g(B*Bpi)-coupling in the static heavy quark limit

Damir Becirevic (1) , Benoit Blossier (1) , Emmanuel Chang (1) , Benjamin Haas (1)

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

By means of QCD simulations on the lattice, we compute the coupling of the heavy-light mesons to a soft pion in the static heavy quark limit. The gauge field configurations used in this calculations include the effect of N_f=2 dynamical Wilson quarks, while for the static quark propagator we use its improved form (so called HYP). On the basis of our results we obtain that the coupling g=0.44 +/- 0.03 (+0.07/-0.00), where the second error is flat (not gaussian).

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

Damir Becirevic, Benoit Blossier, Emmanuel Chang, Benjamin Haas. g(B*Bpi)-coupling in the static heavy quark limit. Physics Letters B, 2009, 679, pp.231-236. ⟨10.1016/j.physletb.2009.07.031⟩. ⟨hal-00391041⟩