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Semileptonic BcB_c decays from full lattice QCD

Abstract

We present first lattice QCD results for semileptonic form factors for the decays Bc→ηclνB_c \to \eta_c l \nu and Bc→J/ψlνB_c \to J/\psi l \nu over the full q2q^2 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→cb \to 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→DlνB \to D l \nu and B→D∗lνB \to D^* l \nu.Comment: 3 pages, 3 figures. Poster presented at the 16th International Conference on B-Physics at Frontier Machines, 2-6 May 2016, Marseille, Franc

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