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首页> 外文期刊>Journal of Experimental and Theoretical Physics >μ → eγ decay versus the μ → eee bound and lepton flavor violating processes in supernova
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μ → eγ decay versus the μ → eee bound and lepton flavor violating processes in supernova

机译：μ→eγ衰减与超新星中的μ→eee结合和轻子风味违反过程

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Even tiny lepton flavor violation (LFV) due to some New Physics is able to alter the conditions inside a collapsing supernova core and probably to facilitate the explosion. LFV emerges naturally in a see saw type - II model of neutrino mass generation. Experimentally, the LFV beyond the Standard Model is constrained by rare lepton decay searches. In particular, strong bounds are imposed on the μ →eee branching ratio and on the μ-e conversion in muonic gold. Currently, the μ →eγ is under investigation in the MEG experiment that aims at a dramatic increase in sensitivity in the next three years. We seek a see-saw type-II LFV pattern that fits all the experimental constraints, leads to Br(μ → eγ) ?Br(μ → eee), and ensures a rate of LFV processes in supernova high enough to modify the supernova physics. These requirements are sufficient to eliminate almost all freedom in the model. In particular, they lead to the prediction 0.4 × 10 ~(-12) ? Br(μ → eγ) ? 6 × 10 ~(-12), which will be testable by MEG in the nearest future. The considered scenario also constrains the neutrino mass mixing pattern and provides lower and upper bounds on τ-lepton LFV decays. We also briefly discuss a model with a single bilepton in which the μ → eee decay is absent at the tree level.
机译：即使是由于某些新物理学引起的微小的轻子风味破坏（LFV），也能够改变坍缩的超新星核内部的条件，并可能促进爆炸。 LFV自然地出现在中微子质量产生的II型跷跷板模型中。实验上，超出标准模型的LFV受罕见的轻子衰变搜索的约束。特别地，对μ→eee的支化比和μ-e的金离子转化率施加了严格的界限。目前，在MEG实验中正在研究μ→eγ，该实验旨在在未来三年内显着提高灵敏度。我们寻求一种适合所有实验约束的跷跷板II型LFV模式，从而导致Br（μ→eγ）？Br（μ→eee），并确保超新星中的LFV过程速率足够高，以改变超新星物理学。这些要求足以消除模型中几乎所有的自由。特别是，它们导致预测为0.4×10〜（-12）？ Br（μ→eγ）？ 6×10〜（-12），MEG将在不久的将来对其进行测试。所考虑的场景还约束了中微子质量混合模式，并为τ轻子LFV衰减提供了上限和下限。我们还简要地讨论了一个带有单个比对的模型，其中在树级没有μ→eee衰减。

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