scholarly journals Relation between Heavy Neutrino Mass and Majorana CP Phase in a Minimal Seesaw Leptogenesis Scenario

2008 ◽  
Vol 120 (3) ◽  
pp. 443-454 ◽  
Author(s):  
T. Kitabayashi
Keyword(s):  
Neutrino Mass ◽  
Heavy Neutrino

scholarly journals Interpolating formula for the 0νββ -decay half-life in the case of light and heavy neutrino mass mechanisms

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
A. Babič ◽  
S. Kovalenko ◽  
M. I. Krivoruchenko ◽  
F. Šimkovic
Keyword(s):  
Neutrino Mass ◽  
Half Life ◽  
Heavy Neutrino

scholarly journals θ13, μτ SYMMETRY BREAKING AND NEUTRINO YUKAWA TEXTURES

2013 ◽  
Vol 28 (24) ◽  
pp. 1350118 ◽  
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.

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

2013 ◽  
Vol 28 (11) ◽  
pp. 1350032 ◽  
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.

A THEORETICAL PATTERN FOR NEUTRINO AND STERILE-NEUTRINO OSCILLATIONS

1989 ◽  
Vol 04 (06) ◽  
pp. 535-541
Author(s):  
JIANG LIU
Keyword(s):  
Neutrino Mass ◽  
Neutrino Oscillations ◽  
Sterile Neutrino ◽  
Mass Term ◽  
Grand Unification ◽  
Heavy Neutrino ◽  
Theoretical Pattern

A theoretical pattern for the MSW oscillation that takes νeL into a sterile particle is discussed. The required small neutrino mass is induced by a seesaw formula, in which the heavy neutrino mass term is of the order of the grand unification scale. Realizations of our scheme are illustrated by a simple SU (2)L × U (1)Y model.

scholarly journals Neutrino mass, mixing and muon g − 2 explanation in $$ \mathrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ extension of left-right theory

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Chayan Majumdar ◽  
Sudhanwa Patra ◽  
Prativa Pritimita ◽  
Supriya Senapati ◽  
Urjit A. Yajnik
Keyword(s):  
Neutrino Mass ◽  
Experimental Result ◽  
Heavy Neutrino ◽  
Symmetric Model ◽  
Neutrino Mixing ◽  
Gauge Bosons ◽  
Seesaw Mechanism ◽  
Singly Charged ◽  
Symmetric Theory ◽  
Negligible Contribution

Abstract We consider a gauged $$ \mathrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ U 1 L μ − L τ extension of the left-right symmetric theory in order to simultaneously explain neutrino mass, mixing and the muon anomalous magnetic moment. We get sizeable contribution from the interaction of the new light gauge boson Zμτ of the $$ \mathrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ U 1 L μ − L τ symmetry with muons which can individually satisfy the current bounds on muon (g − 2) anomaly (∆aμ). The other positive contributions to ∆aμ come from the interactions of singly charged gauge bosons WL, WR with heavy neutral fermions and that of neutral CP-even scalars with muons. The interaction of WL with heavy neutrino is facilitated by inverse seesaw mechanism which allows large light-heavy neutrino mixing and explains neutrino mass in our model. CP-even scalars with mass around few hundreds GeV can also satisfy the entire current muon anomaly bound. The results show that the model gives a small but non-negligible contribution to ∆aμ thereby eliminating the entire deviation in theoretical prediction and experimental result of muon (g − 2) anomaly. We have briefly presented a comparative study for symmetric and asymmetric left-right symmetric model in context of various contribution to ∆aμ. We also discuss how the generation of neutrino mass is affected when left-right symmetry breaks down to Standard Model symmetry via various choices of scalars.

scholarly journals FERMION MASSES AND MIXINGS IN GAUGE THEORIES

2002 ◽  
Vol 17 (28) ◽  
pp. 3981-4006 ◽  
Author(s):  
D. FALCONE
Keyword(s):  
Gauge Symmetry ◽  
Standard Model ◽  
Neutrino Mass ◽  
Quark Mass ◽  
Gauge Theories ◽  
Neutrino Oscillations ◽  
Heavy Neutrino ◽  
Fermion Masses ◽  
Mass Matrices ◽  
The Standard Model

The recent evidence for neutrino oscillations stimulate us to discuss again the problem of fermion masses and mixings in gauge theories. In the standard model, several forms for quark mass matrices are equivalent. They become ansatze within most extensions of the standard model, where also relations between quark and lepton sectors may hold. In a seesaw framework, these relations can constrain the scale of heavy neutrino mass, which is often related to the scale of intermediate or unification gauge symmetry. As a consequence, two main scenarios arise. Hierarchies of masses and mixings may be explained by broken horizontal symmetries.

Limits on Heavy Neutrino Mass from Neutrinoless ββ Decays of 76 Ge and 82 Se

1992 ◽  
Vol 9 (9) ◽  
pp. 453-455
Author(s):  
Wu Huifang ◽  
Song Changliang
Keyword(s):  
Neutrino Mass ◽  
Heavy Neutrino
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