Semitauonic B Decay Anomaly

The anomalously large experimentally measured ratios of the semitauonic decay $B\rightarrow D^{(*)} +τ+ν$ and the corresponding semileptonic $B\rightarrow D^{*} +ł+\barν_l$ disagree with the predictions of the standard E.W + QCD model(S.M). We briefly comment on this disagreement and on possible new physics explanations which are rather constrained and difficult to implement.

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