Neutrino mass observables and non-Hermitian version of Type-I seesaw model

Abstract We explore proton decay in a class of realistic supersymmetric flipped SU(5) models supplemented by a U(1)R symmetry which plays an essential role in implementing hybrid inflation. Two distinct neutrino mass models, based on inverse seesaw and type I seesaw, are identified, with the latter arising from the breaking of U(1)R by nonrenormalizable superpotential terms. Depending on the neutrino mass model an appropriate set of intermediate scale color triplets from the Higgs superfields play a key role in proton decay channels that include p → (e+, μ+) π0, p → (e+, μ+) K0, p →$$ \overline{v}{\pi}^{+} $$ v ¯ π + , and p →$$ \overline{v}{K}^{+} $$ v ¯ K + . We identify regions of the parameter space that yield proton lifetime estimates which are testable at Hyper-Kamiokande and other next generation experiments. We discuss how gauge coupling unification in the presence of intermediate scale particles is realized, and a Z4 symmetry is utilized to show how such intermediate scales can arise in flipped SU(5). Finally, we compare our predictions for proton decay with previous work based on SU(5) and flipped SU(5).

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Relaxing cosmological neutrino mass bounds with unstable neutrinos

Journal of High Energy Physics ◽

10.1007/jhep12(2020)119 ◽

2020 ◽

Vol 2020 (12) ◽

Author(s):

Miguel Escudero ◽

Jacobo Lopez-Pavon ◽

Nuria Rius ◽

Stefan Sandner

Keyword(s):

Neutrino Mass ◽

Particle Physics ◽

Goldstone Boson ◽

Mass Scale ◽

Simple Extension ◽

Type I ◽

Mass Generation ◽

Age Of The Universe ◽

Neutrino Mass Models ◽

The Right

Abstract At present, cosmological observations set the most stringent bound on the neutrino mass scale. Within the standard cosmological model (ΛCDM), the Planck collaboration reports ∑mv< 0.12 eV at 95 % CL. This bound, taken at face value, excludes many neutrino mass models. However, unstable neutrinos, with lifetimes shorter than the age of the universe τν ≲ tU, represent a particle physics avenue to relax this constraint. Motivated by this fact, we present a taxonomy of neutrino decay modes, categorizing them in terms of particle content and final decay products. Taking into account the relevant phenomenological bounds, our analysis shows that 2-body decaying neutrinos into BSM particles are a promising option to relax cosmological neutrino mass bounds. We then build a simple extension of the type I seesaw scenario by adding one sterile state ν4 and a Goldstone boson ϕ, in which νi→ ν4ϕ decays can loosen the neutrino mass bounds up to ∑mv ∼ 1 eV, without spoiling the light neutrino mass generation mechanism. Remarkably, this is possible for a large range of the right-handed neutrino masses, from the electroweak up to the GUT scale. We successfully implement this idea in the context of minimal neutrino mass models based on a U(1)μ−τ flavor symmetry, which are otherwise in tension with the current bound on ∑mv.

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$$U(1)_{B-L}$$ extension of the standard model with $$S_3$$ symmetry

The European Physical Journal C ◽

10.1140/epjc/s10052-020-8318-7 ◽

2020 ◽

Vol 80 (8) ◽

Author(s):

V. V. Vien ◽

H. N. Long ◽

A. E. Cárcamo Hernández

Keyword(s):

Standard Model ◽

Neutrino Mass ◽

Liquid Scintillator ◽

High Energy ◽

Fermion Mass ◽

Physical Parameters ◽

Type I ◽

Inverted Hierarchy ◽

Quark Masses ◽

Quark Sector

Abstract We propose a renormalizable $$B-L$$B-L Standard Model (SM) extension based on $$S_3$$S3 symmetry which successfully accommodates the observed fermion mass spectra and flavor mixing patterns as well as the CP violating phases. The small masses for the light active neutrinos are generated through a type I seesaw mechanism. The obtained physical parameters in the lepton sector are well consistent with the global fit of neutrino oscillations (Esteban et al. in J High Energy Phys 01:106, 2019) for both normal and inverted neutrino mass orderings. The model also predicts effective neutrino mass parameters of $${\langle m_{ee}\rangle }= {1.02\times 10^{-2}}\,{\mathrm {eV}},\, m_{\beta }= {1.25}\times 10^{-2}\,{\mathrm {eV}}$$⟨mee⟩=1.02×10-2eV,mβ=1.25×10-2eV for normal hierarchy (NH) and $${\langle m_{ee}\rangle } ={5.03}\times 10^{-2}\, {\mathrm {eV}},\, m_{\beta } ={5.05}\times 10^{-2}\, {\mathrm {eV}}$$⟨mee⟩=5.03×10-2eV,mβ=5.05×10-2eV for inverted hierarchy (IH) which are all well consistent with the future large and ultra-low background liquid scintillator detectors which has been discussed in Ref. (Zhao et al. in Chin Phys C 41(5):053001, 2017) or the limit of the effective neutrino mass can be reached by the planning of future experiments. The model results are consistent with and successfully accommodate the recent experimental values of the physical observables of the quark sector, including the six quark masses, the quark mixing angles and the CP violating phase in the quark sector.

