Measurement of the branching ratio of B ¯ →d (∗)τ- ν ¯ τ relative to B ¯ →d (∗) - ν ¯ decays with hadronic tagging at Belle

M. Huschle, T. Kuhr, M. Heck, P. Goldenzweig, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, T. Aushev, R. Ayad, T. Aziz, I. Badhrees, A. M. Bakich, V. Bansal, E. Barberio, V. Bhardwaj, B. BhuyanJ. Biswal, A. Bobrov, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. DoleŽal, Z. Drásal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, A. Frey, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, R. Gillard, R. Glattauer, Y. M. Goh, B. Golob, J. Grygier, P. Hamer, K. Hara, T. Hara, J. Hasenbusch, K. Hayasaka, H. Hayashii, X. H. He, M. Heider, A. Heller, T. Horiguchi, W. S. Hou, C. L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, E. Kato, P. Katrenko, T. Kawasaki, T. Keck, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, P. Kodyš, S. Korpar, P. KriŽan, P. Krokovny, T. Kumita, A. Kuzmin, Y. J. Kwon, I. S. Lee, C. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, M. Masuda, D. Matvienko, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, G. B. Mohanty, S. Mohanty, A. Moll, H. K. Moon, R. Mussa, K. R. Nakamura, E. Nakano, M. Nakao, T. Nanut, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, C. Oswald, G. Pakhlova, B. Pal, C. W. Park, H. Park, T. K. Pedlar, L. Pesántez, R. Pestotnik, M. Petrič, L. E. Piilonen, C. Pulvermacher, E. RibeŽl, M. Ritter, A. Rostomyan, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, D. Semmler, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, F. Simon, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Steder, J. Stypula, M. Sumihama, T. Sumiyoshi, U. Tamponi, Y. Teramoto, K. Trabelsi, V. Trusov, M. Uchida, T. Uglov, S. Uno, Y. Usov, C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, V. Vorobyev, M. N. Wagner, C. H. Wang, M. Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, E. Won, H. Yamamoto, J. Yamaoka, S. Yashchenko, H. Ye, Y. Yook, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

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.

Original languageEnglish
Article number072014
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume92
Issue number7
DOIs
Publication statusPublished - 2015 Oct 26

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society. © 2015 American Physical Society.

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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