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    Measurement of R(D) and R(D*) with a Semileptonic Tagging Method

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    Author
    Caria, G; Urquijo, P; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aushev, T; Babu, V; Badhrees, I; ...
    Date
    2020-04-24
    Source Title
    Physical Review Letters
    Publisher
    AMER PHYSICAL SOC
    University of Melbourne Author/s
    Urquijo, Phillip
    Affiliation
    School of Physics
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Caria, G., Urquijo, P., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aushev, T., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A. M., Behera, P., Beleno, C., Bennett, J., Bhuyan, B., Bilka, T., Biswal, J., Bozek, A. ,... Zhulanov, V. (2020). Measurement of R(D) and R(D*) with a Semileptonic Tagging Method. PHYSICAL REVIEW LETTERS, 124 (16), https://doi.org/10.1103/PhysRevLett.124.161803.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/252056
    DOI
    10.1103/PhysRevLett.124.161803
    Abstract
    The experimental results on the ratios of branching fractions R(D)=B(B[over ¯]→Dτ^{-}ν[over ¯]_{τ})/B(B[over ¯]→Dℓ^{-}ν[over ¯]_{ℓ}) and 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, show a long-standing discrepancy with the standard model predictions, and might hint at a violation of lepton flavor universality. We report a new simultaneous measurement of R(D) and R(D^{*}), based on a data sample containing 772×10^{6}  BB[over ¯] events recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e^{+}e^{-} collider. In this analysis the tag-side B meson is reconstructed in a semileptonic decay mode and the signal-side τ is reconstructed in a purely leptonic decay. The measured values are R(D)=0.307±0.037±0.016 and R(D^{*})=0.283±0.018±0.014, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the standard model predictions within 0.2, 1.1, and 0.8 standard deviations for R(D), R(D^{*}), and their combination, respectively. This work constitutes the most precise measurements of R(D) and R(D^{*}) performed to date as well as the first result for R(D) based on a semileptonic tagging method.

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