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arXiv 2101.01344hep-ph
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纯湮灭型B到V γ衰变的研究

Study on pure annihilation type B to V gamma decays

Hui Deng, Jing Gao, Lei-Yi Li, Cai-Dian Lü, Yue-Long Shen, Chun-Xu Yu

备注：
radiative decay, annihilation topology, vector meson mixing
发表信息：
Phys. Rev. D 103, 076004 (2021)
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摘要：

在软共线有效理论下研究了纯湮灭型辐射$B$介子衰变$B^0 \to ϕγ$和$B_s \to ρ^0(ω)γ$.我们考虑了三种类型对衰变振幅的贡献，包括直接湮没拓扑、电磁企鹅算符的贡献和中性矢量介子混合的贡献。数值分析表明，在$B^0 \to ϕγ$和$B_s \to ωγ$模中，$ω-ϕ$的混合效应对衰减幅度起主导作用.相应的衰变分支比相对于这两个衰变通道中的纯湮灭型贡献提高了约三个数量级。由于$ρ^0-ϕ$混合较小，因此$B_s \to ρ^0γ$的衰减速率远小于$B_s \to ωγ$。预测的分支比$B(B^{0}\rightarrowϕγ)=(3.99^{+1.67}_{-1.46} )\times10^{-9},\,B(B_s\rightarrowωγ)=(2.01^{+0.81}_{-0.71} )\times10^{-7}$将通过Belle-II和LHC-b实验进行测试。

英文摘要：

We investigate the pure annihilation type radiative $B$ meson decays $B^0 \to ϕγ$ and $B_s \to ρ^0(ω)γ$ 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 electro-magnetic penguin operator and the contribution of the neutral vector meson mixings. The numerical analysis shows that the decay amplitudes are dominated by the $ω-ϕ$ mixing effect in the $B^0 \to ϕγ$ and $B_s \to ωγ$ modes. The corresponding decay branching ratios are enhanced about three orders of magnitudes relative to the pure annihilation type contribution in these two decay channels. The decay rate of $B_s \to ρ^0γ$ is much smaller than that of $B_s \to ωγ$ because of the smaller $ρ^0-ϕ$ mixing. The predicted branching ratios $B(B^{0}\rightarrowϕγ)=(3.99^{+1.67}_{-1.46} )\times10^{-9},\,B(B_s\rightarrowωγ)=(2.01^{+0.81}_{-0.71} )\times10^{-7}$ are to be tested by the Belle-II and LHC-b experiments.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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