  Recently hints of lepton flavor non-universality emerged when the BaBar
Collaboration observed deviations from the standard model predictions in
$R(D^{(*)}) \equiv {\cal B}({\bar B} \to D^{(*)+} \tau^- {\bar\nu}_\tau) /
{\cal B}({\bar B} \to D^{(*)+} \ell^- {\bar\nu}_\ell)$ ($\ell =e,\mu$). Another
test of this non-universality can be in the semi leptonic
$\Lambda_{b}\to\Lambda_{c}\tau\bar{\nu}_{\tau}$ decay. In this work we present
predictions for this decay in the standard model and in the presence of
new-physics operators with different Lorentz structures. We present the most
general four-fold angular distribution for this decay including new physics.
For phenomenology, we focus on predictions for the decay rate and the
differential distribution in the momentum transfer squared $q^2$. In
particular, we calculate $R_{\Lambda_{b}} = \frac{BR[\Lambda_b \to \Lambda_c
\tau \bar{\nu}_{\tau}]}{BR[\Lambda_b \to \Lambda_c \ell \bar{\nu}_{\ell}]}$
where $\ell$ represents $\mu$ or $e$, and find the standard model prediction to
be around $0.3$ while the new physics operators can increase or slightly
decrease this value.
