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Recently, several indications of lepton non-universality observables havebeen perceived in semileptonic $B$ meson decay processes, both in theneutral-current ($b \to s ll $) and charged-current ($b \to c l \bar \nu_l$)transitions. Influenced by these fascinating quotients, we examine thesemileptonic decays involving the $b \to c l \bar \nu_l$ quark leveltransitions. We execute it through a model independent analysis in order toprobe the nature of new physics. Taking into consideration the most generaleffective Hamiltonian, we scrutinize $\Lambda_b \to \Lambda_c \tau \bar\nu_\tau$, $ B_c^+ \to \eta_c \tau^+ \nu_\tau$, and $ B \to D^{**} \tau \bar\nu_\tau$ (where $D^{**} = \{D^*_0, D_1^*, D_1, D_2^*\}$ are the four lightestexcited charm mesons) processes, in the presence of new physics. We perform aglobal fit to different sets of new coefficients, making use of themeasurements on $R_{D}$, $R_{D^{*}}$, $R_{J/\psi}$, $P_{\tau}^{D^*}$ and theupper limit on Br($B_c^+ \to \tau^+ \nu_\tau$). We then inspect the effect ofconstrained new couplings on the branching ratios, forward-backward asymmetryparameters, lepton non-universality ratios (LNU), lepton and hadronpolarization asymmetries of these decay modes.

Delving into new physics in semileptonic $b \to c \tau \bar \nu$ transitions