Observation of a Near-Threshold Enhancement in the ωϕ Mass Spectrum from the Doubly OZI-Suppressed Decay J/ψ→γωϕ

Le résumé fourni par la source

An enhancement near threshold is observed in the $\ensuremath{\omega}\ensuremath{\phi}$ invariant mass spectrum from the doubly Okubo-Zweig-Iizuka--suppressed decays of $J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\omega}\ensuremath{\phi}$, based on a sample of $5.8\ifmmode\times\else\texttimes\fi{}{10}^{7}$ $J/\ensuremath{\psi}$ events collected with the BESII detector. A partial wave analysis shows that this enhancement favors ${J}^{P}={0}^{+}$, and its mass and width are $M={1812}_{\ensuremath{-}26}^{+19}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}18(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$ and $\ensuremath{\Gamma}=105\ifmmode\pm\else\textpm\fi{}20(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}28(\mathrm{syst})\text{ }\text{ }\mathrm{MeV}/{c}^{2}$. The product branching fraction is determined to be $B(J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}X)B(X\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\phi})=[2.61\ifmmode\pm\else\textpm\fi{}0.27(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.65(\mathrm{syst})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$.

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