  Recent experimental results for the ratio of the branching fractions of $\bar
B\to D^{(*)}\tau\bar \nu_\tau$ and $\bar B\to D^{(*)}\mu\bar \nu_\mu$ decays
came as a surprise and lead to a discussion of possibility to constraining New
Physics 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 is
consistent with the Standard Model within $2\sigma$, and that the test of
compatibility of this ratio with the Standard Model can be done experimentally
with a minimal theory input. We also show that these two decay channels can
provide us with quite good constraints of the New Physics couplings.
