Broken S3L&times;S3R flavor symmetry and leptonic CP violation

Zong-guo Si; Xing-hua Yang; Shun Zhou

doi:10.1088/1674-1137/41/11/113105

Chinese Physics C> 2017, Vol. 41> Issue(11) : 113105 DOI: 10.1088/1674-1137/41/11/113105

Broken S_3L×S_3R flavor symmetry and leptonic CP violation

Zong-guo Si ^1,, ,
Xing-hua Yang ^1,, ,
Shun Zhou ^2,3,4,,

1.
School of Physics, Shandong University, Jinan, Shandong 250100, China
2.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
3.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
4.
Center for High Energy Physics, Peking University, Beijing 100871, China

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Abstract：
In the framework of the canonical seesaw model, we present a simple but viable scenario to explicitly break an S_3L×S_3R flavor symmetry in the leptonic sector. It turns out that the leptonic flavor mixing matrix is completely determined by the mass ratios of the charged leptons (i.e., m_e/m_μ and m_μ/m_τ) and those of light neutrinos (i.e., m₁/m₂ and m₂/m₃). The latest global-fit results of the three neutrino mixing angles θ₁₂, θ₁₃, θ₂₃ and two neutrino mass-squared differences △ m₂₁², △ m₃₁² at the 3σ level are used to constrain the parameter space of m₁/m₂, m₂/m₃. The predictions for the mass spectrum and flavor mixing are highlighted:(1) the neutrino mass spectrum shows a hierarchical pattern and a normal ordering, e.g., m₁ ≈ 2.2 meV, m₂ ≈ 8.8 meV and m₃ ≈ 52.7 meV; (2) only the first octant of θ₂₃ is allowed, namely, 41.8° ≤ θ₂₃ ≤ 43.3° (3) the Dirac CP-violating phase δ ≈ -22° deviates significantly from the maximal value -90°. All these predictions are ready to be tested in ongoing and forthcoming neutrino oscillation experiments. Moreover, we demonstrate that the cosmological matter-antimatter asymmetry can be explained via resonant leptogenesis, including the individual lepton-flavor effects. In our scenario, leptonic CP violation at low-and high-energy scales is closely connected.
- canonical seesaw model ,
- S3L ,
- S3R flavor symmetry ,
- leptonic CP violation ,
- cosmological matter-antimatter asymmetry ,
- resonant leptogenesis

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Zong-guo Si, Xing-hua Yang and Shun Zhou. Broken S_3L×S_3R flavor symmetry and leptonic CP violation[J]. Chinese Physics C, 2017, 41(11): 113105. doi: 10.1088/1674-1137/41/11/113105

Zong-guo Si, Xing-hua Yang and Shun Zhou. Broken S_3L×S_3R flavor symmetry and leptonic CP violation[J]. Chinese Physics C, 2017, 41(11): 113105. doi: 10.1088/1674-1137/41/11/113105 shu

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Broken S_3L×S_3R flavor symmetry and leptonic CP violation

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Broken S_3L×S_3R flavor symmetry and leptonic CP violation

Corresponding author: Zong-guo Si,

Corresponding author: Xing-hua Yang,

Corresponding author: Shun Zhou,

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