Measurement of the τ Lepton Polarization and R(D^{*}) in the Decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ}.
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
We report the first measurement of the τ lepton polarization P_{τ}(D^{*}) in the decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ} as well as a new measurement of the ratio of the branching fractions R(D^{*})=B(B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ})/B(B[over ¯]→D^{*}ℓ^{-}ν[over ¯]_{ℓ}), where ℓ^{-} denotes an electron or a muon, and the τ is reconstructed in the modes τ^{-}→π^{-}ν_{τ} and τ^{-}→ρ^{-}ν_{τ}. We use the full data sample of 772×10^{6} BB[over ¯] pairs recorded with the Belle detector at the KEKB electron-positron collider. Our results, P_{τ}(D^{*})=-0.38±0.51(stat)_{-0.16}^{+0.21}(syst) and R(D^{*})=0.270±0.035(stat)_{-0.025}^{+0.028}(syst), are consistent with the theoretical predictions of the standard model.
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