  We perform a comprehensive study of the impact of new-physics operators with
different Lorentz structures on $\BDstarellnu$ decays, $(\ell = e, \mu, \tau $)
involving the $b \to c l \nu_\ell$ transition. We present the full three angle
and $q^2$ angular distribution with new physics operators with complex
couplings. Various observables are constructed from the angular distribution
with special focus on the CP violating triple product asymmetries which vanish
in the Standard Model without any hadronic complications. Two of the three
triple products are only sensitive to vector/axial vector new physics
operators. %and do not depend on pseudoscalar new physics. Hence, the
measurements of non-zero triple-product asymmetries will be a clear sign of new
physics and a strong signal for vector/axial vector new physics operators. Even
though we focus on $\tau$ final state, one can use the triple-products to
search for new physics with $e$ and $\mu$ in the final state.
