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Measurement of the τ lepton polarization and R(D*) in the decay B¯→D*τ−ν¯τ with one-prong hadronic τ decays at Belle
Date Issued
01-01-2018
Author(s)
Hirose, S.
Iijima, T.
Adachi, I.
Adamczyk, K.
Aihara, H.
Al Said, S.
Asner, D. M.
Atmacan, H.
Aushev, T.
Ayad, R.
Aziz, T.
Babu, V.
Badhrees, I.
Bakich, A. M.
Bansal, V.
Berger, M.
Bhardwaj, V.
Bhuyan, B.
Biswal, J.
Bondar, A.
Bozek, A.
BraÄ ko, M.
Browder, T. E.
ÄŒervenkov, D.
Chang, M. C.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, K.
Choi, S. K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Czank, T.
Dash, N.
Di Carlo, S.
DoleŽal, Z.
Dutta, D.
Eidelman, S.
Fast, J. E.
Ferber, T.
Fulsom, B. G.
Garg, R.
Gaur, V.
Gabyshev, N.
Garmash, A.
Gelb, M.
Giri, A.
Goldenzweig, P.
Golob, B.
Guan, Y.
Guido, E.
Haba, J.
Hara, K.
Hayasaka, K.
Hayashii, H.
Hedges, M. T.
Higuchi, T.
Hou, W. S.
Hsu, C. L.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Jaegle, I.
Jeon, H. B.
Jin, Y.
Julius, T.
Kang, K. H.
Karyan, G.
Kawasaki, T.
Kim, D. Y.
Kim, J. B.
Kim, S. H.
Kim, Y. J.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kotchetkov, D.
KriŽan, P.
Kroeger, R.
Krokovny, P.
Kuhr, T.
Kulasiri, R.
Kumar, R.
Kuzmin, A.
Kwon, Y. J.
Lange, J. S.
Lee, I. S.
Li, L. K.
Li, Y.
Li Gioi, L.
Indian Institute of Technology, Madras
Liventsev, D.
Lubej, M.
Matsuda, T.
Miyabayashi, K.
Abstract
With the full data sample of 772×106 BB̄ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay B̄→D∗τ-ν̄τ is studied with the hadronic τ decays τ-→π-ντ and τ-→ρ-ντ. The τ polarization Pτ(D∗) in two-body hadronic τ decays is measured, as well as the ratio of the branching fractions R(D∗)=B(B̄→D∗τ-ν̄τ)/B(B̄→D∗-ν̄), where - denotes an electron or a muon. Our results, Pτ(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. The polarization values of Pτ(D∗)>+0.5 are excluded at the 90% confidence level.
Volume
97