${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_c\tau {\bar{\nu }}_{\tau }$ Decay in the Standard Model and with New Physics

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 ${\mathrm{\Lambda }}_b\to {\mathrm{\Lambda }}_c\tau {\bar{\nu }}_{\tau }$ 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.