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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 chargedinteraction may differ from that of the standard model. We study the exclusivesemi-tauonic B decays in a model-independent manner using the most general setof four-Fermi interactions in order to clarify possible structures of thecharged current in new physics. It turns out that correlations amongobservables including tau and D* polarizations and q^2 distributions are usefulto distinguish possible new physics operators. Further, we investigate someinteresting models to exhibit the advantage of our model-independent analysis.As a result, we find that two Higgs doublet models without tree-level FCNC andthe minimal supersymmetric standard model with R-parity violation are unlikelyto explain the present experimental data, while two Higgs doublet models withFCNC and a leptoquark model are consistent with the data.

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