Improved Constraints on D0-D0bar Mixing in D0 -> K+ pi- Decays from the Belle Detector

Details Improved Constraints on D0-D0bar Mixing in D0 -> K+ pi- Decays from the Belle Detector Improved Constraints on D0-D0bar Mixing in D0 -> K+ pi- Decays from the Belle Detector

2006-01-17

arxiv.org/abs/hep-ex/0601029v2

Phys.Rev.Lett.96:151801,2006

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, 1 table; replaced with the version of Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.96.151801

We report the results of a search for D0-D0bar mixing in D0 -> K+ pi- decays based on 400 fb^{-1} of data accumulated by the Belle detector at KEKB. Both assuming CP conservation and allowing for CP violation, we fit the decay-time distribution for the mixing parameters x' and y', as well as for the parameter R_D, the ratio of doubly-Cabibbo-suppressed decays to Cabibbo-favored decays. The 95% confidence level region in the (x'^2,y') plane is obtained using a frequentist method. Assuming CP conservation, we find x'^2<0.72 x 10^{-3} and -9.9 x 10^{-3}

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