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NEUTRINO MASSES, LEPTON FLAVOR MIXING AND LEPTOGENESIS IN THE MINIMAL SEESAW MODEL

International Journal of Modern Physics E ◽

10.1142/s0218301307004898 ◽

2007 ◽

Vol 16 (01) ◽

pp. 1-50 ◽

Cited By ~ 76

Author(s):

WAN-LEI GUO ◽

ZHI-ZHONG XING ◽

SHUN ZHOU

Keyword(s):

Beta Decay ◽

Neutrino Mass ◽

Mass Matrix ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Neutrino Mixing ◽

Lepton Flavor ◽

Seesaw Model ◽

Flavor Mixing ◽

Majorana Neutrinos

We present a review of neutrino phenomenology in the minimal seesaw model (MSM), an economical and intriguing extension of the Standard Model with only two heavy right-handed Majorana neutrinos. Given current neutrino oscillation data, the MSM can predict the neutrino mass spectrum and constrain the effective masses of the tritium beta decay and the neutrinoless double-beta decay. We outline five distinct schemes to parameterize the neutrino Yukawa-coupling matrix of the MSM. The lepton flavor mixing and baryogenesis via leptogenesis are investigated in some detail by taking account of possible texture zeros of the Dirac neutrino mass matrix. We derive an upper bound on the CP-violating asymmetry in the decay of the lighter right-handed Majorana neutrino. The effects of the renormalization-group evolution on the neutrino mixing parameters are analyzed, and the correlation between the CP-violating phenomena at low and high energies is highlighted. We show that the observed matter-antimatter asymmetry of the Universe can naturally be interpreted through the resonant leptogenesis mechanism at the TeV scale. The lepton-flavor-violating rare decays, such as μ→e+γ, are also discussed in the supersymmetric extension of the MSM.

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Investigating two heavy neutral leptons neutrino seesaw mechanism at SHiP

International Journal of Modern Physics A ◽

10.1142/s0217751x19500477 ◽

2019 ◽

Vol 34 (08) ◽

pp. 1950047

Author(s):

Marco Chianese ◽

Damiano F. G. Fiorillo ◽

Gennaro Miele ◽

Stefano Morisi

Keyword(s):

Neutrino Mass ◽

Double Beta Decay ◽

Type I ◽

Mass Generation ◽

Seesaw Mechanism ◽

Mixing Angle ◽

Mechanism Model ◽

Neutrino Mass Generation ◽

Generation Mechanisms ◽

The Masses

One of the main purposes of SHiP experiment is to shed light on neutrino mass generation mechanisms like the so-called seesaw. We consider a minimal type-I seesaw neutrino mass mechanism model with two heavy neutral leptons (right-handed or sterile neutrinos) with arbitrary masses. Extremely high active-sterile mixing angle requires a correlation between the phases of the Dirac neutrino couplings. Actual experimental limits on the half-life of neutrinoless double beta decay [Formula: see text]-rate on the active-sterile mixing angle are not significative in constraining the masses or the mixing measurable by SHiP.

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Fermion masses and mixings in a 3-3-1 model withQ4symmetry

Modern Physics Letters A ◽

10.1142/s0217732319501980 ◽

2019 ◽

Vol 34 (25) ◽

pp. 1950198

Author(s):

V. V. Vien ◽

D. P. Khoi

Keyword(s):

Neutrino Mass ◽

Mass Parameter ◽

Majorana Neutrino ◽

Tree Level ◽

Type I ◽

Inverted Hierarchy ◽

Quark Masses ◽

Fermion Masses ◽

Majorana Neutrino Mass ◽

Good Agreement

We construct a renormalizable [Formula: see text] model with [Formula: see text] symmetry accommodating the observed pattern of fermion masses and mixings with Dirac CP violation phase. The smallness of the active neutrino masses arises from a combination of type I and type II seesaw mechanisms. Both normal and inverted neutrino mass ordering are viable in our model in which the obtained physical observables of the lepton sector are well consistent with the global fit of neutrino oscillation data [P. F. de Salas et al., Phys. Lett. B 782, 633 (2018)] while the CKM matrix is unity at tree level and the quark masses are in good agreement with the experimental data [Particle Data Group (M. Tanabashi et al.), Phys. Rev. D 98, 030001 (2018)]. Furthermore, the model also predicts an effective Majorana neutrino mass parameter of [Formula: see text] eV for normal hierarchy and [Formula: see text] for inverted hierarchy which are consistent with the constraints given in [P. F. de Salas et al., Phys. Lett. B 782, 633 (2018)].

