Improved Constraints on D0D¯0 Mixing in D0K+π Decays from the Belle Detector

L. M. Zhang et al. (Belle Collaboration)
Phys. Rev. Lett. 96, 151801 – Published 17 April 2006

Abstract

We report the results of a search for D0D¯0 mixing in D0K+π decays based on 400fb1 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 RD, the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays. The 95% confidence level region in the (x2,y) plane is obtained using a frequentist method. Assuming CP conservation, we find x2<0.72×103 and 9.9×103<y<6.8×103 at the 95% confidence level; these are the most stringent constraints on the mixing parameters to date. The no-mixing point (0,0) has a confidence level of 3.9%. Assuming no mixing, we measure RD=(0.377±0.008±0.005)%.

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  • Received 17 January 2006

DOI:https://doi.org/10.1103/PhysRevLett.96.151801

©2006 American Physical Society

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Vol. 96, Iss. 15 — 21 April 2006

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