0 B → φK and B → φX s in the Heavy Quark Limit Xiao -

We study B → φK and B → φXs decays in the heavy quark limit using perturbative QCD. The next leading order corrections introduce substantial modifications to the naive factorization results (more than 50%). The branching ratio Br(B → φK) is predicted to be in the range (FB→K 1 (mφ)/0.33)(3.8 ∼ 4.0)× 10−6 which is within the one σ allowed region from the central value of 6.2×10−6 measured by CLEO, but outside the one σ allowed region from the central value of 17.2 × 10−6 measured by BELLE for reasonable FB→K 1 . For the semi-inclusive decay B → φXs we also include initial bound state effect in the heavy quark limit which decreases the branching ratio by about 10%. Br(B → φXs) is predicted to be in the range (5.3 ∼ 6.0)× 10−5. Typeset using REVTEX