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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 96, p. -

Improved constraints on D0-D̄0 mixing in D0→K+π- Decays from the Belle detector

Zhang L. M., Zhang Z. P., Li J., Abe K., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Barbero M., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Gabyshev N., Gershon T., Go A., Gokhroo G., Golob B., Gorišek A., Ha H. C., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim S. K., Kim S. M., Kinoshita K., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lee J., Lesiak T., Lin S. W., Liventsev D., Mandl F., Matsumoto T., Mikami Y., Mitaroff W.

We report the results of a search for D0-D̄0 mixing in D0→K+π- decays based on 400fb-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 RD, 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<0.72×10-3 and -9.9×10-3<y′<6.8×10-3 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)%. © 2006 The American Physical Society.