RADIATIVE B-]K-ASTERISK-GAMMA TRANSITION IN QCD

We evaluate the branching ratios of the radiative decays B --> Kgamma , and B --> K1gamma in the framework of three-point function QCD sum r ules. We find: GAMMA(B --> Ky)/GAMMA(b --> sgamma) = 0.17 +/- 0.05 an d GAMMA(B --> K1gamma)/GAMMA(b --> sgamma) = 0.30 +/- 0.15. We also st udy, in the infinite quark mass limit, the connection between the form factor of the radiative B --> Kgamma transition and the weak hadroni c form factors entering the semileptonic B-meson decays.