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Recent experimental results for the ratios of the branching fractions of thedecays $\bar{B} \to D^{(*)} \tau \bar\nu$ and $\bar{B} \to D^{(*)} \mu \bar\nu$came as a surprise and lead to a discussion of possibility of testing NewPhysics beyond the Standard Model through these modes. We show that these decaychannels can provide us with good constraints on New Physics and several NewPhysics cases are favored by the present experimental data. In order todiscriminate various New Physics scenarios, we examine the $q^2$ distributionsand estimate the sensitivity of this potential measurement at theSuperKEKB/Belle II experiment.

Probing New Physics with $q^2$ distributions in $\bar{B} \to D^{(*)} \tau \bar\nu$