Low-energy limits on heavy Majorana neutrino masses from the neutrinoless double-beta decay and non-unitary neutrino mixing

The vacuum stability condition of the Standard Model (SM) Higgs potential with mass in the range of 124–127 GeV puts an upper bound on the Dirac mass of the neutrinos. We study this constraint with the right-handed neutrino masses up to TeV scale. The heavy neutrinos contribute to ΔL = 2 processes like neutrinoless double beta decay and same-sign-dilepton (SSD) production in the colliders. The vacuum stability criterion also restricts the light-heavy neutrino mixing and constrains the branching ratio (BR) of lepton flavor-violating process, like μ→eγ mediated by the heavy neutrinos. We show that neutrinoless double beta decay with a lifetime ~1025 years can be observed if the lightest heavy neutrino mass is <4.5 TeV. We show that the vacuum stability condition and the experimental bound on μ→e γ together put a constrain on heavy neutrino mass MR>3.3 TeV. Finally we show that the observation of SSDs associated with jets at the LHC needs much larger luminosity than available at present. We have estimated the possible maximum cross-section for this process at the LHC and show that with an integrated luminosity 100 fb-1 it may be possible to observe the SSD signals as long as MR < 400 GeV.

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Oscillating Neutrinos and Majorana Neutrino Masses

Universe ◽

10.3390/universe6020029 ◽

2020 ◽

Vol 6 (2) ◽

pp. 29

Author(s):

Harald Fritzsch

Keyword(s):

Beta Decay ◽

Neutrino Mass ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Neutrino Masses ◽

Quark Masses ◽

Mass Matrices ◽

The Matrix ◽

Flavor Mixing

We discuss the mass matrices with texture zeros for the quarks and leptons. The flavor mixing angles for the quarks are functions of the quark masses and can be calculated. The results agree with the experimental data. The texture zero mass matrices for the leptons and the see-saw mechanism are used to derive relations between the matrix elements of the lepton mixing matrix and the ratios of the neutrino masses. Using the measured neutrino mass differences, the neutrino masses can be calculated. The neutrinoless double beta decay is discussed. The effective Majorana neutrino mass, describing the neutrinoless double beta decay, can be calculated—it is about 4.6 meV. The present experimental limit is at least twenty times larger.

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Cobimaximal neutrino mixing in the U(1)B−L extension with A4 symmetry

Modern Physics Letters A ◽

10.1142/s0217732320503113 ◽

2020 ◽

Vol 35 (38) ◽

pp. 2050311

Author(s):

V. V. Vien

Keyword(s):

Beta Decay ◽

Atmospheric Neutrino ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Tree Level ◽

Physical Parameters ◽

Neutrino Masses ◽

Type I ◽

Neutrino Mixing ◽

Best Fit

We propose a renormalizable [Formula: see text] extension of the Standard model with [Formula: see text] symmetry that leads to the successful cobimaximal lepton mixing ansatz, thus providing a predictive explanation for leptonic mixing observables. The smallness of the active neutrino masses and neutrino masses ordering are produced by the type-I seesaw mechanism at the tree-level. The obtained physical parameters are well consistent with the global fit of neutrino oscillation.1 The model is predictive in the sense that it reproduces the experimental values of neutrino parameters in which the reactor neutrino mixing angle [Formula: see text] get the best-fit value and the solar and atmospheric neutrino mixing angles have little deviations from the best-fit values given in Ref. 1, however, they are consistent with the other experimental results.[Formula: see text] The effective neutrino masses governing the neutrinoless double beta decay is predicted to be [Formula: see text] for normal hierarchy and [Formula: see text] for inverted hierarchy which are well consistent with the recent experimental limits on neutrinoless double beta decay.

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The SO(10)-inspired leptogenesis timely opportunity

Journal of High Energy Physics ◽

10.1007/jhep08(2020)124 ◽

2020 ◽

Vol 2020 (8) ◽

Cited By ~ 1

Author(s):

Pasquale Di Bari ◽

Rome Samanta

Keyword(s):

Beta Decay ◽

Neutrino Mass ◽

Lower Bounds ◽

Neutrinoless Double Beta Decay ◽

Mass Scale ◽

Double Beta Decay ◽

Neutrino Masses ◽

Neutrino Mixing ◽

Mixing Parameters ◽

Absolute Neutrino Mass

Abstract We study the connection between absolute neutrino mass and neutrino mixing parameters within SO(10)-inspired leptogenesis. We show that current favoured values of the unknown neutrino mixing parameters point toward values of the absolute neutrino mass scale that will be fully tested by cosmological observations and neutrinoless double beta decay experiments during next years. In particular, for mD2/mcharm≤ 5, where mD2 is the intermediate Dirac neutrino mass, and for current best fit values of the Dirac phase δ and the atmospheric mixing angle θ23, we derive a lower bound on the neutrinoless double beta decay effective neutrino mass mee ≳ 31 meV and on the sum of the neutrino masses Σimi ≳ 125 meV. These lower bounds hold for normally ordered neutrino masses, as currently favoured by global analyses, and approximately for δ ∈ [155°, 240°] and θ23 in the second octant. If values in this region will be confirmed by future planned long baseline experiments, then a signal at next generation neutrinoless double beta decay experiments is expected, despite neutrino masses being normally ordered. Outside the region, the lower bounds strongly relax but a great fraction of the allowed range of values still allows a measurement of the lightest neutrino mass. Therefore, in the next years low energy neutrino experiments will provide a stringent test of SO(10)-inspired leptogenesis, that might result either in severe constraints or in a strong evidence.

