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We have searched for the decay D 0 → μ + μ - among 2.0 10 5 μ + μ - pairs 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...
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