Abstract
We have searched for the decay D 0 → μ + μ − among 2.0 × 10 5 μ + μ − pair produced, in the WA92 experiment, by 350 GeV/ c π − particles interacting in copper and tungsten targets. Using a high-resolution silicon-microstrip detector followed by a large-acceptance magnetic spectrometer and a muon filter we are able to measure the momentum of the muons, to visualize the event topology near their point of origin, and thus to discriminate between prompt and non-prompt muons. No D 0 → μ + μ − candidate has been found. This result allows us to set an upper limit on the branching fraction B( D 0 → μ + μ − ) of 4.1 × 10 −6 at 90 % confidence level.
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