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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2013, vol. 110, p. -

Evidence for B-→τ-ν̄τ with a hadronic tagging method using the full data sample of belle

Hara K., Horii Y., Iijima T., Adachi I., Aihara H., Asner D. M., Aushev T., Aziz T., Bakich A. M., Barrett M., Bhardwaj V., Bhuyan B., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Chekelian V., Chen A., Chen P., Cheon B. G., Chilikin K., Cho I. S., Cho K., Choi Y., Cinabro D., Dalseno J., Dingfelder J., Doležal Z., Drásal Z., Drutskoy A., Dutta D., Eidelman S., Epifanov D., Esen S., Farhat H., Frey A., Gaur V., Gabyshev N., Ganguly S., Gillard R., Goh Y. M., Golob B., Haba J., Hara T., Hayasaka K., Hayashii H., Higuchi T., Hoshi Y., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Iwashita T., Julius T., Kang J. H., Kawasaki T., Kiesling C., Kim H. O., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., Kouzes R. T., Križan P., Krokovny P., Kronenbitter B., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Li J., Li Y., Libby J., Liu C., Liu Y., Liu Z. Q., Liventsev D., Matvienko D., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Moll A.

We measure the branching fraction of B-→τ -ν̄τ using the full Υ(4S) data sample containing 772×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. Events with BB̄ pairs are tagged by reconstructing one of the B mesons decaying into hadronic final states, and B-→τ -ν̄τ candidates are detected in the recoil. We find evidence for B-→τ -ν̄τ with a significance of 3.0 standard deviations including systematic errors and measure a branching fraction B(B -→τ-ν̄τ)=[0.72-0.25+0. 27(stat)±0.11(syst)]×10-4. © 2013 American Physical Society.