Contributions of the B→B'γ process to the B→B'πγ decays

The bremsstrahlung calculations for the B→B'πγ decays cannot be considered to be adequate especially when we have high-momentum photons and when the processes which are related to the ΔS = 1 B→B'γ decays followed (or preceded) by the strong emission of a pion become important. The contributions to the rate of the B→B'πγ decays from these processes are calculated as well as the expressions for the πγ angular distribution due to this mechanism as well as due to bremsstrahlung. (author)