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We revisit the decay $\Lambda_b^0\to \Lambda_c^+ \ell^-\bar\nu$ ($\ell =e,\mu,\tau$) with a subsequent two-body decay $\Lambda_c^+ \to \Lambda^0 \pi^+$in the Standard Model and in generic New Physics models. The decay's jointfour-differential angular distribution can be expressed in terms of ten angularobservables, assuming negligible polarization of the initial $\Lambda_b$ state.We present compact analytical results for all angular observables, whichenables us to discuss their possible New Physics reach. We find that the decayat hand probes more and complementary independent combinations of Wilsoncoefficients compared to its mesonic counter parts $\bar{B}\toD^{(*)}\ell^-\bar\nu$. Our result for the angular distribution is at variancewith some of the results on scalar-vector interference terms in the literature.We provide numerical estimates for all angular observables based on lattice-QCDresults for the $\Lambda_b \to \Lambda_c$ form factors and account for a recentmeasurement of the parity-violating parameter in $\Lambda_c^+\to\Lambda^0\pi^+$ decays by BESIII. A numerical implementation of our results ismade publicly available as part of the EOS software.

Angular Analysis of \boldmath $\Lambda_b\to \Lambda_c (\to \Lambda \pi)\ell\bar\nu$