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

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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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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CONSTRAINTS ON TeV SCALE MAJORANA NEUTRINO PHENOMENOLOGY FROM THE VACUUM STABILITY OF THE HIGGS

Modern Physics Letters A ◽

10.1142/s0217732313500326 ◽

2013 ◽

Vol 28 (11) ◽

pp. 1350032 ◽

Cited By ~ 18

Author(s):

JOYDEEP CHAKRABORTTY ◽

MOUMITA DAS ◽

SUBHENDRA MOHANTY

Keyword(s):

Beta Decay ◽

Neutrino Mass ◽

Stability Condition ◽

Branching Ratio ◽

Neutrinoless Double Beta Decay ◽

Majorana Neutrino ◽

Double Beta Decay ◽

Heavy Neutrino ◽

Neutrino Mixing ◽

Vacuum Stability

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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A STRATEGY FOR DISCOVERING HEAVY NEUTRINOS

International Journal of Modern Physics A ◽

10.1142/s0217751x96000791 ◽

1996 ◽

Vol 11 (09) ◽

pp. 1607-1611

Author(s):

CLEMENS A. HEUSCH ◽

PETER MINKOWSKI

Keyword(s):

Energy Range ◽

Beta Decay ◽

Neutrino Mass ◽

Particle Physics ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Mass Problem ◽

Lepton Flavor ◽

Majorana Neutrinos ◽

Unique Capability

Same-sign lepton collisions in the TeV energy range may well have the unique capability to search for clear signals for the exchange of heavy Majorana neutrinos. Lepton-flavor-violating transitions e−e−→W−W− can thus contribute to the understanding of two unsolved riddles in particle physics: the neutrino mass problem and the question of the Dirac or Majorana character of heavy neutrinos. This search is not similarly accessible to such effects as neutrinoless double beta decay. The resulting experimental signatures are hard to miss.

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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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IS Ue3 REALLY RELATED TO THE SOLAR NEUTRINO SOLUTIONS?

Modern Physics Letters A ◽

10.1142/s0217732300002838 ◽

2000 ◽

Vol 15 (37) ◽

pp. 2257-2263

Author(s):

N. HABA ◽

TOMOHARU SUZUKI

Keyword(s):

Physical Parameter ◽

Neutrino Oscillation ◽

Neutrino Mass ◽

Solar Neutrino ◽

Mass Matrix ◽

Majorana Neutrino ◽

Lepton Flavor ◽

Flavor Mixing ◽

Mixing Matrix ◽

Majorana Neutrino Mass

It is important to measure Ue3 in the lepton flavor mixing matrix in order to understand the structure of Majorana neutrino mass matrix. Recently it is conjectured that the measurement of Ue3 would discriminate one solution among various solar neutrino ones provided that the three mass eigenvalues of neutrinos have the relation m1≪m2≪m3 or m1~m2≪m3. In this letter we show that this conjecture is rather restrictive and the relation [Formula: see text] is derived by a nontrivial assumption and Ue3 cannot discriminate among solar neutrino oscillation solutions without the information on another physical parameter.

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NEUTRINO OSCILLATIONS AND LEPTON FLAVOR MIXING

Modern Physics Letters A ◽

10.1142/s0217732301005473 ◽

2001 ◽

Vol 16 (33) ◽

pp. 2169-2175 ◽

Cited By ~ 16

Author(s):

KYUNGSIK KANG ◽

SIN KYU KANG ◽

C. S. KIM ◽

SUN MYONG KIM

Keyword(s):

Neutrino Mass ◽

Mass Matrix ◽

Neutrino Masses ◽

Input Constraints ◽

Neutrino Mixing ◽

Lepton Flavor ◽

Invariance Violation ◽

The Family ◽

Flavor Mixing ◽

Mixing Matrix

In view of the recent announcement on nonzero neutrino mass from Super-Kamiokande experiment, it would be very timely to investigate all the possible scenarios on masses and mixings of light neutrinos. Recently suggested mass matrix texture for the quark CKM mixing, which can be originated from the family permutation symmetry and its suitable breakings, is assumed for the neutrino mass matrix and determined by the four combinations of solar, atmospheric and LSND neutrino data and cosmological hot dark matter bound as input constraints. The charged-lepton mass matrix is assumed to be diagonal so that the neutrino mixing matrix can be identified directly as the lepton flavor mixing matrix and no CP invariance violation originates from the leptonic sector. The results favor hierarchical patterns for the neutrino masses, which follow from the case when the solar-atmospheric data is used.

