  The anomalously large experimentally measured ratios of the semitauonic decay
$B\rightarrow D^{(*)} +\tau+\nu$ and the corresponding semileptonic
$B\rightarrow D^{*} +\l+\bar{\nu}_l$ 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.
