Measurements of Lifetimes and a Limit on the Lifetime Difference in the NeutralD-Meson System
Abstract
Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report the first directly measured constraint on the decay-width difference ΔΓ for the mass eigenstates of the D0- D¯0 system. We obtain our result from lifetime measurements of the decays D0→K−π+ and D0→K−K+, under the assumption of CP invariance, which implies that the CP eigenstates and the mass eigenstates are the same. The lifetime of D0→K−K+ (the CP-even final state) is τKK=0.410±0.011±0.006ps, and the lifetime of D0→K−π+ (an equal mixture of CP-odd and CP-even final states) is τKπ=0.413±0.003±0.004ps. The decay-width difference is ΔΓ=2(ΓKK−ΓKπ)=0.04±0.14±0.05ps−1. We relate these measurements to measurements of mixing in the neutral D-meson system.
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271817
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271817
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10.1103/physrevlett.83.32
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