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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Improved search for D0-D̄0 mixing using semileptonic decays at Belle

Bitenc U., Adachi I., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Bedny I., Belous K., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chen A., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Fratina S., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Kah D. H., Kaji H., Kapusta P., Katayama N., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Korpar S., Kozakai Y., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuroki Y., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Li J., Liu C., Liventsev D., Mandl F., Matyja A., McOnie S., Medvedeva T., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Nakao M., Nakazawa H., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H., Pakhlov P., Pakhlova G., Palka H., Park C. W., Park H., Peak L. S., Pestotnik R., Piilonen L. E.

A search for mixing in the neutral D meson system has been performed using semileptonic D0→K(*)-e+ν and D0→K(*)-μ+ν decays. Neutral D mesons from D*+→D0πs+ decays are used and the flavor at production is tagged by the charge of the slow pion. The measurement is performed using 492fb-1 of data recorded by the Belle detector. From the yield of right-sign and wrong-sign decays arising from nonmixed and mixed events, respectively, we measure the ratio of the time-integrated mixing rate to the unmixed rate to be RM=(1.3±2.2±2.0)×10-4. This corresponds to an upper limit of RM<6.1×10-4 at the 90% C.L. © 2008 The American Physical Society.