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NEUTRINO PARAMETER SPACE FOR A VANISHING ee ELEMENT IN THE NEUTRINO MASS MATRIX

Modern Physics Letters A ◽

10.1142/s0217732307021767 ◽

2007 ◽

Vol 22 (19) ◽

pp. 1401-1410 ◽

Cited By ~ 27

Author(s):

S. DEV ◽

SANJEEV KUMAR

Keyword(s):

Beta Decay ◽

Neutrino Mass ◽

Parameter Space ◽

Mass Matrix ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Neutrino Mass Matrix ◽

Majorana Mass ◽

Texture Zero ◽

Majorana Neutrinos

The consequences of a texture zero at the ee entry of neutrino mass matrix in the flavor basis, which also implies a vanishing effective Majorana mass for neutrinoless double beta decay, have been studied for Majorana neutrinos. The neutrino parameter space under this condition has been constrained in the light of all available neutrino data including the CHOOZ bound on [Formula: see text].

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THE MINIMAL TYPE-II SEESAW MODEL AND FLAVOR-DEPENDENT LEPTOGENESIS

International Journal of Modern Physics A ◽

10.1142/s0217751x08042225 ◽

2008 ◽

Vol 23 (21) ◽

pp. 3412-3415

Author(s):

SHU LUO ◽

ZHI-ZHONG XING

Keyword(s):

Neutrino Mass ◽

Mass Matrix ◽

Baryon Number ◽

Majorana Neutrino ◽

Type Ii ◽

Neutrino Mixing ◽

Seesaw Model ◽

Mixing Matrix ◽

Current Experimental Data ◽

Minimal Type

Current experimental data allow the zero value for one neutrino mass, either m1 = 0 or m3 = 0. This observation implies that a realistic neutrino mass texture can be established by starting from the limit (a) m1 = m2 = 0 and m3 ≠ 0 or (b) m1 = m2 ≠ 0 and m3 = 0. In both cases, we may introduce a particular perturbation which ensures the resultant neutrino mixing matrix to be the tri-bimaximal mixing pattern or its viable variations. We find that it is natural to incorporate this kind of neutrino mass matrix in the minimal Type-II seesaw model with only one heavy right-handed Majorana neutrino N. We show that it is possible to account for the cosmological baryon number asymmetry in the m3 = 0 case via thermal leptogenesis, in which the CP-violating asymmetry of N decays is attributed to the electron flavor.

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LEPTON FLAVOR VIOLATION, LEPTOGENESIS AND NEUTRINO MIXING IN QUARK-LEPTON COMPLEMENTARITY SCENARIOS

International Journal of Modern Physics A ◽

10.1142/s0217751x07039092 ◽

2007 ◽

Vol 22 (31) ◽

pp. 5875-5888 ◽

Cited By ~ 2

Author(s):

WERNER RODEJOHANN ◽

KATHRIN A. HOCHMUTH

Keyword(s):

Detailed Analysis ◽

Beta Decay ◽

Neutrinoless Double Beta Decay ◽

Double Beta Decay ◽

Lepton Flavor Violation ◽

Neutrino Mixing ◽

Lepton Flavor ◽

Flavor Violation

We conduct a detailed analysis of the phenomenology of two predictive see-saw scenarios which lead to the Quark-Lepton Complementarity relation θ12+θC = π/4. The neutrino mixing observables and their correlations, neutrinoless double beta decay, lepton flavor violating decays such as μ → eγ and leptogenesis are discussed. The features which allow to distinguish the scenarios are identified.

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