Du, DS (reprint author), CCAST, World Lab, POB 8730, Beijing 100080, Peoples R China.
We study the final-state interactions in B --> pi K decays through B --> VV --> pi K processes where the inelastic rescattering occurs via single pion exchange. The next-to-leading order low-energy effective Hamiltonian and Bauer-Stech-Wirbel (BSW) model are used to evaluate the weak transition matrix elements and final-state interactions. We found that the final-state interaction effects in B --> rho K* --> pi K processes are significant. The Fleischer-Mannel relation for the Cabibbo-Kobayashi-Maskawa (CKM) angle gamma can be significantly modified.