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Three Flavor Quasi-Dirac Neutrino Mixing, Oscillations and Neutrinoless Double Beta Decay

Symmetry ◽

10.3390/sym12081310 ◽

2020 ◽

Vol 12 (8) ◽

pp. 1310

Author(s):

Amina Khatun ◽

Adam Smetana ◽

Fedor Šimkovic

Keyword(s):

Standard Model ◽

Beta Decay ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Unitary Matrix ◽

Neutrino Mixing ◽

Dirac Neutrino ◽

The Standard Model ◽

Majorana Neutrino Mass

The extension of the Standard model by three right-handed neutrino fields exhibit appealing symmetry between left-handed and right-handed sectors, which is only violated by interactions. It can accommodate three flavor quasi-Dirac neutrino mixing scheme, which allows processes with violation of both lepton flavor and total lepton number symmetries. We propose a 6×6 unitary matrix for parameterizing the mixing among three flavors of quasi-Dirac neutrino. This mixing matrix is constructed by two 3×3 unitary matrices that diagonalizes the Dirac mass term in the Lagrangian. By only assuming the Standard Model V−A weak interaction, it is found that probabilities of neutrino oscillations among active flavor states and effective masses measured by single beta decay, by neutrinoless double-beta decay and by cosmology only depend on single 3×3 unitary matrix relevant to mixing of active neutrino flavors. Further, by considering 1σ and 3σ uncertainties in the measured oscillation probability of electron antineutrino from reactor, derivation of the constraint on the Majorana neutrino mass component is demonstrated. The consequence for effective Majorana neutrino mass governing the neutrinoless double-beta decay is discussed.

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Remark on Majorana CP phases in neutrino mixing and leptogenesis

Modern Physics Letters A ◽

10.1142/s0217732314500874 ◽

2014 ◽

Vol 29 (16) ◽

pp. 1450087

Author(s):

Teruyuki Kitabayashi ◽

Naoto Koizumi

Keyword(s):

Beta Decay ◽

Neutrino Mass ◽

Half Life ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Neutrino Mixing ◽

Seesaw Model ◽

Mixing Matrix ◽

Majorana Neutrino Mass

We estimate Majorana CP phases for a simple flavor neutrino mixing matrix which has been reported by Qu and Ma. Sizes of Majorana CP phases are evaluated in the study of the neutrinoless double beta decay and a particular leptogenesis scenario. We find the dependence of the physically relevant Majorana CP phase on the mass of lightest right-handed neutrino in the minimal seesaw model and the effective Majorana neutrino mass which is related with the half-life of the neutrinoless double beta decay.

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Neutrino mixing with nonzero θ13 and CP violation in the 3-3-1 model based on A4 flavor symmetry

International Journal of Modern Physics A ◽

10.1142/s0217751x15501171 ◽

2015 ◽

Vol 30 (21) ◽

pp. 1550117 ◽

Cited By ~ 20

Author(s):

Vo Van Vien ◽

Hoang Ngoc Long

Keyword(s):

Cp Violation ◽

Effective Mass ◽

Beta Decay ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Neutrino Masses ◽

Flavor Symmetry ◽

Neutrino Mixing ◽

Fermion Masses ◽

New Formula

We propose a 3-3-1 model with neutral fermions based on [Formula: see text] flavor symmetry responsible for fermion masses and mixings with nonzero [Formula: see text]. To get realistic neutrino mixing, we just add a new [Formula: see text] triplet being in [Formula: see text] under [Formula: see text]. The neutrinos get small masses from two [Formula: see text] antisextets and one [Formula: see text] triplet. The model can fit the present data on neutrino masses and mixing as well as the effective mass governing neutrinoless double beta decay. Our results show that the neutrino masses are naturally small and a little deviation from the tri-bimaximal neutrino mixing form can be realized. The Dirac CP violation phase [Formula: see text] is predicted to either [Formula: see text] or [Formula: see text] with [Formula: see text].

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Majorana neutrino masses and the neutrinoless double-beta decay

Physics of Atomic Nuclei ◽

10.1134/s1063778806120106 ◽

2006 ◽

Vol 69 (12) ◽

pp. 2078-2082

Author(s):

A. Faessler

Keyword(s):

Beta Decay ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Neutrino Masses

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NEUTRINOLESS DOUBLE-BETA DECAY: A BRIEF REVIEW

Modern Physics Letters A ◽

10.1142/s0217732312300157 ◽

2012 ◽

Vol 27 (13) ◽

pp. 1230015 ◽

Cited By ~ 108

Author(s):

S. M. BILENKY ◽

C. GIUNTI

Keyword(s):

Beta Decay ◽

Neutrino Oscillation ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Daya Bay ◽

Neutrino Masses ◽

Seesaw Mechanism ◽

Majorana Mass

In this brief review we discuss the generation of Majorana neutrino masses through the seesaw mechanism, the theory of neutrinoless double-beta decay, the implications of neutrino oscillation data for the effective Majorana mass, taking into account the recent Daya Bay measurement of ϑ13, and the interpretation of the results of neutrinoless double-beta decay experiments.

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