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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2005, vol. 94, p. -

Search for D 0-D̄ 0 Mixing in D 0 → K + π - decays and measurement of the doubly-cabibbo-suppressed decay rate

Li J., Zhang Z. P., Schwartz A. J., Abe K., Abe K., Aihara H., Akatsu M., Asano Y., Aushev T., Bakich A. M., Bay A., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Fang F., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Haba J., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hokuue T., Hoshi H., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kim J. H., Kim S. K., Kinoshita K., Krokovny P., Kulasiri R., Kuo C. C., Kwon Y. J., Lange L. S., Leder G., Lee S. H., Lesiak T., Limosani A., Lin S. W., Liventsev D., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyata H., Mizuk R., Mohapatra D., Mori T., Nagamine T., Nagasaka Y., Nakadaira T., Nakano E., Nishida S., Nitoh O., Ogawa S., Ohshima T., Olsen S. L., Stanič S.

We have searched for mixing in the D 0-D̄ 0 system by measuring the decay-time distribution of D 0 → K + π - 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 D 0→ K + π - to that for the Cabibbb-favored decay D 0 → K - π +. 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 ± 0.017 -0.016 +0.008)%. © 2005 The American Physical Society.