FOCUS is well configured for this measurement

• A very high statistics charm sample
  • Over 1 million fully reconstructed charm decays

• Extremely good proper time resolution : ?? ? 8% ?(D0)
  • No resolution convolution systematics or error inflation

• A segmented target with ~62% of decays verticizing in air
  • Significantly minimizes absorption corrections in matter

• Excellent (and flexible) Cerenkov identification
  • Vary misidentification reflections to gauge systematics.

• Skims use a vertexing algorithm with nearly flat t’ acceptance
  • Minimizes any reliance on MC and reduces systematic error

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