Annihilation, Rescattering, andCPAsymmetries inBMeson Decays

A number of $B$ meson decays may proceed only through participation of the spectator quark, whether through amplitudes proportional to $f_B{/m}_B$ or via rescattering from other less-suppressed amplitudes. An expected hierarchy of amplitudes in the absence of rescattering will be violated by rescattering corrections. Such violations could point the way toward channels in which final-state interactions could be important. Cases in which final state-phases can lead to large $\mathrm{CP}$ asymmetries are pointed out.