Implications of new data in charmless B decays

Based on the latest experimental data of B ->pi pi and pi K modes, a model-independent analytical analysis is presented. The CP-averaged branching ratio difference Delta R=R-c-R-n in B ->pi K decays with R-c=2Br(pi K-0(-))/Br(pi(-)(K) over bar (0)) and R-n=Br(pi K-+(-))/2Br(pi(0)(K) over bar (0)) is reduced though it remains larger than the prediction from the standard model (SM) as both measured R-n and R-c are enhanced, which indicates that a room for new physics becomes smaller. The present data of pi pi decay reduce the ratio vertical bar C/T vertical bar from the previous value of vertical bar C/T vertical bar similar or equal to 0.8 to vertical bar C/T vertical bar similar or equal to 0.65, which is still larger than the theoretical estimations based on QCD factorization and pQCD. Within SM and flavor SU(3) symmetry, the current pi K data also diminish the ratio vertical bar C/T-'vertical bar from the previous value vertical bar C'/T'vertical bar similar or equal to 2 to vertical bar C'/T'vertical bar similar or equal to 1.16 with a large strong phase delta(C)'similar or equal to-2.65, while its value remains much larger than the one extracted from the pi pi modes. The direct CP violation A(CP)(pi(0)(K) over bar (0)) is predicted to be A(CP)(pi(0)(K) over bar (0))=-0.15 +/- 0.03, which is consistent with the present data. Two kinds of new effects in both strong and weak phases of the electroweak penguin diagram are considered. It is found that both cases can reduce the ratio to vertical bar C'/T'vertical bar=0.40 similar to 0.80 and lead to roughly the same predictions for CP violation in pi K-0(0).