New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$

Abstract

Recent experimental results on exclusive semi-tauonic B meson decays, B -> D(*) tau nu, showing sizable deviations from the standard model prediction, suggest a new physics in which the structure of the relevant weak charged interaction may differ from that of the standard model. We study the exclusive semi-tauonic B decays in a model-independent manner using the most general set of four-Fermi interactions in order to clarify possible structures of the charged current in new physics. It turns out that correlations among observables including tau and D* polarizations and q^2 distributions are useful to distinguish possible new physics operators. Further, we investigate some interesting models to exhibit the advantage of our model-independent analysis. As a result, we find that two Higgs doublet models without tree-level FCNC and the minimal supersymmetric standard model with R-parity violation are unlikely to explain the present experimental data, while two Higgs doublet models with FCNC and a leptoquark model are consistent with the data.

29 pages, 8 figures, 2 additional references, Typos and numerical errors in figures are corrected

References in corpus (8)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• On the B to D* tau nu Sensitivity to New Physics
• Models of Yukawa interaction in the two Higgs doublet model, and their collider phenomenology
• Implications of lepton flavor universality violations in B decays
• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• Charged-Higgs effects in a new B -> D tau nu differential decay distribution
• Charged Higgs on $B^{-}\to \tau {\bar{\nu }}_{\tau }$ and $\bar{B}\to P(V)\ell {\bar{\nu }}_{\ell }$

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