scholarly journals Type-II neutrino seesaw mechanism extension of NMSSM from SUSY breaking mechanisms

2020 ◽  
Vol 80 (8) ◽  
Author(s):  
Zhuang Li ◽  
Fei Wang
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Susy Breaking ◽  
Low Energy ◽  
Precision Measurements ◽  
Type Ii ◽  
Mass Generation ◽  
Seesaw Mechanism ◽  
Neutrino Mass Generation ◽  
Messenger Scale

Abstract We propose to accommodate economically the type-II neutrino seesaw mechanism in (G)NMSSM from GMSB and AMSB, respectively. The heavy triplets within neutrino seesaw mechanism are identified to be the messengers. Therefore, the $$\mu $$μ-problem, the neutrino mass generation, LFV as well the soft SUSY breaking parameters can be economically combined in a non-trivial way. General features of such extensions are discussed. The type-II neutrino seesaw-specific interactions can give additional Yukawa deflection contributions to the soft SUSY breaking parameters of NMSSM, which are indispensable to realize successful EWSB and accommodate the 125 GeV Higgs. Relevant numerical results, including the constraints of dark matter and possible LFV processes $$l_i\rightarrow l_j \gamma $$li→ljγ etc, are also given. We find that our economical type-II neutrino seesaw mechanism extension of NMSSM from AMSB or GMSB can lead to realistic low energy NMSSM spectrum, both admitting the 125 GeV Higgs as the lightest CP-even scalar. The possibility of the 125 GeV Higgs being the next-to-lightest CP-even scalar in GMSB-type scenario is ruled out by the constraints from EWSB, collider and precision measurements. The possibility of the 125 GeV Higgs being the next-to-lightest CP-even scalar in AMSB-type scenario is ruled out by dark matter direct detection experiments. Possible constraints from LFV processes $$l_i\rightarrow l_j \gamma $$li→ljγ can give an upper bound for the messenger scale.

scholarly journals Phenomenology of scotogenic scalar dark matter

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Ivania M. Ávila ◽  
Valentina De Romeri ◽  
Laura Duarte ◽  
José W. F. Valle
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Mass Range ◽  
Indirect Detection ◽  
Mass Generation ◽  
Dark Matter Mass ◽  
Direct And Indirect Detection ◽  
Neutrino Mass Generation ◽  
Relic Abundance ◽  
Near Future

AbstractWe reexamine the minimal Singlet $$+$$ + Triplet Scotogenic Model, where dark matter is the mediator of neutrino mass generation. We assume it to be a scalar WIMP, whose stability follows from the same $${\mathbb {Z}}_{2}$$ Z 2 symmetry that leads to the radiative origin of neutrino masses. The scheme is the minimal one that allows for solar and atmospheric mass scales to be generated. We perform a full numerical analysis of the signatures expected at dark matter as well as collider experiments. We identify parameter regions where dark matter predictions agree with theoretical and experimental constraints, such as neutrino oscillations, Higgs data, dark matter relic abundance and direct detection searches. We also present forecasts for near future direct and indirect detection experiments. These will further probe the parameter space. Finally, we explore collider signatures associated with the mono-jet channel at the LHC, highlighting the existence of a viable light dark matter mass range.

scholarly journals Low scale leptogenesis in a model with promising CP structure

2021 ◽  
Vol 81 (4) ◽  
Author(s):  
Daijiro Suematsu
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Resonance Effect ◽  
Low Energy ◽  
Simple Extension ◽  
Dark Matter Candidate ◽  
Mass Generation ◽  
Leptonic Sector ◽  
The Standard Model ◽  
Neutrino Mass Generation

AbstractWe consider a simple extension of the standard model, which could give a solution to itsCPissues through both the Peccei–Quinn mechanism and the Nelson–Barr mechanism. Its low energy effective model coincides with the scotogenic model in the leptonic sector. Although leptogenesis is known not to work well at lower reheating temperature than$$10^9$$109 GeV in simple seesaw and scotogenic frameworks, such low reheating temperature could be consistent with both neutrino mass generation and thermal leptogenesis via newly introduced fields without referring to the resonance effect. An alternative dark matter candidate to axion is prepared as an indispensable ingredient of the model.

