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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 92, 7, p. -

Measurement of the branching ratio of B ¯ →d (∗)τ- ν ¯ τ relative to B ¯ →d (∗) - ν ¯ decays with hadronic tagging at Belle MEASUREMENT of the BRANCHING RATIO of ⋯ M. HUSCHLE et al.

Huschle M., Kuhr T., Heck M., Goldenzweig P., Abdesselam A., Adachi I., Adamczyk K., Aihara H., Al Said S., Arinstein K., Asner D. M., Aushev T., Ayad R., Aziz T., Badhrees I., Bakich A. M., Bansal V., Barberio E., Bhardwaj V., Bhuyan B., Biswal J., Bobrov A., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang P., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., DoleŽal Z., Drásal Z., Dutta D., Eidelman S., Epifanov D., Farhat H., Fast J. E., Ferber T., Frey A., Fulsom B. G., Gaur V., Gabyshev N., Garmash A., Gillard R., Glattauer R., Goh Y. M., Golob B., Grygier J., Hamer P., Hara K., Hara T., Hasenbusch J., Hayasaka K., Hayashii H., He X. H., Heider M., Heller A., Horiguchi T., Hou W. S., Hsu C. L., Iijima T., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Joffe D., Joo K. K., Julius T., Kang K. H., Kato E., Katrenko P., Kawasaki T., Keck T., Kiesling C.

© 2015 American Physical Society. © 2015 American Physical Society. We report a measurement of the branching fraction ratios R(D(∗)) of B¯→D(∗)τ-ν¯τ relative to B¯→D(∗) -ν¯ (where =e or μ) using the full Belle data sample of 772×106BB¯ pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured values are R(D)=0.375±0.064(stat)±0.026(syst) and R(D∗)=0.293±0.038(stat)±0.015(syst). The analysis uses hadronic reconstruction of the tag-side B meson and purely leptonic τ decays. The results are consistent with earlier measurements and do not show a significant deviation from the standard model prediction.