The B*Bpi Coupling in the Static Limit

Abstract

We study an accurate method for the lattice calculation of the B*Bpi Coupling in the static limit, paying particular attention to excited state contamination. As this coupling is a parameter of the heavy meson chiral Lagrangian, it is useful for constraining the chiral behaviour of various observables in B-physics. We present a precise study of the continuum limit in the quenched approximation and preliminary results with 2 flavours of improved Wilson quarks (using CLS lattices) for pion masses down to around 250 MeV. With dynamical quarks both the lattice spacing and the light quark mass dependences are found to be very weak. We can quote g = 0.51(2) for the continuum value in the chiral limit, where the error will be reduced when a more complete analysis has been performed.

7 pages, 3 figures. Talk given at the XXVIII International Symposium on Lattice Field Theory (Lattice 2010), Villasimius, Italy, June 2010

Cited by in corpus (7)

• Nucleon Structure from Lattice QCD Using a Nearly Physical Pion Mass
• On the computation of hadron-to-hadron transition matrix elements in lattice QCD
• Precision lattice QCD computation of the $B^{\ast }B\pi$ coupling
• The b-quark mass from non-perturbative $N_f=2$ Heavy Quark Effective Theory at $O(1/m_h)$
• Spatial distributions in static heavy-light mesons: a comparison of quark models with lattice QCD
• Pionic couplings to the lowest heavy-light mesons of positive and negative parity
• On the $B^{{\ast }^{\prime }}\to B$ transition