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

PHYSICAL REVIEW LETTERS（2017）

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摘要

We report the first measurement of the tau lepton polarization P-tau(D*) in the decay (B) over bar -> D* tau(-) (v) over bar (tau) as well as a newmeasurement of the ratio of the branching fractions R(D*) = B((B) over bar -> D* tau(-) (v) over bar (tau)) / B((B) over bar -> D* l(-) (v) over bar (l)), where l(-) denotes an electron or a muon, and the tau is reconstructed in the modes tau(-) -> pi(-) v(tau) and tau(-) -> rho(-) v(tau). We use the full data sample of 772 x 10(6) B (B) over bar pairs recorded with the Belle detector at the (KEKB) over bar electron-positron collider. Our results, P-tau(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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Measurement of the τ Lepton Polarization and R(D^{*}) in the Decay B[over ¯]→D^{*}τ^{-}ν[over ¯]_{τ}.

Measurement of the τ Lepton Polarization and R(D^{}) in the Decay B[over ¯]→D^{}τ^{-}ν[over ¯]_{τ}.