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Motivated by the anomalies present in $b \to u$ and $b \to c$ semileptonicdecays, we study the corresponding $B_s \to (K,K^*) \tau \nu$ and $B \to \pi\tau \nu$ decays within an effective field theory formalism. Our analysis isbased on a strict model dependent assumption, i.e., we assume that $b \to u$and $b \to c$ transition decays exhibit similar new physics pattern. We giveprediction of various observables such as the branching fraction, ratio ofbranching ratio, lepton side forward-backward asymmetry, longitudinalpolarization fraction of the charged lepton and convexity parameter in thestandard model and in the presence of vector type new physics couplings.

Probing new physics in $B_s \to (K,K^*)\tau \nu$ and $B \to \pi \tau \nu$ decays