We investigate the pure annihilation type radiative B meson decays B 0 → ? γ and B s → ρ 0 ( ω ) γ in the soft-collinear effective theory. We consider three types of contributions to the decay amplitudes, including the direct annihilation topology, the contribution from the electromagnetic penguin operator, and the contribution of the neutral vector meson mixing. The numerical analysis shows that the decay amplitudes are dominated by the ω ? ? mixing effect in the B 0 → ? γ and B s → ω γ modes. The corresponding decay branching ratios are enhanced about 3 orders of magnitude relative to the pure annihilation type contribution in these two decay channels. The decay rate of B s → ρ 0 γ is much smaller than that of B s → ω γ because of the smaller ρ 0 ? ? mixing. The predicted branching ratios ? B ( B 0 → ? γ ) ? = ( 3.9 6 ? 1.45 + 1.67 ) × 10 ? 9 and ? B ( B s → ω γ ) ? = ( 1.9 9 ? 0.70 + 0.81 ) × 10 ? 7 are to be tested by the Belle-II and LHCb experiments.
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机译：错误到：<重点类型=“斜体”> B <重点类型=“斜体”> c + < /堆栈>衰减到<重点类型=“斜体”> k <重点类型=“italic”> k ？ <强调 键入=“斜体”>π + 最终状态通过使用 b s 0 ，χ <重点类型=“斜体”> c 0 和<重点类型=“斜体”> d 0 谐振和弱湮灭非人拓扑拓
