(\Lambda_b \to \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 \(\Lambda_{b}\to\Lambda_{c}\tau\bar{\nu}_{\tau}\) 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.