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We study possible new physics contributions in $B\to\pi\tau\bar\nu $ and$B\to\tau\bar\nu$ employing the model-independent effective Lagrangian thatdescribes the quark-level transition $b \to u \tau\nu$ at low energies. Thedecay rate of $B\to\pi\tau\bar\nu$ and its theoretical uncertainty areevaluated using the $B\to\pi$ form factors given by recent lattice QCD studies.Comparing theoretical results with the current experimental data,$\mathcal{B}(B\to\pi\tau\bar\nu)<2.5\times 10^{-4}$ and$\mathcal{B}(B\to\tau\bar\nu)=(1.14\pm 0.22)\times 10^{-4}$, we obtainconstraints on the Wilson coefficients that quantify potential new physics. Wealso present the expected sensitivity of the SuperKEKB/Belle~II experiment.

New physics contributions in $B\to\pi\tau\bar\nu$ and $B\to\tau\bar\nu$