Searches for isospin-violating transitions χc0,2→π0ηc

Le résumé fourni par la source

We present the first upper-limit measurement of the branching fractions of the isospin-violating transitions ${\ensuremath{\chi}}_{c0,2}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}_{c}$. The measurements are performed using $106\ifmmode\times\else\texttimes\fi{}1{0}^{6}$ $\ensuremath{\psi}(3686)$ events accumulated with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider at a center-of-mass energy corresponding to the $\ensuremath{\psi}(3686)$ mass. We obtained upper limits on the branching fractions at a 90% confidence level of $B({\ensuremath{\chi}}_{c0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}_{c})<1.6\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}$ and $B({\ensuremath{\chi}}_{c2}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\eta}}_{c})<3.2\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}$.

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