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arXiv 0811.1458hep-ph
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μ-τ反射对称中低能观测量与轻子生成的桥

Bridges of Low Energy observables with Leptogenesis in mu-tau Reflection Symmetry

Y. H. Ahn, Sin Kyu Kang, C. S. Kim, T. Phong Nguyen

摘要:

我们考虑了在有和没有超对称性的跷跷板模型的背景下,在大统一尺度上实现的中微子扇区中的精确的μ-τ反射对称性。假设两个较轻的重Majorana中微子在GUT标度下是简并的,结果表明,重整化群(RG)从GUT标度演化到跷跷板标度导致了μ-τ对称性的破缺和两个简并重Majorana中微子质量之间的微小分裂以及Y_nu中CP相的微小变化,这些都是实现轻子生成的必要条件.由于mu-tau反射对称性,这种小的RG效应导致theta_{23}与最大值的微小偏差以及CP相位delta_{CP}与在GUT尺度下施加的pi/2的微小偏差。在我们的方案中,所需量的重子不对称性eta_B可以通过所谓的共振电子轻子生成来产生,其中与电子味有关的洗脱因子在再现成功的轻子生成中起着至关重要的作用。我们证明了导致宇宙重子不对称性产生的CP破坏可以直接与中微子振荡以及中微子混合角theta_{12}和theta_{13}测量的CP破坏联系起来。我们希望,除了反应堆和长基线中微子实验,测量超对称参数tan{beta}在未来的对撞机实验将作为一个间接的测试,我们的方案的重子生成的基础上的μ-τ反射对称性。

英文摘要:

We consider an exact mu-tau reflection symmetry in neutrino sectorrealized at the GUT scale in the context of the seesaw model with and without supersymmetry. Assuming the two lighter heavy Majorana neutrinos are degenerate at the GUT scale, it is shown that the renormalization group (RG) evolution from the GUT scale to the seesaw scale gives rise to breaking of the mu-tau symmetry and a tiny splitting between two degenerate heavy Majorana neutrino masses as well as small variations of the CP phases in Y_nu, which are essential to achieve a successful leptogenesis. Such small RG effects lead to tiny deviations of theta_{23} from the maximal value and the CP phase delta_{CP} from pi/2 imposed at the GUT scale due to mu-tau reflection symmetry. In our scenario, the required amount of the baryon asymmetry eta_B can be generated via so-called resonant e-leptogenesis, in which the wash-out factor concerned with electron flavor plays a crucial role in reproducing a successful leptogenesis. We show that CP violation responsible for the generation of baryon asymmetry of our universe can be directly linked with CP violation measurable through neutrino oscillation as well as neutrino mixing angles theta_{12} and theta_{13}. We expect that, in addition to the reactor and long baseline neutrino experiments, the measurements for the supersymmetric parameter tan{beta} at future collider experiments would serve as an indirect test of our scenario of baryogenesis based on the mu-tau reflection symmetry.

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