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Park, C. Van Hulse, C. Z. Yuan, D. Cinabro, D. Epifanov, D. Greenwald, D. Joffe, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. Y. Kim, E. Nakano, E. Solovieva, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Pakhlova, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. B. Jeon, H. Farhat, H. Hayashii, H. K. Moon, H. Miyata, H. Yamamoto, I. Badhrees, I. Jaegle, J. Biswal, J. B. Kim, J. E. Fast, J.-G. Shiu, J. Hasenbusch, J. Libby, J. Rauch, J. S. Lange, J. Yamaoka, J. Yelton, K. Adamczyk, K. Chilikin, K. Cho, K. Hara, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. Miyabayashi, K. M. Williams, K. Negishi, K. R. Nakamura, K. Senyo, K. T. Kim, K. Trabelsi, L. Li, L. Li Gioi, L. PesR. Pestotnik, L. Santelj, M. BraD. P. Chang, M. Danilov, M. E. Sevior, M. J. Kim, M. Masuda, M. Nakao, M. Nayak, M. PetriL. E. Piilonen, M. Rozanska, M. Takizawa, M. Uchida, M. V. Purohit, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, O. Seon, P. Behera, P. Goldenzweig, P. Katrenko, P. KodyS. Korpar, P. Krokovny, P. Pakhlov, P. Urquijo, P. Wang, R. Ayad, R. Chistov, R. Itoh, R. Kumar, R. Mizuk, S. Di Carlo, S. Eidelman, S. Hirose, S. H. Kim, S. L. Olsen, S. Nishida, S. Ogawa, S. Okuno, S. Paul, S. Sandilya, S. StaniM. StariJ. F. Strube, S. Uno, T.-A. Shibata, T. Aushev, T. Aziz, T. Ferber, T. Hara, (The Belle collaboration), T. Horiguchi, T. Iijima, T. Julius, T. Kawasaki, T. K. Pedlar, T. Kuhr, T. Luo, T. Matsuda, T. Nanut, T. SchlO. Schneider, T. Sumiyoshi, U. Tamponi, V. Babu, V. Bansal, V. Bhardwaj, V. Chekelian, V. Chobanova, V. Gaur, V. Savinov, V. Shebalin, V. Vorobyev, V. Zhilich, V. Zhukova, V. Zhulanov, W.-S. Hou, Y. Choi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Kato, Y. Li, Y. Onuki, Y. Sakai, Y. Sato, Y. Seino, Y. Ushiroda, Y. Usov, Y. Watanabe, Y. Yamashita, Y. Yook, Y. Yusa, Z. DoleD. Dutta, Z. Natkaniec, Z. P. Zhang","submitted_at":"2016-07-27T00:38:22Z","abstract_excerpt":"We report a measurement of the ratio ${\\cal R}(D^*) = {\\cal B}(\\bar{B}^0 \\rightarrow D^{*+} \\tau^- \\bar{\\nu}_{\\tau})/{\\cal B}(\\bar{B}^0 \\rightarrow D^{*+} \\ell^- \\bar{\\nu}_{\\ell})$, where $\\ell$ denotes an electron or a muon. The results are based on a data sample containing $772\\times10^6$ $B\\bar{B}$ pairs recorded at the $\\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider. We select a sample of $B^0 \\bar{B}^0$ pairs by reconstructing both $B$ mesons in semileptonic decays to $D^{*\\mp} \\ell^{\\pm}$. 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Bozek, A. Chen, A. Garmash, A. Ishikawa, A. J. Schwartz, A. M. Bakich, A. Moll, A. Rostomyan, A. Vinokurova, A. Zupanc, B. Bhuyan, B. G. Cheon, B. G. Fulsom, B. Golob, B. Pal, B. Shwartz, C. H. Li, C. H. Wang, C. P. Shen, C. Schwanda, C.-S. Park, C. Van Hulse, C. Z. Yuan, D. Cinabro, D. Epifanov, D. Greenwald, D. Joffe, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. Y. Kim, E. Nakano, E. Solovieva, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Pakhlova, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. B. Jeon, H. Farhat, H. Hayashii, H. K. Moon, H. Miyata, H. Yamamoto, I. Badhrees, I. Jaegle, J. Biswal, J. B. Kim, J. E. Fast, J.-G. Shiu, J. Hasenbusch, J. Libby, J. Rauch, J. S. Lange, J. Yamaoka, J. Yelton, K. Adamczyk, K. Chilikin, K. Cho, K. Hara, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. Miyabayashi, K. M. Williams, K. Negishi, K. R. Nakamura, K. Senyo, K. T. Kim, K. Trabelsi, L. Li, L. Li Gioi, L. PesR. Pestotnik, L. Santelj, M. 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Sato, Y. Seino, Y. Ushiroda, Y. Usov, Y. Watanabe, Y. Yamashita, Y. Yook, Y. Yusa, Z. DoleD. Dutta, Z. Natkaniec, Z. P. Zhang","submitted_at":"2016-07-27T00:38:22Z","abstract_excerpt":"We report a measurement of the ratio ${\\cal R}(D^*) = {\\cal B}(\\bar{B}^0 \\rightarrow D^{*+} \\tau^- \\bar{\\nu}_{\\tau})/{\\cal B}(\\bar{B}^0 \\rightarrow D^{*+} \\ell^- \\bar{\\nu}_{\\ell})$, where $\\ell$ denotes an electron or a muon. The results are based on a data sample containing $772\\times10^6$ $B\\bar{B}$ pairs recorded at the $\\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider. We select a sample of $B^0 \\bar{B}^0$ pairs by reconstructing both $B$ mesons in semileptonic decays to $D^{*\\mp} \\ell^{\\pm}$. 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