A search for the decay D$^0 \rightarrow \mu^+\mu^-$
1985
Abstract μ + μ − pairs have been observed in deep inelastic muon-nucleon scattering and their masses measured with high resolution. No significant signal was observed at the D 0 mass. These data allow an upper limit of 3.4 × 10 −4 (90% confidence level) to be placed on the branching ratio for the decay mode D 0 → μ + μ − .
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