HADRONIC RARE B-DECAYS - THE CASE B-]SGG

We calculate the processes b → sgg, b → sgγ and b → sγγ to one loop. The absence of large logarithmic form factors is confirmed, but momentum-dependent contributions from intermediate charm quarks are found to be sizeable. We obtain BR(b → sgg) ≈ 10-3 (symmetric and antisymmetric color configuration); BR(b → sgγ) ≈ 2 × 10-5 and BR(b → sγγ) ≈ 2 × 10-7. As an application, the rate B → K + glueball is estimated. We give a detailed discussion of the various form factors and of the effective lagrangian, and show that the absence of logarithms persists for any number of gluons and photons. © 1990.