Determinations of vertical stroke V_cb vertical stroke and vertical stroke V_ub vertical stroke from baryonic Λ_b decays

We present the first attempt to extract vertical stroke V_cb vertical stroke from the Λ_b → Λ_c⁺l anti ν_l decay without relying on vertical stroke V_ub vertical stroke inputs from the B meson decays. Meanwhile, the hadronic Λ_b → Λ_cM_(c) decays with M = (π^-,K^-) and M_c =(D^-,D^-_s) measured with high precisions are involved in the extraction. Explicitly, we find that vertical stroke V_cb vertical stroke =(44.6 ± 3.2) x 10^-3, agreeing with the value of (42.11 ± 0.74) x 10^-3 from the inclusive B → X_cl anti ν_l decays. Furthermore, based on the most recent ratio of vertical stroke V_ub vertical stroke / vertical stroke V_cb vertical stroke from the exclusive modes, we obtain vertical stroke V_ub vertical stroke = (4.3 ± 0.4) x 10^-3, which is close to the value of (4.49 ± 0.24) x 10^-3 from the inclusive B → X_ul anti ν_l decays. We conclude that our determinations of vertical stroke V_cb vertical stroke and vertical stroke V_ub vertical stroke favor the corresponding inclusive extractions in the B decays. (orig.)