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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2007, vol. 98, p. -

Evidence for D0-D̄0 mixing

Starič M., Golob B., Abe K., Abe K., Adachi I., Aihara H., Arinstein K., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi S. K., Choi Y., Cole S., Dalseno J., Danilov M., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Garmash A., Goriek A., Ha H., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Higuchi T., Hokuue T., Hoshi Y., Hou W. S., Iijima T., Ikado K., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kaji H., Kapusta P., Katayama N., Kawasaki T., Kibayashi A., Kichimi H., Kim S. K., Kim Y. J., Kinoshita K., Korpar S., Krian P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., Mandl F., Marlow D., Matsumoto T., Matyja A., McOnie S.

We observe evidence for D0-D̄0 mixing by measuring the difference in the apparent lifetime when a D0 meson decays to the CP eigenstates K+K- and π+π- and when it decays to the final state K-π+. We find the relative difference of the lifetimes yCP to be [1.31±0.32(stat)±0.25(syst)] %, 3.2 standard deviations from zero. We also search for a CP asymmetry between D0 and D̄0 decays; no evidence for CP violation is found. These results are based on 540fb-1 of data recorded by the Belle detector at the KEKB e+e- collider. © 2007 The American Physical Society.