Searching for new physics in D^0→μ^+ μ^-,e^+e^-,μ^±e at BES and/or the super charm-tau factory |
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作者姓名: | 贾连宝, 赵明刚, 柯红卫, 李学潜 |
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作者单位: | [1]School of Physics, Nankai University, Tianjin 300071, China; [2]School of Physics, Tianjin University, Tianjin 300072, China |
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基金项目: | Supported by National Natural Science Foundation of China (11375128) |
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摘 要: | In contrast with B0-ˉB0, Bs-ˉBs mixing where the standard model(SM) contributions overwhelm that of the new physics beyond standard model(BSM), a measured relatively large D0-ˉD0mixing where the SM contribution is negligible, definitely implies the existence of the new physics BSM. It is natural to consider that the rare decays of D meson might be more sensitive to new physics, and the decay mode D0→μ+μ-could be an ideal area to search for new physics because it is a flavor changing process. In this work we look for a trace of the new physics BSM in the leptonic decays of D0. Concretely we discuss the contributions of unparticle or an extra gauge boson Z while imposing the constraints set by fitting the D0-ˉD0mixing data. We find that the long-distance SM effects for D0→lˉl still exceed those contributions of the BSM under consideration, but for a double-flavor changing process such as D0→μ±e, the new physics contribution would be significant.
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关 键 词: | 物理学会 tau蛋白 搜索 BES 标准模型 轻子衰变 BSM 规范玻色子 |
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