Measurement of the $τ$ lepton polarization and $R(D^*)$ in the decay $\bar{B} \to D^* τ^- \barν_τ$
Creators: name: Hirose, S.
name: Iijima, T.
name: Adachi, I.
name: Adamczyk, K.
name: Aihara, H.
name: Said, S. Al
name: Asner, D. M.
name: Atmacan, H.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Badhrees, I.
name: Bakich, A. M.
name: Bansal, V.
name: Barberio, E.
name: Behera, P.
name: Berger, M.
name: Bhuyan, B.
name: Biswal, J.
name: Bondar, A.
name: Bonvicini, G.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Červenkov, D.
name: Chang, P.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Chistov, R.
name: Cho, K.
name: Choi, Y.
name: Cinabro, D.
name: Danilov, M.
name: Dash, N.
name: Di Carlo, S.
name: Dingfelder, J.
name: Doležal, Z.
name: Drásal, Z.
name: Dutta, D.
name: Eidelman, S.
name: Epifanov, D.
name: Farhat, H.
name: Fast, J. E.
name: Ferber, T.
name: Fulsom, B. G.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Goldenzweig, P.
name: Golob, B.
name: Greenwald, D.
name: Grygier, J.
name: Haba, J.
name: Hara, K.
name: Hasenbusch, J.
name: Hayasaka, K.
name: Hayashii, H.
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, Y.
name: Jacobs, W. W.
name: Jaegle, I.
name: Jin, Y.
name: Joffe, D.
name: Joo, K. K.
name: Julius, T.
name: Kato, Y.
name: Kawasaki, T.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, D. Y.
name: Kim, J. B.
name: Kim, K. T.
name: Kim, M. J.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Križan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kulasiri, R.
name: Kumar, R.
name: Kwon, Y. -J.
name: Lange, J. S.
name: Li, C. H.
name: Li, L.
name: Li, Y.
name: Gioi, L. Li
name: Libby, J.
name: Liventsev, D.
name: Lubej, M.
name: Luo, T.
name: MacNaughton, J.
name: Masuda, M.
name: Matsuda, T.
name: Matvienko, D.
name: Miyabayashi, K.
name: Miyake, H.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moon, H. K.
name: Mori, T.
name: Mussa, R.
name: Nakao, M.
name: Nanut, T.
name: Nath, K. J.
name: Natkaniec, Z.
name: Nayak, M.
name: Niiyama, M.
name: Nisar, N. K.
name: Nishida, S.
name: Ogawa, S.
name: Okuno, S.
name: Ono, H.
name: Onuki, Y.
name: Ostrowicz, W.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pal, B.
name: Park, C. W.
name: Park, H.
name: Paul, S.
name: Pesántez, L.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Prasanth, K.
name: Ritter, M.
name: Rostomyan, A.
name: Rozanska, M.
name: Sakai, Y.
name: Sandilya, S.
name: Santelj, L.
name: Sanuki, T.
name: Sato, Y.
name: Savinov, V.
name: Schlüter, T.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Seino, Y.
name: Senyo, K.
name: Seon, O.
name: Sevior, M. E.
name: Shebalin, V.
name: Shen, C. P.
name: Shibata, T. -A.
name: Shiu, J. -G.
name: Simon, F.
name: Sokolov, A.
name: Solovieva, E.
name: Starič, M.
name: Strube, J. F.
name: Sumisawa, K.
name: Sumiyoshi, T.
name: Takizawa, M.
name: Tamponi, U.
name: Tenchini, F.
name: Trabelsi, K.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Ushiroda, Y.
name: Usov, Y.
name: Van Hulse, C.
name: Varner, G.
name: Varvell, K. E.
name: Vossen, A.
name: Wang, C. H.
name: Wang, M. -Z.
name: Wang, P.
name: Watanabe, M.
name: Watanabe, Y.
name: Widmann, E.
name: Won, E.
name: Yamashita, Y.
name: Ye, H.
name: Yelton, J.
name: Yuan, C. Z.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report the first measurement of the $τ$ lepton polarization $P_τ(D^*)$ in the decay $\bar{B} \rightarrow D^* τ^- \barν_τ$ as well as a new measurement of the ratio of the branching fractions $R(D^{*}) = \mathcal{B}(\bar {B} \rightarrow D^* τ^- \barν_τ) / \mathcal{B}(\bar{B} \rightarrow D^* \ell^- \barν_\ell)$, where $\ell^-$ denotes an electron or a muon, and the $τ$ is reconstructed in the modes $τ^- \rightarrow π^- ν_τ$ and $τ^- \rightarrow ρ^- ν_τ$. We use the full data sample of $772 \times 10^6$ $B{\bar B}$ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our results, $P_τ(D^*) = -0.38 \pm 0.51 {\rm (stat.)} ^{+0.21}_{-0.16} {\rm (syst.)}$ 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.
description: 7 pages, 2 figures, submitted to Physical Review Letters; one figure was removed from the first version