Using the clover fermion action in unquenched QCD with pion masses as low as 420 MeV, we look for evidence for chiral logs in the static-light decay constant. There is some evidence for a chiral log term, if the original static theory of Eichten and Hill is used. However, the more precise data from the static action of the ALPHA collaboration do not show any evidence for non-linear dependence o...

The strong coupling constants gΣQΛQπ (Q = b and c) are studied in the framework of the light cone QCD sum rules using the most general form of the baryonic currents. The predicted coupling constants are used to estimate the decay widths for the ΣQ −→ ΛQπ decays which are compared with the predictions of the other approaches and existing experimental data. PACS: 11.55.Hx, 13.30.-a, 14.20.Lq, 14....

Non-relativistic QCD is applied for a lattice computation of the heavy-light meson decay constant in quenched approximation at β = 6.0. Clear signals are obtained for the ground state at large times in the correlators, allowing a reliable extraction of the decay constant. Estimating the current renormalization factor by the tadpole improvement procedure, we find fB = 164(17) MeV for the B meson...

We compute the leptonic decay constant of heavy-light vector mesons in the quenched approximation. The reliability of lattice computations for heavy quarks is checked by comparing the ratio of the vector to the pseudoscalar decay constant with the prediction of Heavy Quark EEective Theory in the