Observation of the decay χcJ→Ω−Ω¯+

Résumé fourni par la source

Using an ${e}^{+}{e}^{\ensuremath{-}}$ collision data sample of $(27.08\ifmmode\pm\else\textpm\fi{}0.14)\ifmmode\times\else\texttimes\fi{}{10}^{8}\text{ }\text{ }\ensuremath{\psi}(3686)$ events collected by the BESIII detector, we report the first observation of ${\ensuremath{\chi}}_{cJ}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\overline{\mathrm{\ensuremath{\Omega}}}}^{+}$ ($J=0$, 1, 2) decays with significances of $5.6\ensuremath{\sigma}$, $6.4\ensuremath{\sigma}$, and $18\ensuremath{\sigma}$, respectively, where the ${\ensuremath{\chi}}_{cJ}$ mesons are produced in the radiative $\ensuremath{\psi}(3686)$ decays. The branching fractions are determined to be $\mathcal{B}({\ensuremath{\chi}}_{c0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\overline{\mathrm{\ensuremath{\Omega}}}}^{+})=(3.51\ifmmode\pm\else\textpm\fi{}0.54\ifmmode\pm\else\textpm\fi{}0.29)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, $\mathcal{B}({\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\overline{\mathrm{\ensuremath{\Omega}}}}^{+})=\phantom{\rule{0ex}{0ex}}(1.49\ifmmode\pm\else\textpm\fi{}0.23\ifmmode\pm\else\textpm\fi{}0.10)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, and $\mathcal{B}({\ensuremath{\chi}}_{c2}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}^{\ensuremath{-}}{\overline{\mathrm{\ensuremath{\Omega}}}}^{+})=(4.52\ifmmode\pm\else\textpm\fi{}0.24\ifmmode\pm\else\textpm\fi{}0.18)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where the first and second uncertainties are statistical and systematic, respectively.

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