Power corrections seem to play an important role in charmless B decays as
indicated by recent analysis using QCD Factorization. In this talk, I would
like to report on a recent work on power corrections in charmless B decays. By
using the ratio of the branching fraction of B+→π+K∗0 to that
of B0→π−ρ+, for which the theoretical uncertainties are greatly
reduced, it is shown in a transparent manner that power corrections in
charmless B decays are probably large and that the B0→K−ρ+ decay
could be explained with the annihilation term included. For ratios of direct CP
asymmetries, QCD Factorisation with the annihilation terms included would
predict the direct CP asymmetry of B→π+π− to be about 3 times
larger than that of B→π±K∓, with opposite sign. In particular,
the large measured value for B→π±K∓ CP asymmetry implies
naturally a corresponding large B→π+π− CP asymmetry as observed by
Belle. Experimentally any significant deviation from this prediction or
possibly the importance of long-distance rescattering effects.Comment: Talk given at the QCD Euroconference 2004, Montpellier 5-9 July
2004., LateX, 7 pages, 2 figure