scholarly journals A radiatively induced neutrino mass model with hidden local U(1) and LFV processes ℓi → ℓjγ, μ → eZ′ and μe → ee

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Takaaki Nomura ◽  
Hiroshi Okada ◽  
Yuichi Uesaka
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Mass Model ◽  
Mass Generation ◽  
Hidden Sector ◽  
Lepton Flavor ◽  
The Standard Model ◽  
Neutrino Mass Generation

Abstract We investigate a model based on hidden U(1)X gauge symmetry in which neutrino mass is induced at one-loop level by effects of interactions among particles in hidden sector and the Standard Model leptons. Neutrino mass generation is also associated with U(1)X breaking scale which is taken to be low to suppress neutrino mass. Then we formulate neutrino mass matrix, lepton flavor violating processes and muon g − 2 which are induced via interactions among Standard Model leptons and particles in U(1)X hidden sector that can be sizable in our scenario. Carrying our numerical analysis, we show expected ratios for these processes when generated neutrino mass matrix can fit the neutrino data.

scholarly journals HIDING THE EXISTENCE OF A FAMILY SYMMETRY IN THE STANDARD MODEL

2005 ◽  
Vol 20 (36) ◽  
pp. 2767-2774 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Higgs Sector ◽  
Higgs Doublet ◽  
Neutrino Mass Matrix ◽  
Tree Level ◽  
Family Symmetry ◽  
The Standard Model

If a family symmetry exists for the quarks and leptons, the Higgs sector is expected to be enlarged to be able to support the transformation properties of this symmetry. There are, however, three possible generic ways (at tree level) of hiding this symmetry in the context of the Standard Model with just one Higgs doublet. All three mechanisms have their natural realizations in the unification symmetry E6 and one in SO (10). An interesting example based on SO (10)×A4 for the neutrino mass matrix is discussed.

scholarly journals Neutrino masses in the SU(4)L ⊗ U(1)X electroweak extension of the Standard Model

2016 ◽  
Vol 31 (25) ◽  
pp. 1650142 ◽  
Author(s):  
Guillermo Palacio
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Tree Level ◽  
Neutrino Masses ◽  
Particle Content ◽  
Mass Generation ◽  
The Standard Model ◽  
Neutrino Mass Generation ◽  
Effective Operators ◽  
Family Models

We study the neutrino mass generation in the [Formula: see text] electroweak extension of the Standard Model by considering nonrenormalizable dimension 5 effective operators. It is shown that there exist two topologies for the realizations of such an operator at the tree-level and for one of the three-family models the neutrino phenomenology is explored after extending its particle content with an [Formula: see text] fermion singlet and a scalar decuplet. Constraints in the available parameters space of the model are partially discussed.

scholarly journals LEPTON FAMILY SYMMETRY AND NEUTRINO MASS MATRIX

2004 ◽  
Vol 19 (08) ◽  
pp. 577-582 ◽  
Author(s):  
ERNEST MA
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Solar Neutrino ◽  
Charged Lepton ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Diagonal Form ◽  
Family Symmetry ◽  
The Standard Model ◽  
Lepton Family

The standard model of leptons is extended to accommodate a discrete Z3×Z2 family symmetry. After rotating the charged-lepton mass matrix to its diagonal form, the neutrino mass matrix reveals itself as very suitable for explaining atmospheric and solar neutrino oscillation data. A generic requirement of this approach is the appearance of three Higgs doublets at the electroweak scale, with observable flavor violating decays.

scholarly journals Scalar clockwork and flavor neutrino mass matrix

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Teruyuki Kitabayashi
Keyword(s):  
Standard Model ◽  
Neutrino Mass ◽  
Mass Matrix ◽  
Neutrino Mass Matrix ◽  
Model Parameters ◽  
Yukawa Couplings ◽  
Flavor Structure ◽  
Site Number ◽  
The Standard Model

Abstract We study the capability of generating the correct flavor neutrino mass matrix in a scalar clockwork model. First, we assume that the flavor structure is controlled by the Yukawa couplings as in the standard model. In this case, the correct flavor neutrino mass matrix could be obtained by appropriate Yukawa couplings $Y_{\ell^\prime\ell}$ where $\ell^\prime, \ell = e, \mu, \tau$. Next, we assume that the Yukawa couplings are extremely democratic: $|Y_{\ell^\prime\ell} |=1$. In this case, the model parameters of the scalar clockwork sector, such as the site number of a clockwork gear in a clockwork chain, should have the flavor indices $\ell^\prime$ and/or $\ell$ to generate the correct flavor neutrino mass matrix. We show some examples of assignments of the flavor indices which can yield the correct flavor neutrino mass matrix.

scholarly journals The Low-Scale Approach to Neutrino Masses

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Sofiane M. Boucenna ◽  
Stefano Morisi ◽  
José W. F. Valle
Keyword(s):  
Neutrino Mass ◽  
Cold Dark Matter ◽  
Short Review ◽  
Neutrino Masses ◽  
Lepton Flavor Violation ◽  
Mass Generation ◽  
Lepton Flavor ◽  
Flavor Violation ◽  
Phenomenological Potential ◽  
Neutrino Mass Generation

In this short review we revisit the broad landscape of low-scaleSU(3)c⊗SU(2)L⊗U(1)Ymodels of neutrino mass generation, with view on their phenomenological potential. This includes signatures associated to direct neutrino mass messenger production at the LHC, as well as messenger-induced lepton flavor violation processes. We also briefly comment on the presence of WIMP cold dark matter candidates.

scholarly journals Testing neutrino mass generation mechanisms from the lepton flavor violating decay of the Higgs boson

2016 ◽  
Vol 763 ◽  
pp. 352-357 ◽  
Author(s):  
Mayumi Aoki ◽  
Shinya Kanemura ◽  
Kodai Sakurai ◽  
Hiroaki Sugiyama
Keyword(s):  
Higgs Boson ◽  
Neutrino Mass ◽  
Mass Generation ◽  
Lepton Flavor ◽  
Neutrino Mass Generation ◽  
Generation Mechanisms
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