On the significance of B-decays to radially excited D

Damir Becirevic (1) , Benoit Blossier (1) , Antoine Gerardin (1) , Alain Le Yaouanc (1) , Francesco Sanfilippo (1)

1 LPT - Laboratoire de Physique Théorique d'Orsay [Orsay]

We point out that the recent claims of a relatively large value of the B --> D' transition form factor could be tested in experiments through B0--> D' pi+ and B- --> D' 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 Nf=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.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Réseau [hep-lat]; Physique des Hautes Energies - Phénoménologie [hep-ph]

Damir Becirevic, Benoit Blossier, Antoine Gerardin, Alain Le Yaouanc, Francesco Sanfilippo. On the significance of B-decays to radially excited D. Nuclear Physics B, 2013, 872, pp.313-332. ⟨10.1016/j.nuclphysb.2013.04.008⟩. ⟨hal-00783601⟩