Search for the Flavor-Changing Neutral Current Decay $D^0\to {\mu }^{+}{\mu }^{-}$ with the HERA-B Detector

B Collaboration, I. Abt

We report on a search for the flavor-changing neutral current decay $D^0\to {\mu }^{+}{\mu }^{-}$ using $50\times 10^6$ events recorded with a dimuon trigger in interactions of 920 GeV protons…