Abstract

We compute the B ∗ Bπ coupling ˆ∞ for the static heavy-light meson using all-to-all propagators. It is shown that low-mode averaging with 100 low-lying eigenmodes indeed significantly improves the signal for the 2-point and 3-point functions for heavy-light meson. Our study suggests that the all-to-all propagator is a very efficient method for the high precision computation of the B ∗ Bπ coupling, especially in unquenched QCD, where the number of configurations is limited.

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