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

Belle Collaboration, K. Abe

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 ${\rm Y}$(4S) resonance with the Belle detector at KEKB. $y_{…