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

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.; Bračko, M.; Browder, T. E.; Červenkov, 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.; Libby, J.; Liventsev, D.; Lubej, M.; Matsuda, T.; Miyabayashi, K.; Miyata, H.; Mohanty, G. B.; Mohanty, S.; Moon, H. K.; Mori, T.; Mussa, R.; Nakamura, K. R.; Nakao, M.; Nanut, T.; Nath, K. J.; Natkaniec, Z.; Niiyama, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Okuno, S.; Ono, H.; Pal, B.; Pardi, S.; Park, C. W.; Park, H.; Paul, S.; Pestotnik, R.; Piilonen, L. E.; Popov, V.; Ritter, M.; Rostomyan, A.; Rozanska, M.; Sakai, Y.; Salehi, M.; Sandilya, S.; Sato, Y.; Schneider, O.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shebalin, V.; Shibata, T. -A.; Shimizu, N.; Shiu, J. -G.; Simon, F.; Sokolov, A.; Solovieva, E.; Starič, M.; Strube, J. F.; Stypula, J.; Sumihama, M.; Sumisawa, K.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uglov, T.; Uno, S.; Urquijo, P.; Van Hulse, C.; Varner, G.; Varvell, K. E.; Vorobyev, V.; Vossen, A.; Wang, C. H.; Wang, M. -Z.; Wang, P.; Wang, X. L.; Wehle, S.; Widmann, E.; Won, E.; Yamamoto, H.; Yamashita, Y.; Ye, H.; Yuan, C. Z.; Yusa, Y.; Zakharov, S.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.; Zhulanov, V.; Zupanc, A.

doi:10.1103/PhysRevD.97.012004

Title: Measurement of the $τ$ lepton polarization and $R (D^{})$ in the decay $\bar{B} \to D^{} τ^{-} {\bar{ν}}_{τ}$ with one-prong hadronic $τ$ decays at Belle

Journal Article · Wed Jan 10 00:00:00 EST 2018 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.97.012004· OSTI ID:1416426

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. more »

With the full data sample of $772 \times 10^{6} B \bar{B}$ pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay $\bar{B} \to D^{*} τ^{-} {\bar{ν}}_{τ}$ is studied with the hadronic $τ$ decays $τ^{-} \to π^{-} ν_{τ}$ and $τ^{-} \to ρ^{-} ν_{τ}$ . The $τ$ polarization $P_{τ} (D^{*})$ in two-body hadronic $τ$ decays is measured, as well as the ratio of the branching fractions $R (D^{*}) = B (\bar{B} \to D^{*} τ^{-} {\bar{ν}}_{τ}) / B (\bar{B} \to D^{*} ℓ^{-} {\bar{ν}}_{ℓ})$ , where $ℓ^{-}$ denotes an electron or a muon. Our results, $P_{τ} (D^{*}) = - 0.38 \pm 0.51 {(stat)}_{- 0.16}^{+ 0.21} (syst)$ and $R (D^{*}) = 0.270 \pm 0.035 {(stat)}_{- 0.025}^{+ 0.028} (syst)$ , are consistent with the theoretical predictions of the standard model. The polarization values of $P_{τ} (D^{*}) > + 0.5$ are excluded at the 90% confidence level.

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Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: The Belle Collaboration

Grant/Contract Number:: SC0009973; AC05-76RL01830

OSTI ID:: 1416426

Alternate ID(s):: OSTI ID: 1578184; OSTI ID: 1594345

Report Number(s):: PNNL-SA-132801; PRVDAQ; 012004

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 97 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 125 works

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