We present a first Nf=2 lattice estimate of the hadronic coupling g_12 which parametrises the strong decay of a radially excited B* meson into the ground state B meson at zero recoil. We work in the static limit of Heavy Quark Effective Theory (HQET) and solve a Generalised Eigenvalue Problem (GEVP), which is necessary for the extraction of excited state properties. After an extrapolation to the continuum limit and a check of the pion mass dependence, we obtain g_12 = -0.17(4).
@article{arxiv.1304.3363,
title = {On the B*' --> B transition},
author = {Benoît Blossier and John Bulava and Michael Donnellan and Antoine Gérardin},
journal= {arXiv preprint arXiv:1304.3363},
year = {2013}
}