On the significance of B-decays to the radially excited D

We discuss the possibilities of testing the recent claims of a relatively large B -> D' transition form factor through the non-leptonic (B) over bar (0) -> D'(+)pi(-) and B- -> D'(0)pi(-) decay modes. To estimate the width of the latter we need the decay constant of the radially excited D-meson that we computed in lattice QCD with N-f = 2 dynamical flavors and after taking the continuum limit we found f(D') = 117(25) MeV. We also provide an update for the values of the D-meson decay constants obtained by using maximally twisted mass QCD. (C) 2013 Elsevier B.V. All rights reserved.