Motivated by the first observation of $Λ_b\toΛ_c~τ\barν$ by LHCb, we discuss various observables that can be derived from angular distribution of this decay which, if measured, could be essential for explanation of the $b\to cτ\barν$ anomalies. Furthermore, we show that the measurement of $R_{Λ_c}=\mathcal{B}(Λ_b\toΛ_cτ\barν)/\mathcal{B}(Λ_b\toΛ_cμ\barν)$ does not change the current global picture arising from $R_D^{\rm}$ and $R_{D^*}^{\rm}$ being larger than predicted in the Standard Model. Finally, we show the example of a few angular observables, with and without a secondary decay, that could have a strong discriminating power on New Physics.

6 pages, 4 figures, contribution to the 2022 EW session of the 56th Rencontres de Moriond. Based on arXiv:2209.13409