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arXiv 1406.7837hep-ph
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双线性R宇称破坏中的CP破坏及其对早期宇宙的影响

CP violation in bilinear R-parity violation and its consequences for the early universe

Asma Cheriguene, Stefan Liebler, Werner Porod

摘要:

双线性R宇称破坏的超对称模型为解释中微子振荡数据提供了中微子质量和混合角的框架。我们考虑了BRpV中新物理相中的CP破坏,并讨论了它们对中微子质量的产生和质量为$\sim 100$ GeV的次领先级轻中微子超对称粒子(LSP)衰变的影响.衰变影响轻子,并通过sphaleron跃迁影响早期宇宙中的重子不对称性。对于相当轻的LSP,在电弱相变之前经由例如Affleck-Dine机制产生的不对称性被减小高达两个数量级,但仍然存在。另一方面,光LSP本身的衰变可以解释轻子和重子不对称性的产生,后者与我们宇宙中的观测一致,因为BRpV参数的小允许平衡衰变,并且足够大的CP破坏可能与未观测到电偶极矩的实验边界一致。

英文摘要:

Supersymmetric models with bilinear R-parity violation (BRpV) provide a framework for neutrino masses and mixing angles to explain neutrino oscillation data. We consider CP violation within the new physical phases in BRpV and discuss their effect on the generation of neutrino masses and the decays of the lightest supersymmetric particle (LSP), being a light neutralino with mass $\sim 100$ GeV, at next-to-leading order. The decays affect the lepton and via sphaleron transitions the baryon asymmetry in the early universe. For a rather light LSP, asymmetries generated before the electroweak phase transition via e.g. the Affleck-Dine mechanism are reduced up to two orders of magnitude, but are still present. On the other hand, the decays of a light LSP themselves can account for the generation of a lepton and baryon asymmetry, the latter in accordance to the observation in our universe, since the smallness of the BRpV parameters allows for an out-of-equilibrium decay and sufficiently large CP violation is possible consistent with experimental bounds from the non-observation of electric dipole-moments.

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