Low Energy Aspects of Heavy Meson Decays

I discuss low energy aspects of heavy meson decays, where there is at least one heavy meson in the final state. Examples are $B-\bar{B}$ mixing, $B \to D \bar{D}$,$B \to D \eta’$,and$B \to D \gamma$\mathrm{.}$B \to D W $ (Isgur-Wise function). The analysis is performed in the heavy quark limit within heavy-light chiral perturbation theory. Coefficients of $1\mathrm{/}{N}_c$ suppressed chiral Lagrangian terms (beyond factorization) have been estimated by means of a heavy-light chiral quark model.