Du, DS (reprint author), CAS, Inst High Energy Phys, Beijing 100039, Peoples R China.
The problem of chirally enhanced corrections for B decays into two light pseudoscalars in QCD factorization scheme is discussed. We find that the infrared divergences of the vertex corrections cancel only if the twist-3 Wave functions are symmetric. In that case chirally enhanced corrections can be included consistently. The divergences appeared in the hard spectator scattering are also discussed briefly.