{0})<3.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, $\mathcal{B}({\ensuremath{\eta}}_{c}^{\ensuremath{'}}\ensuremath{\rightarrow}{K}^{*0}{\overline{K}}^{*0})<5.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$, and $\mathcal{B}({\ensuremath{\eta}}_{c}^{\ensuremath{'}}\ensuremath{\rightarrow}\ensuremath{\phi}\ensuremath{\phi})<2.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ at the 90% confidence level. The upper limits are lower than the existing theoretical predictions.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.