Chen, JX (reprint author), CAS, Inst High Energy Phys, Beijing 100049, Peoples R China.
The three-body decay B-0(B-s) -> gamma v (v) over bar can occur via penguin and box diagrams in the Standard Model (SM). These channels are useful to determine the decay constant f(B) (fB(s)) and B (B-s) meson wave function. Using the B meson wave function determined in hadronic B (B-s) decays, we calculate and get the branching ratio of order 10(-9) and 10(-8) for B-0 and B-s decay, respectively. They agree with previous calculations.