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

Journal Article (Journal Article)

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.

Full Text

Duke Authors

Cited Authors

  • Hirose, S; Iijima, T; Adachi, I; Adamczyk, K; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aushev, T; Ayad, R; Aziz, T; Babu, V; Badhrees, I; Bakich, AM; Bansal, V; Berger, M; Bhardwaj, V; Bhuyan, B; Biswal, J; Bondar, A; Bozek, A; Bračko, M; Browder, TE; Červenkov, D; Chang, MC; Chang, P; Chekelian, V; Chen, A; Cheon, BG; Chilikin, K; Cho, K; Choi, SK; Choi, Y; Choudhury, S; Cinabro, D; Czank, T; Dash, N; Di Carlo, S; DoleŽal, Z; Dutta, D; Eidelman, S; Fast, JE; Ferber, T; Fulsom, BG; 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, MT; Higuchi, T; Hou, WS; Hsu, CL; Inami, K; Inguglia, G; Ishikawa, A; Itoh, R; Iwasaki, M; Jaegle, I; Jeon, HB; Jin, Y; Julius, T; Kang, KH; Karyan, G; Kawasaki, T; Kim, DY; Kim, JB; Kim, SH; Kim, YJ; Kinoshita, K; Kodyš, P; Korpar, S; Kotchetkov, D; KriŽan, P; Kroeger, R; Krokovny, P; Kuhr, T; Kulasiri, R; Kumar, R; Kuzmin, A; Kwon, YJ; Lange, JS; Lee, IS; Li, LK; Li, Y; Li Gioi, L; Libby, J; Liventsev, D; Lubej, M; Matsuda, T; Miyabayashi, K

Published Date

  • January 1, 2018

Published In

Volume / Issue

  • 97 / 1

Electronic International Standard Serial Number (EISSN)

  • 2470-0029

International Standard Serial Number (ISSN)

  • 2470-0010

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.97.012004

Citation Source

  • Scopus