Measurement of Charmed Meson Lifetimes with Belle
نویسنده
چکیده
The lifetimes of charmed mesons have been measured using 2.75 fb of data collected with the Belle detector at KEKB. Each candidate is fully reconstructed to identify the flavor of the charmed meson. The lifetimes are measured to be τ(D) = (414.8±3.8±3.4) fs, τ(D) = (1040 −22 ± 18) fs and τ(D + s ) = (479 +17 −16 +6 −8) fs, where the first error is statistical and the second error is systematic. The ratios of the lifetimes of D and D s with respect to D 0 are measured to be τ(D)/τ(D) = 2.51 ± 0.06 ± 0.04 and τ(D s )/τ(D ) = 1.15± 0.04 −0.02 . The mixing parameter yCP is also measured through the lifetime difference of D mesons decaying into CP-mixed states and CP eigenstates. We find yCP = (1.0 +3.8 −3.5 +1.1 −2.1 ) %, corresponding to a 95% confidence interval −7.0% <
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Measurements of Charmed Meson Lifetimes and Search for D 0-d 0 Mixing with the Belle Experiment
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