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Lepton flavor universality can be tested in the semileptonic decays$\Lambda_b\to \Lambda_c^{(\ast)}$ where $\Lambda_c^{(\ast)}$ denotes either theground state $\Lambda_c(2286)$ (with $J^P=1/2^+$) or its orbital excitations$\Lambda_c(2595)$ (with $J^P=1/2^-$) and $\Lambda_c(2625)$ (with $J^P=3/2^-$).We calculate the differential decay rates as well as the branching fractions ofthese decays for both tauonic and muonic modes with form factors obtained froma covariant confined quark model previously developed by us. We present resultsfor the rate ratios of the tauonic and muonic modes which provide importanttests of lepton flavor universality in forthcoming experiments.

Analyzing lepton flavor universality in the decays $\Lambda_b\to\Lambda_c^{(\ast)}(\frac12^\pm,\frac32^-) + \ell\,\bar\nu_\ell$