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In a recent paper we performed a comprehensive study of the impact ofnew-physics operators with different Lorentz structures on $\BDstarellnu$decays, $\ell = e^-, \mu^-, \tau^- $, involving the $b \to c l \nu_\ell$transition. In this work we extend the previous calculation by including tensoroperators. In the case of $\BDstartaunu $, we present the full three angle and$q^2$ angular distribution with tensor new physics operators with complexcouplings. The impact of the tensor operators on various observables in theangular distribution, specially the azimuthal observables including the CPviolating triple product asymmetries are discussed. It is shown that theseazimuthal observables are very useful in discriminating different new physicsoperators. Finally we consider new physics leptoquark models with tensorinteractions and show how the presence of additional scalar operators modifythe predictions of the tensor operators.

The Azimuthal $B \to D^{*} \tau^{-} \bar{\nu_\tau}$ Angular Distribution with Tensor Operators