Question: A charmed meson D 0 decays D 0 K - + at a distance from the production point d=3 mm long. Measuring the total

A ‘charmed’ meson D⁰ decays D⁰→K^-π+ at a distance from the production point d=3 mm long. Measuring the total energy of the decay products one finds E=30 GeV. How long did the D live in proper time? How large is the π⁺ momentum in the D rest-frame?

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