Year: 2017
Type: article
Abstract: We report the first measurement of the $\ensuremath{\tau}$ lepton polarization ${P}_{\ensuremath{\tau}}({D}^{*})$ in the decay $\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}}$ as well as a new measurement of the ratio of the branching fractions $R({D}^{*})=\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\tau}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\tau}})/\mathcal{B}(\overline{B}\ensuremath{\rightarrow}{D}^{*}{\ensuremath{\ell}}^{\ensuremath{-}}{\overline{\ensuremath{\nu}}}_{\ensuremath{\ell}})$, where ${\ensuremath{\ell}}^{\ensuremath{-}}$ denotes an electron or a muon, and the $\ensuremath{\tau}$ is reconstructed in the modes ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ and ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\rho}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}}$. We use the full data sample of $772\ifmmode\times\else\texttimes\fi{}1{0}^{6}\text{ }\text{ }B\overline{B}$ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our results, ${P}_{\ensuremath{\tau}}({D}^{*})=\ensuremath{-}0.38\ifmmode\pm\else\textpm\fi{}0.51{(\text{stat})}_{\ensuremath{-}0.16}^{+0.21}(\text{syst})$ and $R({D}^{*})=0.270\ifmmode\pm\else\textpm\fi{}0.035{(\text{stat})}_{\ensuremath{-}0.025}^{+0.028}(\text{syst})$, are consistent with the theoretical predictions of the standard model.
Source: Physical Review Letters
Authors: S. Hirose, T. Iijima, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, A. M. Bakich, V. Bansal, E. Barberio, P. Behera, M. Berger, B. Bhuyan, J. Biswal, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, Y. Choi, D. Cinabro, M. Danilov, N. Dash, S. Di Carlo, J. Dingfelder, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, B. Golob, D. Greenwald, J. Grygier, J. Haba, K. Hara, J. Hasenbusch, K. Hayasaka, H. Hayashii, T. Higuchi, W.-S. Hou, C.-L. Hsu, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, Y. Iwasaki, W. W. Jacobs, I. Jaegle, Y. Jin, D. Joffe, K. K. Joo, T. Julius, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, Y.-J. Kwon, J. S. Lange, C. H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, D. Matvienko, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Mori, R. Mussa, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, H. Ono, Y. Onuki, W. Ostrowicz, P. Pakhlov, G. Pakhlova, B. Pal, C. W. Park, H. Park, S. Paul, L. Pesántez, R. Pestotnik, L. E. Piilonen, K. Prasanth, M. Ritter, A. Rostomyan, M. Rozanska, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, T. Schlüter, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, T.-A. Shibata, J.-G. Shiu, F. Simon, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, K. Sumisawa, T. Sumiyoshi, M. Takizawa, U. Tamponi, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, C. Van Hulse, G. Varner, K. E. Varvell, A. Vossen, C. H. Wang, M.-Z. Wang, P. Wang, M. Watanabe, Y. Watanabe, E. Widmann, E. Won, Y. Yamashita, H. Ye, J. Yelton, C. Z. Yuan, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc
Institutions: Nagoya University, High Energy Accelerator Research Organization, The Graduate University for Advanced Studies, SOKENDAI, Institute of Nuclear Physics, Polish Academy of Sciences, The University of Tokyo, King Abdulaziz University, University of Tabuk, Pacific Northwest National Laboratory, Middle East Technical University, Novosibirsk State University, Siberian Branch of the Russian Academy of Sciences, Budker Institute of Nuclear Physics, Moscow Institute of Physics and Technology, Tata Institute of Fundamental Research, King Abdulaziz City for Science and Technology, The University of Sydney, The University of Melbourne, Indian Institute of Technology Madras, Stefan Meyer Institute for Subatomic Physics, Indian Institute of Technology Guwahati, Jožef Stefan Institute, Wayne State University, University of Maribor, University of Hawaiʻi at Mānoa, University of Hawaii System, Charles University, National Taiwan University, National Central University, Hanyang University, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, National Research Nuclear University MEPhI, Korea Institute of Science & Technology Information, Sungkyunkwan University, Indian Institute of Technology Bhubaneswar, University of Bonn, Deutsches Elektronen-Synchrotron DESY, Karlsruhe Institute of Technology, University of Ljubljana, Technical University of Munich, Niigata University, Nara Women's University, Kavli Institute for the Physics and Mathematics of the Universe, Tohoku University, Indiana University Bloomington, Indiana University, University of Florida, Kennesaw State University, Chonnam National University, Max Planck Institute for Physics, Soongsil University, Korea University, Kyungpook National University, University of Cincinnati, Ludwig-Maximilians-Universität München, Punjab Agricultural University, Yonsei University, Justus-Liebig-Universität Gießen, University of Science and Technology of China, Virginia Tech, University of Pittsburgh, Earthquake Research Institute, University of Tokyo, University of Miyazaki, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, Kyoto University, Toho University, Kanagawa University, Nippon Dental University, École Polytechnique Fédérale de Lausanne, Ikerbasque, University of the Basque Country, Institute of High Energy Physics, Yamagata University, Beihang University, Tokyo Institute of Technology, Excellence Cluster Universe, Institute for High Energy Physics, Tokyo Metropolitan University, Japan Proton Accelerator Research Complex, RIKEN, RIKEN Nishina Center, Showa Pharmaceutical University, University of Turin, National United University, Chinese Academy of Sciences, Institute of High Energy Physics
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Science Foundation, U.S. Department of Energy, Western Carolina University, Rudi Schulte Research Institute, Department of Science and Technology, Ministry of Science and Technology, India, Deutsche Forschungsgemeinschaft, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Austrian Science Fund, Ministry of Science and Technology of the People's Republic of China, Euskal Herriko Unibertsitatea, Ministry of Environment, Ministry of Science, ICT and Future Planning, Korea Institute of Science and Technology Information, National Research Foundation of Korea, Ikerbasque, Basque Foundation for Science, Ministry of Education, Science and Technology, Narodowe Centrum Nauki, Javna Agencija za Raziskovalno Dejavnost RS, Ministry of Education, India, Ministerstwo Edukacji i Nauki, High Energy Accelerator Research Organization, CAS Center for Excellence in Particle Physics, Australian Research Council, Japan Society for the Promotion of Science, Instituto Nazionale di Fisica Nucleare, Universitat Politècnica de València, Great Southern Development Commission, Government of Western Australia, Pacific Northwest National Laboratory
OpenAlex ID: W2560168795