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

The HERA-B collaboration Abt, I. ; Adams, M. ; Albrecht, H. ; et al.
Phys.Lett.B 596 (2004) 173-183, 2004.
Inspire Record 650658 DOI 10.17182/hepdata.57496

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 with nuclei by the HERA-B experiment. We find no evidence for such decays and set a 90% confidence level upper limit on the branching fraction $Br(D^0 \to \mu^+\mu^-) <2.0 \times 10^{-6}$.

1 data table
Table 1

Upper limit on the branching fraction of D0 --> MU+ MU- in P NUCLEON interaction.