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

Broken S3L×S3R flavor symmetry and leptonic CP violation

  • 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

  • In the framework of the canonical seesaw model, we present a simple but viable scenario to explicitly break an S3L×S3R 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., me/mμ and mμ/mτ) 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.
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Zong-guo Si, Xing-hua Yang and Shun Zhou. Broken S3L×S3R 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 S3L×S3R 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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Received: 2017-06-19
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    Supported by NNSFC (11325525), National Recruitment Program for Young Professionals and CAS Center for Excellence in Particle Physics (CCEPP)

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Broken S3L×S3R flavor symmetry and leptonic CP violation

    Corresponding author: Zong-guo Si,
    Corresponding author: Xing-hua Yang,
    Corresponding author: Shun Zhou,
  • 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
  • Received Date: 2017-06-19
  • Available Online: 2017-11-05
Fund Project:  Supported by NNSFC (11325525), National Recruitment Program for Young Professionals and CAS Center for Excellence in Particle Physics (CCEPP)

Abstract: In the framework of the canonical seesaw model, we present a simple but viable scenario to explicitly break an S3L×S3R 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., me/mμ and mμ/mτ) 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.

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