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      Measurement of the Ratio of the \({B}^{0}\to {D}^{*-}{\tau }^{+}{\nu }_{\tau }\) and \({B}^{0}\to {D}^{*-}{\mu }^{+}{\nu }_{\mu }\) Branching Fractions Using Three-Prong \(\tau \) -Lepton Decays

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      Physical Review Letters
      American Physical Society (APS)

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          Leptoquarks in lepton-quark collisions

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            Averages of b-hadron, c-hadron, and \(\tau \) τ -lepton properties as of summer 2016

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              On the B to D* tau nu Sensitivity to New Physics

              B physics has played a prominent role in investigations of new physics effects at low-energies. Presently, the largest discrepancy between a standard model prediction and experimental measurements appears in the branching ratio of the charged current mediated B to tau nu decay, where the large tau mass lifts the helicity suppression arising in leptonic B decays. Less significant systematic deviations are also observed in the semileptonic B to D(*) tau nu rates. Due to the rich spin structure of the final state, the decay mode B to D* tau nu offers a number of tests of such possible standard model deviations. We investigate the most general set of lowest dimensional effective operators leading to helicity suppressed modifications of b to c (semi)leptonic transitions. We explore such contributions to the B to D* tau nu decay amplitudes by determining the differential decay rate, longitudinal D* polarization fraction, D* - tau opening angle asymmetry and the tau helicity asymmetry. We identify the size of possible new physics contributions constrained by the present B to D(*) tau nu rate measurements and find significant modifications are still possible in all of them. In particular, the opening angle asymmetry can be shifted by almost 30%, relative to the standard model prediction, while the tau helicity asymmetry can still deviate by as much as 80%.
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                Author and article information

                Journal
                PRLTAO
                Physical Review Letters
                Phys. Rev. Lett.
                American Physical Society (APS)
                0031-9007
                1079-7114
                April 2018
                April 25 2018
                : 120
                : 17
                Article
                10.1103/PhysRevLett.120.171802
                274eee3f-0908-4799-94d1-69f61884a023
                © 2018

                https://creativecommons.org/licenses/by/4.0/

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