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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2010, vol. 82, p. -

Observation of B+→D̄*0τ+ντ and evidence for B+→D̄0τ+ντ at Belle

Bozek A., Rozanska M., Adachi I., Aihara H., Arinstein K., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Bhardwaj V., Bischofberger M., Bondar A., Bračko M., Browder T. E., Chao Y., Chen A., Cheon B. G., Cho I. S., Choi K. S., Choi Y., Dalseno J., Doležal Z., Drásal Z., Drutskoy A., Dungel W., Eidelman S., Goldenzweig P., Golob B., Ha H., Hara K., Hasegawa Y., Hayashii H., Higuchi T., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Iwabuchi M., Iwasaki Y., Joshi N. J., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kiesling C., Kim H. O., Kim J. H., Kim M. J., Kim S. K., Kim Y. J., Ko B. R., Korpar S., Krišan P., Krokovny P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lee M. J., Lee S. H., Li J., Liventsev D., Louvot R., Matyja A., McOnie S., Miyata H., Miyazaki Y., Mizuk R., Mohanty G. B., Nakano E., Nakao M., Nakazawa H., Neubauer S., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ostrowicz W., Pakhlov P., Pakhlova G., Park C. W.

We present measurements of B+→D̄ *0τ+ντ and B+→D̄0τ+ντ decays in a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 446-56+58 B+→D̄*0τ+ντ events with a significance of 8.1 standard deviations, and 146-41+42 B+→D̄0τ+ν τ events with a significance of 3.5 standard deviations. The latter signal provides the first evidence for this decay mode. The measured branching fractions are B(B+→D̄*0τ+ντ)=(2. 12-0.27+0.28(stat)±0.29(syst))% and B(B+→D̄0τ+ν τ)=(0.77±0.22(stat)±0.12(syst))%. © 2010 The American Physical Society.