Regular Article - Theoretical Physics
D ∗→Dπ and D ∗→Dγ decays: axial coupling and magnetic moment of D ∗ meson
Laboratoire de Physique Théorique (Bât. 210), Université Paris Sud, Centre d’Orsay, 91405, Orsay-Cedex, France
* e-mail: Damir.Becirevic@th.u-psud.fr
Published online: 31 August 2011
The axial coupling and the magnetic moment of D ∗-meson or, more specifically, the couplings and , encode the non-perturbative QCD effects describing the decays D ∗→Dπ and D ∗→Dγ. We compute these quantities by means of lattice QCD with N f=2 dynamical quarks, by employing the Wilson (“clover”) action. On our finer lattice (a≈0.065 fm) we obtain , and . This is the first determination of on the lattice. We also provide a short phenomenological discussion and the comparison of our result with experiment and with the results quoted in the literature.
© Springer-Verlag / Società Italiana di Fisica, 2011