Can contributions to B_s→l~+l~-γ from the magnetic-penguin operator with real photons in the standard model be neglected? |
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作者姓名: | 王雯宇 熊兆华 周四红 |
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作者单位: | Institute of Theoretical Physics, Beijing University of Technology, Beijing 100124, China |
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基金项目: | Supported by National Natural Science Foundation of China(11005006,11172008);Ri Xin Foundation of BJUT |
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摘 要: | Using the Bs meson wave function extracted from non-leptonic Bs decays, we reevaluate the rare decays Bs→l+l- γ,(l=e,μ) in the Standard Model, including two kinds of contributions from the magnetic-penguin operator with virtual and real photons. We find that contributions to the exclusive decays from the magnetic-penguin operator b→sγ with real photons, which were regarded as negligible in the previous literature, are large and the branching ratios Bs→l+l-γ are enhanced by a factor of almost 2. With the predicted branching ratios of the order of 10-8, it is expected that these radiative dileptonic decays will be detected in LHC-b and B factories in the near future.
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关 键 词: | Bs→l+l-γ magnetic-penguin operator real photons |
收稿时间: | 2013-07-17 |
修稿时间: | 2013-12-07 |
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