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Realization of the minimal extended seesaw mechanism and the TM2_{2} type neutrino mixing

Jan 21, 2020
26 pages
Published in:
  • JHEP 09 (2020) 050,
  • JHEP 20 (2020) 050
  • Published: Sep 7, 2020
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Abstract: (Springer)
We construct a neutrino mass model based on the flavour symmetry group A4_{4}×C4_{4}×C6_{6}×C2_{2} which accommodates a light sterile neutrino in the minimal extended seesaw (MES) scheme. Besides the flavour symmetry, we introduce a U(1) gauge symmetry in the sterile sector and also impose CP symmetry. The vacuum alignments of the scalar fields in the model spontaneously break these symmetries and lead to the construction of the fermion mass matrices. With the help of the MES formulas, we extract the light neutrino masses and the mixing observables. In the active neutrino sector, we obtain the TM2_{2} mixing pattern with non-zero reactor angle and broken μ-τ reflection symmetry. We express all the active and the sterile oscillation observables in terms of only four real model parameters. Using this highly constrained scenario we predict sin⁡2θ23=0.545−0.004+0.003,sin⁡δ=−0.911−0.005+0.006,∣Ue4∣2=0.029−0.008+0.009,∣Uμ4∣2=0.010−0.003+0.003and∣Uτ4∣2=0.006−0.002+0.002 {\sin}^2{\theta}_{23}={0.545}_{-0.004}^{+0.003},\sin \delta =-{0.911}_{-0.005}^{+0.006},{\left|{U}_{e4}\right|}^2={0.029}_{-0.008}^{+0.009},{\left|{U}_{\mu 4}\right|}^2={0.010}_{-0.003}^{+0.003}\kern0.5em \mathrm{and}\kern0.5em {\left|{U}_{\tau 4}\right|}^2={0.006}_{-0.002}^{+0.002} which are consistent with the current data.
Note:
  • 26 pages, 5 figures, version published in JHEP
  • Discrete Symmetries
  • Neutrino Physics
  • Beyond Standard Model
  • neutrino: sterile
  • neutrino: right-handed
  • neutrino: mass
  • neutrino: mixing
  • neutrino: mixing angle
  • neutrino: oscillation
  • phase: CP
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