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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2014, vol. 112, p. -

Observation of D0 - D̄ 0 Mixing in e+ e- collisions

Ko B. R., Won E., Adachi I., Aihara H., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Bala A., Bhardwaj V., Bhuyan B., Bobrov A., Bondar A., Bozek A., Bračko M., Browder T. E., Červenkov D., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho I. S., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Danilov M., Doležal Z., Drásal Z., Dutta D., Dutta K., Eidelman S., Epifanov D., Farhat H., Fast J. E., Ferber T., Gaur V., Ganguly S., Garmash A., Gillard R., Glattauer R., Goh Y. M., Golob B., Haba J., Hara T., Hayashii H., He X. H., Higuchi T., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Iwashita T., Jaegle I., Julius T., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim M. J., Kim Y. J., Klucar J., Kodyš P., Korpar S., Križan P., Krokovny P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Li J., Li Y., Libby J., Liu C., Liu Z. Q., Lukin P., Matvienko D., Miyabayashi K., Miyata H., Mohanty G. B., Moll A., Mussa R., Nagasaka Y., Nakano E.

We observe D0-D̄ 0 mixing in the decay D0→K+π - using a data sample of integrated luminosity 976 fb-1 collected with the Belle detector at the KEKB e +e- asymmetric-energy collider. We measure the mixing parameters x′ 2=(0.09±0.22)×10-3 and y′=(4.6±3.4)×10-3 and the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates RD=(3.53±0.13)×10-3, where the uncertainties are statistical and systematic combined. Our measurement excludes the no-mixing hypothesis at the 5.1 standard deviation level. © 2014 American Physical Society.