A leading-order pQCD calculation of all six Lambda_b to Lambda_c form factors, z-expanded and anchored to a lattice QCD point, predicts R_Lambda_c = 0.29+0.12-0.11, slightly above LHCb.
Over the full q2 range accessible in the τ mode, Cτ F remains small, indicating that the cos θℓ distribution is nearly linear
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Investigation of $\Lambda_{b}\to \Lambda_{c} \ell^-\overline\nu_\ell$ Decays in Perturbative QCD Approach
A leading-order pQCD calculation of all six Lambda_b to Lambda_c form factors, z-expanded and anchored to a lattice QCD point, predicts R_Lambda_c = 0.29+0.12-0.11, slightly above LHCb.