A Measurement of Lifetime Difference in $D^0$ Meson Decays

Details A Measurement of Lifetime Difference in $D^0$ Meson Decays A Measurement of Lifetime Difference in $D^0$ Meson Decays

2001-11-08

arxiv.org/abs/hep-ex/0111026v3

Phys.Rev.Lett.88:162001,2002

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.88.162001

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 $\Upsilon$(4S) resonance with the Belle detector at KEKB. $y_{CP}$ is measured from the lifetime difference of $D^0$ mesons decaying into the $K^-\pi^+$ state and the CP even eigenstate $K^-K^+$. We find $y_{CP}=(-0.5\pm 1.0{}^{+0.7}_{-0.8})\times10^{-2}$, where the first error is statistical and the second systematic, corresponding to a 95% confidence interval $-0.030 < y_{CP} < 0.020$.

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