A measurement of lifetime differences in the neutral D-meson system
Daniele Pedrini2000, Physics Letters B
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Abstract
Using a high statistics sample of photoproduced charm particles from the FOCUS experiment at Fermilab, we compare the lifetimes of neutral D mesons decaying via D 0 → K -π + and K -K + to measure the lifetime differences between CP even and CP odd final states. These measurements bear on the phenomenology of D 0 -D0 mixing. If the D 0 → K -π + is an equal mixture of CP even and CP odd eigenstates, we measure y CP = (Γ(CP even) -Γ(CP odd))/(Γ(CP even) + Γ(CP odd)) = 0.0342 ± 0.0139 ± 0.0074.
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