Phenomenology in the Zee model with the A{sub 4} symmetry

Journal Article · Tue Mar 01 00:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.056016· OSTI ID:21537474

Fukuyama, Takeshi ^[1]; Sugiyama, Hiroaki ^[1]; Tsumura, Koji ^[2]

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1. Department of Physics and R-GIRO, Ritsumeikan University, Kusatsu, Shiga 525-8577 (Japan)
2. The Abdus Salam ICTP of UNESCO and IAEA, Strada Costiera 11, 34151 Trieste (Italy)

The Zee model generates neutrino masses at the one-loop level by adding charged SU(2){sub L}-singlet and extra SU(2){sub L}-doublet scalars to the standard model of particle physics. We introduce the softly broken A{sub 4} symmetry to the Zee model as the origin of the nontrivial structure of the lepton flavor mixing. This model is compatible with the tribimaximal mixing which agrees well with neutrino oscillation measurements. Then, a sum rule m{sub 1}e{sup i{alpha}{sub 12}}+2m{sub 2}+3m{sub 3}e{sup i{alpha}{sub 32}}=0 is obtained and it results in {Delta}m{sub 31}{sup 2}<0 and m{sub 3}{>=}1.8x10{sup -2} eV. The effective mass |(M{sub {nu}}){sub ee}| for the neutrinoless double beta decay is predicted as |(M{sub {nu}}){sub ee}|{>=}1.7x10{sup -2} eV. The characteristic particles in this model are SU(2){sub L}-singlet charged Higgs bosons s{sub {alpha}}{sup +}({alpha}={xi},{eta},{zeta}) which are made from a 3 representation of A{sub 4}. Contributions of s{sub {alpha}}{sup {+-}} to the lepton flavor violating decays of charged leptons are almost forbidden by an approximately remaining Z{sub 3} symmetry; only BR({tau}{yields}{bar e}{mu}{mu}) can be sizable by the flavor changing neutral current interaction with SU(2){sub L}-doublet scalars. Therefore, s{sub {alpha}}{sup {+-}} can easily be light enough to be discovered at the LHC with satisfying current constraints. The flavor structures of BR(s{sub {alpha}}{sup -}{yields}l{nu}) are also discussed.

• OSTI ID: 21537474
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 5; Other Information: DOI: 10.1103/PhysRevD.83.056016; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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