We present first lattice QCD results for semileptonic form factors for the
decays Bc​→ηc​lν and Bc​→J/ψlν over the full q2
range, using both improved non-relativistic QCD (NRQCD) and fully relativistic
(HISQ) formalisms. These can be viewed as prototype calculations for
pseudoscalar to pseudoscalar and pseudoscalar to vector decays involving a b→c transition. In particular we can use information from the relativistic
computations to fix the NRQCD current normalisations, which can then be used in
improved computations of decays such as B→Dlν and B→D∗lν.Comment: 3 pages, 3 figures. Poster presented at the 16th International
Conference on B-Physics at Frontier Machines, 2-6 May 2016, Marseille, Franc