INCLUSIVE PHOTON ENERGY-SPECTRUM IN RARE B DECAYS

Inclusive photon energy spectrum and decay rate for the rare radiative decays of the B hadrons, B --> gamma + X(s) (here X(s) denotes hadrons with total strangeness quantum number S = -1), are calculated in the standard theory of electroweak interactions, using the b quark decay model. The calculations have been done in the framework of an effective low-energy Lagrangian based on the gauge invariant operators of dimension 6. The large QCD effects, contained in the Wilson coefficients of these operators, are included in our approach. The shape of the photon energy spectrum and the branching ratio BR(B --> gamma + X(s)) are sensitive to the top quark mass.