Search for flavor-changing neutral currents and lepton-family-number violation in two-body D0 decays

Le résumé fourni par la source

We present the results of a search for the three neutral charm decays ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}},$ ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}},$ and ${D}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}.$ This study was based on data collected in Experiment 789 at the Fermi National Accelerator Laboratory using $800\mathrm{GeV}/c$ proton-Au and proton-Be interactions. No evidence is found for any of the decays. Upper limits on the branching ratios, at the 90% confidence level, of $1.56\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ for ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}},$ $8.19\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$ for ${D}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ and $1.72\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ for ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}$ are obtained.

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