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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1203.2646hep-ph
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自发轻子CP破坏和非零$θ_{13}$

Spontaneous leptonic CP violation and nonzero $θ_{13}$

G. C. Branco, R. Gonzalez Felipe, F. R. Joaquim, H. Serodio

摘要:

我们考虑一个简单的扩展的标准模型通过添加两个希格斯三重态和一个复杂的标量单线态的粒子内容。在这个框架中,CP对称性在高能时被标量单态的复真空期望值自发破缺。这种破缺导致低能轻子CP破坏。该模型还表现出一个$A_4\times Z_4$味对称性,被自发打破后,在高能量的规模,产生的轻子部门的tribimportament模式。我们认为周围的tribimmaximal真空对齐条件的小扰动,以产生非零值的$θ_{13}$,所需的最新中微子振荡数据。结果表明,大亚湾中微子实验最近测得的$θ_{13}$值可以与大的Dirac-type CP破坏一起容纳在我们的框架中。我们还解决了leptogenesis在我们的模型中,通过希格斯三胞胎的平衡衰变的可行性。特别是,在三重态衰变成两个轻子的CP不对称性的计算和它示出的有效leptogenesis和低能量CP违反阶段直接相连。

英文摘要:

We consider a simple extension of the Standard Model by adding two Higgs triplets and a complex scalar singlet to its particle content. In this framework, the CP symmetry is spontaneously broken at high energies by the complex vacuum expectation value of the scalar singlet. Such a breaking leads to leptonic CP violation at low energies. The model also exhibits an $A_4\times Z_4$ flavour symmetry which, after being spontaneously broken at a high-energy scale, yields a tribimaximal pattern in the lepton sector. We consider small perturbations around the tribimaximal vacuum alignment condition in order to generate nonzero values of $θ_{13}$, as required by the latest neutrino oscillation data. It is shown that the value of $θ_{13}$ recently measured by the Daya Bay Reactor Neutrino Experiment can be accommodated in our framework together with large Dirac-type CP violation. We also address the viability of leptogenesis in our model through the out-of-equilibrium decays of the Higgs triplets. In particular, the CP asymmetries in the triplet decays into two leptons are computed and it is shown that the effective leptogenesis and low-energy CP-violating phases are directly linked.

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