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arXiv 1012.1834hep-phgr-qc
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轻子味破坏与极小共振轻子生成中的θ(13)

Lepton Flavour Violation and theta(13) in Minimal Resonant Leptogenesis

Frank F. Deppisch, Apostolos Pilaftsis

摘要:

我们研究了共振轻子生成的最小非超对称模型对带电轻子味破坏和中微子混合角θ的影响。共振τ-,μ-和e-轻子生成的可能的低尺度味实现提供了非常独特和预测的框架,以解释观察到的重子不对称性在宇宙中的单个τ-,μ-和e-轻子数不对称性的sphaleron转换得到共振增强通过近简并重马约拉纳中微子的平衡衰变。基于近似味对称性,我们构建了可行的方案,共振τ,μ和e-leptogenesis兼容的通用右手中微子质量在大统一体尺度,所需的重中微子质量分裂产生辐射。在这种情况下,重的马约拉纳中微子可以轻至100 GeV,它们与两个带电轻子的耦合可能很大。特别是,我们明确地证明了令人信服的作用,三个重马约拉纳中微子发挥,以获得成功的leptogenesis和实验可测率轻子味违反过程,如μ--> e γ和μ--> e转换的核。

英文摘要:

We study the impact of minimal non-supersymmetric models of resonant leptogenesis on charged lepton flavour violation and the neutrino mixing angle theta(13). Possible low-scale flavour realisations of resonant tau-, mu- and e-leptogenesis provide very distinct and predictive frameworks to explain the observed baryon asymmetry in the Universe by sphaleron conversion of an individual tau-, mu- and e-lepton-number asymmetry which gets resonantly enhanced via out-of-equilibrium decays of nearly degenerate heavy Majorana neutrinos. Based on approximate flavour symmetries, we construct viable scenarios of resonant tau-, mu- and e-leptogenesis compatible with universal right-handed neutrino masses at the GUT scale, where the required heavy-neutrino mass splittings are generated radiatively. The heavy Majorana neutrinos in such scenarios can be as light as 100 GeV and their couplings to two of the charged leptons may be large. In particular, we explicitly demonstrate the compelling role that the three heavy Majorana neutrinos play, in order to obtain successful leptogenesis and experimentally testable rates for lepton flavour violating processes, such as mu --> e gamma and mu --> e conversion in nuclei.

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