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arXiv 1104.2654hep-phhep-ex
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中微子跷跷板、重子不对称性和隐味对称性中μ-τ和CP破缺的共同起源

Common Origin of mu-tau and CP Breaking in Neutrino Seesaw, Baryon Asymmetry, and Hidden Flavor Symmetry

Hong-Jian He, Fu-Rong Yin

摘要:

我们推测,所有的CP破坏(狄拉克和马约拉纳类型)产生于一个共同的起源中微子跷跷板。通过这个概念上有吸引力的和简单的猜想,我们推导出,mu-tau打破共享共同的起源与所有的CP破坏。我们研究了在跷跷板拉格朗日量的狄拉克质量矩阵中的μ-τ和CP破缺的共同起源(右手中微子是μ-τ盲的),它唯一地导致了轻中微子的反质量序.然后,我们预测了两个小的μ-tau破坏观测值theta_{13}-0和theta_{23}-45之间的非常不同的相关性,这可以饱和theta_{13}的实验上限。这将被测试对我们以前的正常的质量排序计划正在进行的振荡实验。我们还分析了theta_{13}与Jarlskog不变量和可观测到的无中微子双β衰变的相关性。从中微子跷跷板中CP和μ-τ破缺的共同起源出发,建立了低能CP破坏与重子不对称性的宇宙学CP破坏之间的直接联系.利用这些结果,我们进一步预测了theta_{13}的一个下界,支持了大亚湾theta_{13}、Double Brachz和RENO实验的正在进行的探测。最后,我们分析了轻中微子扇区的Z_2 × Z_2对称结构,并将其映射到跷跷板扇区,其中一个Z_2对应于μ-τ对称,另一个对应于隐含对称Z_2^s(在我们以前的工作中揭示),它决定了太阳混合角θ_{12}。我们导出了在有μ-τ破缺的情况下(有或没有中微子跷跷板),关于theta_{12}测定和μ-τ破缺观测量之间的相关性,这个Z_2 ^s和它可能的部分破坏的物理结果。

英文摘要:

We conjecture that all CP violations (both Dirac and Majorana types) arise from a common origin in neutrino seesaw. With this conceptually attractive and simple conjecture, we deduce that mu-tau breaking shares the common origin with all CP violations. We study the common origin of mu-tau and CP breaking in the Dirac mass matrix of seesaw Lagrangian (with right-handed neutrinos being mu-tau blind), which uniquely leads to inverted mass-ordering of light neutrinos. We then predict a very different correlation between the two small mu-tau breaking observables theta_{13}-0 and theta_{23}-45, which can saturate the present experimental upper limit on theta_{13}. This will be tested against our previous normal mass-ordering scheme by the on-going oscillation experiments. We also analyze the correlations of theta_{13} with Jarlskog invariant and neutrinoless double-beta-decay observable. From the common origin of CP and mu-tau breaking in the neutrino seesaw, we establish a direct link between the low energy CP violations and the cosmological CP violation for baryon asymmetry. With these we further predict a lower bound on theta_{13}, supporting the on-going probes of theta_{13} at Daya Bay, Double Chooz and RENO experiments. Finally, we analyze the general model-independent Z_2 x Z_2 symmetry structure of the light neutrino sector, and map it into the seesaw sector, where one of the Z_2's corresponds to the mu-tau symmetry and another the hidden symmetry Z_2^s (revealed in our previous work) which dictates the solar mixing angle θ_{12}. We derive the physical consequences of this Z_2^s and its possible partial violation in the presence of mu-tau breaking (without or with neutrino seesaw), regarding the theta_{12} determination and the correlation between mu-tau breaking observables.

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