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LOW ENERGY EFFECTIVE LAGRANGIAN FOR SUPERSYMMETRIC SEESAW MODEL

International Journal of Modern Physics E ◽

10.1142/s0218301307006794 ◽

2007 ◽

Vol 16 (05) ◽

pp. 1437-1443

Author(s):

AKINA KATO ◽

TAKUYA MOROZUMI ◽

NORIMI YOKOZAKI ◽

SYN KYU KANG

Keyword(s):

Neutrino Mass ◽

Higgs Mass ◽

Higgs Sector ◽

Low Energy ◽

Seesaw Model ◽

Mass Correction ◽

Effective Lagrangian ◽

The One ◽

The Right ◽

Higgs Fields

Seesaw model is an attractive model because it may explain baryogenesis through leptogenesis and also may explain the small neutrino mass. The supersymmetric seesaw model may be more attractive because the naturalness problem is absent in supersymmetric theory. Recently, the higgs mass correction due to leptons and sleptons loops is computed.1 In this talk, we report on the preliminary results on the one loop corrections of leptons and sleptons loops to the effective action of Higgs sector for super symmetric seesaw model. Our results show that the corrections to the mass parameters for Higgs sector are proportional to the soft breaking parameters of supersymmetric seesaw model, while for the quartic couplings of Higgs fields, the corrections are suppressed by inverse powers of the right-handed neutrino mass.

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Compatibility of θ 13 and the Type I seesaw model with A 4 symmetry

Journal of High Energy Physics ◽

10.1007/jhep02(2013)021 ◽

2013 ◽

Vol 2013 (2) ◽

Cited By ~ 30

Author(s):

Mu-Chun Chen ◽

Jinrui Huang ◽

Jon-Michael O’Bryan ◽

Alexander M. Wijangco ◽

Felix Yu

Keyword(s):

Type I ◽

Seesaw Model

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Lepton masses and mixings in a T′ flavored 3-3-1 model with type I and type II seesaw mechanisms

Modern Physics Letters A ◽

10.1142/s0217732319500056 ◽

2019 ◽

Vol 34 (01) ◽

pp. 1950005 ◽

Cited By ~ 7

Author(s):

V. V. Vien ◽

H. N. Long ◽

A. E. Cárcamo Hernández

Keyword(s):

Neutrino Mass ◽

Mass Parameter ◽

Majorana Neutrino ◽

Type I ◽

Mass Hierarchy ◽

Type Ii ◽

Lepton Sector ◽

Neutrino Mass Hierarchy ◽

Majorana Neutrinos ◽

Majorana Neutrino Mass

We propose a renormalizable T′ flavor model based on the [Formula: see text] gauge symmetry, consistent with the observed pattern of lepton masses and mixings. The small masses of the light active neutrinos are produced from an interplay of type I and type II seesaw mechanisms, which are induced by three heavy right-handed Majorana neutrinos and three [Formula: see text] scalar antisextets, respectively. Our model is only viable for the scenario of normal neutrino mass hierarchy, where the obtained physical observables of the lepton sector are highly consistent with the current neutrino oscillation experimental data. In addition, our model also predicts an effective Majorana neutrino mass parameter of [Formula: see text] eV, a Jarlskog invariant of the order of [Formula: see text] and a leptonic Dirac CP violating phase of [Formula: see text], which is inside the [Formula: see text] experimentally allowed range.

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θ13, μτ SYMMETRY BREAKING AND NEUTRINO YUKAWA TEXTURES

International Journal of Modern Physics A ◽

10.1142/s0217751x13501182 ◽

2013 ◽

Vol 28 (24) ◽

pp. 1350118 ◽

Cited By ~ 16

Author(s):

BISWAJIT ADHIKARY ◽

AMBAR GHOSAL ◽

PROBIR ROY

Keyword(s):

Symmetry Breaking ◽

Neutrino Mass ◽

Charged Lepton ◽

Heavy Neutrino ◽

Type I ◽

Mixing Angles ◽

Order Analysis ◽

A Value ◽

Mass Matrices ◽

Best Fit

Within the type-I seesaw and in the basis where charged lepton and heavy neutrino mass matrices are real and diagonal, μτ symmetric four and three zero neutrino Yukawa textures are perturbed by lowest order μτ symmetry breaking terms. These perturbations are taken to be the most general ones for those textures. For quite small values of those symmetry breaking parameters, permitting a lowest order analysis, current best-fit ranges of neutrino mass squared differences and mixing angles are shown to be accommodable, including a value of θ13 in the observed range, provided all the light neutrinos have an inverted mass ordering.

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