Measurement of the $\tau$ lepton polarization and $R(D^*)$ in the decay $\bar{B} \rightarrow D^* \tau^- \bar{\nu}_\tau$ with one-prong hadronic $\tau$ decays at Belle
Creators: name: Hirose, S.
name: Iijima, T.
name: Adachi, I.
name: Adamczyk, K.
name: Aihara, H.
name: Al Said, S.
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Ayad, R.
name: Aziz, T.
name: Babu, V.
name: Badhrees, I.
name: Bakich, A. M.
name: Bansal, V.
name: Berger, M.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Biswal, J.
name: Bondar, A.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Červenkov, D.
name: Chang, M.-C.
name: Chang, P.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, K.
name: Choi, S.-K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: Czank, T.
name: Dash, N.
name: Di Carlo, S.
name: Doležal, Z.
name: Dutta, D.
name: Eidelman, S.
name: Fast, J. E.
name: Ferber, T.
name: Fulsom, B. G.
name: Garg, R.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Gelb, M.
name: Giri, A.
name: Goldenzweig, P.
name: Golob, B.
name: Guan, Y.
name: Guido, E.
name: Haba, J.
name: Hara, K.
name: Hayasaka, K.
name: Hayashii, H.
name: Hedges, M. T.
name: Higuchi, T.
name: Hou, W.-S.
name: Hsu, C.-L.
name: Inami, K.
name: Inguglia, G.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Jaegle, I.
name: Jeon, H. B.
name: Jin, Y.
name: Julius, T.
name: Kang, K. H.
name: Karyan, G.
name: Kawasaki, T.
name: Kim, D. Y.
name: Kim, J. B.
name: Kim, S. H.
name: Kim, Y. J.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kuhr, T.
name: Kulasiri, R.
name: Kumar, R.
name: Kuzmin, A.
name: Kwon, Y.-J.
name: Lange, J. S.
name: Lee, I. S.
name: Li, L. K.
name: Li, Y.
name: Li Gioi, L.
name: Libby, J.
name: Liventsev, D.
name: Lubej, M.
name: Matsuda, T.
name: Miyabayashi, K.
name: Miyata, H.
name: Mohanty, G. B.
name: Mohanty, S.
name: Moon, H. K.
name: Mori, T.
name: Mussa, R.
name: Nakamura, K. R.
name: Nakao, M.
name: Nanut, T.
name: Nath, K. J.
name: Natkaniec, Z.
name: Niiyama, M.
name: Nisar, N. K.
name: Nishida, S.
name: Ogawa, S.
name: Okuno, S.
name: Ono, H.
name: Pal, B.
name: Pardi, S.
name: Park, C. W.
name: Park, H.
name: Paul, S.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Popov, V.
name: Ritter, M.
name: Rostomyan, A.
name: Rozanska, M.
name: Sakai, Y.
name: Salehi, M.
name: Sandilya, S.
name: Sato, Y.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Schwartz, A. J.
name: Seino, Y.
name: Senyo, K.
name: Sevior, M. E.
name: Shebalin, V.
name: Shibata, T.-A.
name: Shimizu, N.
name: Shiu, J.-G.
name: Simon, F.
name: Sokolov, A.
name: Solovieva, E.
name: Starič, M.
name: Strube, J. F.
name: Stypula, J.
name: Sumihama, M.
name: Sumisawa, K.
name: Sumiyoshi, T.
name: Takizawa, M.
name: Tamponi, U.
name: Tanida, K.
name: Tenchini, F.
name: Trabelsi, K.
name: Uchida, M.
name: Uglov, T.
name: Uno, S.
name: Urquijo, P.
name: Van Hulse, C.
name: Varner, G.
name: Varvell, K. E.
name: Vorobyev, V.
name: Vossen, A.
name: Wang, C. H.
name: Wang, M.-Z.
name: Wang, P.
name: Wang, X. L.
name: Wehle, S.
name: Widmann, E.
name: Won, E.
name: Yamamoto, H.
name: Yamashita, Y.
name: Ye, Hua
name: Yuan, C. Z.
name: Yusa, Y.
name: Zakharov, S.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2017
Subjects: B: pair production
anti-B0: semileptonic decay
tau: hadronic decay
lepton: polarization
tau: polarization
branching ratio: ratio: measured
BELLE
electron positron: annihilation
electron positron: colliding beams
KEK-B
experimental results
anti-B0 --&gt; D*(2010) tau- antineutrino/tau
tau- --&gt; pi- neutrino/tau
tau- --&gt; rho(770)- neutrino/tau

description: With the full data sample of $772 \times 10^6$ $B{\bar B}$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $\bar{B} \rightarrow D^* \tau^- \bar{\nu}_\tau$ is studied with the hadronic $\tau$ decays $\tau^- \rightarrow \pi^- \nu_\tau$ and $\tau^- \rightarrow \rho^- \nu_\tau$. The $\tau$ polarization $P_\tau(D^*)$ in two-body hadronic $\tau$ decays is measured, as well as 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. Our results, $P_\tau(D^*) = -0.38 \pm 0.51 {\rm (stat)} ^{+0.21}_{-0.16} {\rm (syst)}$ and $R(D^*) = 0.270 \pm 0.035{\rm (stat)} ^{+0.028}_{-0.025}{\rm (syst)}$, are consistent with the theoretical predictions of the Standard Model. The polarization values of $P_\tau(D^*) &gt; +0.5$ are excluded at the 90\% confidence level.