$B_c \to D^{(*)}τ\bar ν_τ$ processes in an effective field theory approach
We present a compressive study on rare semileptonic $B_c \to D^{(*)}τ\bar ν_τ$ decays involving $b \to u τ\bar ν_τ$ quark level transitions in an effective field theory approach. We consider the presence of an additional (pseudo)vector and (pseudo)scalar type interactions which can be either complex or real and constrain the new couplings using the existing data on $R_{D^{(*)}}$, $R_{J/ψ}$, $R_π^l$, Br($B_{u,c} \to τ\bar ν_τ$) and Br($B \toπτ\bar ν_τ$) parameters. In order to segregate the sensitivity of new coefficients, we check the effects of these couplings on the branching ratios, lepton non-universality and various angular observables of $B_c \to D^{(*)}τ\bar ν_τ$ processes.
hep-ph↗