Search for the rare decay D0→γγ at Belle

Le résumé fourni par la source

We search for the rare radiative decay ${D}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ using a data sample with an integrated luminosity of $832\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ recorded by the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ asymmetric-energy collider. We find no statistically significant signal and set an upper limit on the branching fraction of $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma})<8.5\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}7}$ at 90% confidence level. This is the most restrictive limit on the decay channel to date.

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