Measurement of the Lifetime Difference in $D^{0}$ Meson Decays

We report a measurement of the

D^{0} - {\bar{D}}^{0}

mixing parameter

y_{CP}

using

23.4 {fb}^{- 1}

of data collected near the

ϒ (4 S)

resonance with the Belle detector at KEKB.

y_{CP}

is measured from the lifetime difference of

D^{0}

mesons decaying into the

K^{-} π^{+}

state and the

CP

-even eigenstate

K^{-} K^{+}

. We find

y_{CP} = (- 0.5 \pm {1.0}_{- 0.8}^{+ 0.7}) \times 10^{- 2}

, where the first error is statistical and the second is systematic, corresponding to a

95 %

confidence interval

- 0.030 < y_{CP} < 0.020

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Measurement of the Lifetime Difference inD0Meson Decays