The ratio method, tuned with twisted boundary conditions, extracts a psi(3770) -> D D mixing amplitude from two N_f=2 ensembles and gives Gamma = 24.2(6.4) MeV, but with unquantified systematic errors.
Hadronic decay of a scalar B meson from the lattice
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abstract
We explore the transitions B$(0^+)$ to B $\pi$ and B$_s(0^+)$ to B K from lattice QCD with $N_f=2$ flavours of sea quark, using the static approximation for the heavy quark. We evaluate the effective coupling constants, predicting a B$(0^+)$ to B $\pi$ width of around 160 MeV. Our result for the coupling strength adds to the evidence that the B$_s(0^+)$ meson is not predominantly a molecular state (BK).
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Hadronic decay of vector charmonium from the lattice
The ratio method, tuned with twisted boundary conditions, extracts a psi(3770) -> D D mixing amplitude from two N_f=2 ensembles and gives Gamma = 24.2(6.4) MeV, but with unquantified systematic errors.