J. Li, Z. P. Zhang, A. J. Schwartz, for the Belle Collaboration
Published 2004-08-24, updated 2004-11-08Version 2
We have searched for mixing in the D0-D0bar system by measuring the decay-time distribution of D0->K+pi- decays. The analysis uses 90 fb^{-1} of data collected by the Belle detector at the KEKB e+e- collider. We fit the decay-time distribution for the mixing parameters x' and y' and also for the parameter R_D, which is the ratio of the rate for the doubly-Cabibbo-suppressed decay D0->K+pi- to that for the Cabibbo-favored decay D0->K-pi+. We do these fits both assuming CP conservation and allowing for CP violation. We use a frequentist method to obtain a 95% C.L. region in the x'^2 - y' plane. Assuming no mixing, we measure R_D = (0.381 \pm 0.017 +0.008 -0.016) %.
Comments: 9 pages, 3 figures, 1 table, originally submitted to ICHEP2004 (Beijing, China); final version submitted to Physical Review Letters
Journal: Phys.Rev.Lett.94:071801,2005
Improved Constraints on D0-D0bar Mixing in D0 -> K+ pi- Decays from the Belle Detector
Charge Asymmetry of Same-Sign Dileptons in $B^0$-$\bar{B}^0$ Mixing
Measurement of charmless $B$ Decays to $ηK^*$ and $ηρ$
