Abstract
We have computed the chiral logarithmic corrections to the heavy meson mixing amplitudes in the Standard Model and beyond. The impact of the inclusion of lowest-lying scalar heavy-light states to the decay constants and bag-parameters has been investigated and shown that this does not modify the pion chiral logarithms, but it does produce corrections which are competitive in size with the K- and eta-meson chiral logarithms. The result is highly relevant for the precise determination of the heavy meson bag-parameters from lattice studies since the pion chiral logarithms represent the most important effect in guiding the chiral extrapolations of the lattice data for these quantities.
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