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Recent experimental results for the ratio of the branching fractions of $\barB\to D^{(*)}\tau\bar \nu_\tau$ and $\bar B\to D^{(*)}\mu\bar \nu_\mu$ decayscame as a surprise and lead to a discussion of possibility to constraining NewPhysics through these modes. Here we focus on ${\cal B}(\bar B\to D\tau\bar\nu_\tau)/{\cal B}(\bar B\to D\mu\bar \nu_\mu)$ and argue that the result isconsistent with the Standard Model within $2\sigma$, and that the test ofcompatibility of this ratio with the Standard Model can be done experimentallywith a minimal theory input. We also show that these two decay channels canprovide us with quite good constraints of the New Physics couplings.

$\bar B\to D\tau\bar \nu_\tau$ vs. $\bar B\to D\mu\bar \nu_\mu$