Measurement of the branching fraction for ψ(3686)→ωK+K−

Le résumé fourni par la source

With $1.06\ifmmode\times\else\texttimes\fi{}{10}^{8}$ $\ensuremath{\psi}(3686)$ events collected with the BESIII detector, the branching fraction of $\ensuremath{\psi}(3686)\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{+}{K}^{\ensuremath{-}}$ is measured to be $(1.54\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.11)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}4}$. This is the most precise result to date, due to the largest $\ensuremath{\psi}(3686)$ sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\omega}{K}^{+}{K}^{\ensuremath{-}}$, the ratio $\mathcal{B}(\ensuremath{\psi}(3868)\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}})/\mathcal{B}(J/\ensuremath{\psi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}})$ is determined to be $(18.4\ifmmode\pm\else\textpm\fi{}3.7)%$. This constitutes a significantly improved test of the 12% rule, with the uncertainty now dominated by the $J/\ensuremath{\psi}$ branching fraction.

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