Penguin-Induced Radiative Baryonic B Decays

Weak radiative baryonic B decays B → B1B2γ mediated by the electromagnetic penguin process b → sγ have appreciable rates larger than their two-body counterparts B → B1B2. The branching ratios for B → Λp̄γ and B → Ξ0Σ̄−γ are sizable, falling into the range of (1 ∼ 6) × 10−6 with the value preferred to be on the large side, and not far from the bottom baryon radiative decays Λb → Λγ and Ξb → Ξγ due to the large short-distance enhancement for b → sγ penguin transition and the large strong coupling of the anti-triplet bottom baryons with the B meson and the light baryon. These penguin-induced radiative baryonic B decay modes should be accessible by B factories.