{"paper":{"title":"Measurement of the $\\tau$ lepton polarization and $R(D^*)$ in the decay $\\bar{B} \\to D^* \\tau^- \\bar{\\nu}_\\tau$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A. Bondar, A. Bozek, A. Chen, A. Garmash, A. Ishikawa, A. M. Bakich, A. Rostomyan, A. Sokolov, A. Vossen, A. Zupanc (The Belle Collaboration), B. Bhuyan, B. G. Cheon, B. G. Fulsom, B. Golob, B. Pal, C. H. Li, C. H. Wang, C. Kiesling, C.-L. Hsu, C. P. Shen, C. Schwanda, C. Van Hulse, C. W. Park, C. Z. Yuan, D. Cinabro, D. Dutta, D. Epifanov, D. Greenwald, D. Joffe, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Solovieva, E. Widmann, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Pakhlova, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. Farhat, H. Hayashii, H. Kichimi, H. K. Moon, H. Miyake, H. Miyata, H. Ono, H. Park, H. Ye, I. Adachi, I. Badhrees, I. Jaegle, J. Biswal, J. B. Kim, J. Dingfelder, J. E. Fast, J. F. Strube, J. Grygier, J.-G. Shiu, J. Haba, J. Hasenbusch, J. Libby, J. MacNaughton, J. S. Lange, J. Yelton, K. Adamczyk, K. Chilikin, K. Cho, K. E. Varvell, K. Hara, K. Hayasaka, K. Inami, K. J. Nath, K. Kinoshita, K. K. Joo, K. Miyabayashi, K. Prasanth, K. Senyo, K. Sumisawa, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Li, L. Li Gioi, L. Pes\\'antez, L. Santelj, M. Berger, M. Bra\\v{c}ko, M. Danilov, M. E. Sevior, M. J. Kim, M. Lubej, M. Masuda, M. Nakao, M. Nayak, M. Niiyama, M. Ritter, M. Rozanska, M. Stari\\v{c}, M. Takizawa, M. Uchida, M. Watanabe, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, O. Schneider, O. Seon, P. Behera, P. Chang, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Urquijo, P. Wang, R. Ayad, R. Chistov, R. Itoh, R. Kulasiri, R. Kumar, R. Mizuk, R. Mussa, R. Pestotnik, S. Al Said, S. Di Carlo, S. Eidelman, S. Hirose, S. H. Kim, S. Korpar, S. Nishida, S. Ogawa, S. Okuno, S. Paul, S. Sandilya, S. Uno, T.-A. Shibata, T. Aushev, T. E. Browder, T. Ferber, T. Higuchi, T. Iijima, T. Julius, T. Kawasaki, T. Kuhr, T. Luo, T. Matsuda, T. Mori, T. Nanut, T. Sanuki, T. Schl\\\"uter, T. Sumiyoshi, T. Uglov, U. Tamponi, V. Aulchenko, V. Babu, V. Bansal, V. Gaur, V. Savinov, V. Shebalin, V. Zhilich, V. Zhulanov, W. Ostrowicz, W.-S. Hou, W. W. Jacobs, Y. Choi, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Kato, Y. Li, Y. Onuki, Y. Sakai, Y. Sato, Y. Seino, Y. Unno, Y. Ushiroda, Y. Usov, Y. Watanabe, Y. Yamashita, Z. Dole\\v{z}al, Z. Dr\\'asal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2016-12-02T01:03:01Z","abstract_excerpt":"We report the first measurement of the $\\tau$ lepton polarization $P_\\tau(D^*)$ in the decay $\\bar{B} \\rightarrow D^* \\tau^- \\bar{\\nu}_\\tau$ as well as a new measurement of the ratio of the branching fractions $R(D^{*}) = \\mathcal{B}(\\bar {B} \\rightarrow D^* \\tau^- \\bar{\\nu}_\\tau) / \\mathcal{B}(\\bar{B} \\rightarrow D^* \\ell^- \\bar{\\nu}_\\ell)$, where $\\ell^-$ denotes an electron or a muon, and the $\\tau$ is reconstructed in the modes $\\tau^- \\rightarrow \\pi^- \\nu_\\tau$ and $\\tau^- \\rightarrow \\rho^- \\nu_\\tau$. We use the full data sample of $772 \\times 10^6$ $B{\\bar B}$ pairs recorded with the B"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.00529","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}