Abstract
If the true values of the D 0 – D 0 mixing parameters lie within the one sigma ranges of recent measurements, then there is strong evidence for a large width difference, y≳0.01, and large SU(3) breaking effects in strong phases, δ≳ π/4. These constraints are model independent, and would become stronger if | M 12/ Γ 12|≪1 in the D 0 – D 0 system. The interesting fact that the FOCUS result cannot be explained by a large mass difference is not trivial and depends on the small D 0/ D 0 production asymmetry in FOCUS and the bounds on CP violating effects from CLEO. The large value of δ might help explain why y∼sin 2 θ c .
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