scholarly journals Investigating two heavy neutral leptons neutrino seesaw mechanism at SHiP

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.

scholarly journals Neutrino mass generation with extra right-handed fields in a Dirac scenario via the type-I seesaw mechanism

2014 ◽  
Vol 29 (40) ◽  
pp. 1450212 ◽  
Author(s):  
Ernesto A. Matute
Keyword(s):  
Small Mass ◽  
Type I ◽  
High Scale ◽  
Mass Generation ◽  
Seesaw Mechanism ◽  
Scale Type ◽  
Left Handed ◽  
Natural Choice ◽  
The Standard Model ◽  
Neutrino Mass Generation

An extension of the Standard Model (SM) is studied in which two right-handed (RH) neutrinos per generation are incorporated, but considering the hypothesis of the symmetry of lepton and quark contents in order to deprive the number of RH neutrinos of freedom, generate Dirac neutrinos and accommodate naturally tiny values for their masses. The high scale type-I seesaw regime is applied to the first, ordinary RH neutrino, whereas a low scale pseudo-Dirac scenario is used for the second, adulterant RH neutrino, implying that the first RH neutrino decouples at the high scale, while the second RH neutrino survives down to the low scale to pair off in a Dirac-like form with the corresponding left-handed (LH) neutrino. The small mass and couplings of this extra RH neutrino are explained by means of the statement of the symmetry of fermionic content, only regarded as a guideline to the natural choice of parameters since it is not a proper symmetry in the Lagrangian.

scholarly journals Searching for secluded dark matter via direct detection of recoiling nuclei as well as low energy electrons

2010 ◽  
Vol 826 (1-2) ◽  
pp. 148-173 ◽  
Author(s):  
A. Dedes ◽  
I. Giomataris ◽  
K. Suxho ◽  
J.D. Vergados
Keyword(s):  
Dark Matter ◽  
Direct Detection ◽  
Low Energy ◽  
Low Energy Electrons

scholarly journals High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and LFV Decays in SU(‎5)

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
M. K. Parida ◽  
Rajesh Satpathy
Keyword(s):  
Beta Decay ◽  
Neutrino Mass ◽  
Double Beta Decay ◽  
Type I ◽  
Mass Hierarchy ◽  
Type Ii ◽  
Inverted Hierarchy ◽  
Mass Generation ◽  
Neutrino Mass Generation ◽  
Physical Phenomena

Very recently novel implementation of type-II seesaw mechanism for neutrino mass has been proposed in SU(5) grand unified theory with a number of desirable new physical phenomena beyond the standard model. Introducing heavy right-handed neutrinos and extra fermion singlets, in this work we show how the type-I seesaw cancellation mechanism works in this SU(5) framework. Besides predicting verifiable LFV decays, we further show that the model predicts dominant double beta decay with normal hierarchy or inverted hierarchy of active light neutrino masses in concordance with cosmological bound. In addition a novel right-handed neutrino mass generation mechanism, independent of type-II seesaw predicted mass hierarchy, is suggested in this work.

NEUTRINO MIXING, LEPTONIC CP VIOLATION, THE SEESAW MECHANISM AND BEYOND

2010 ◽  
Vol 25 (23) ◽  
pp. 4325-4337 ◽  
Author(s):  
S. T. PETCOV
Keyword(s):  
Cp Violation ◽  
Neutrino Mass ◽  
Baryon Asymmetry ◽  
Neutrino Mixing ◽  
Mass Generation ◽  
Seesaw Mechanism ◽  
Mixing Matrix ◽  
Neutrino Mass Generation ◽  
The Universe

The phenomenology of 3-neutrino mixing and of the related Dirac and Majorana leptonic CP violation is reviewed. The leptogenesis scenario of generation of the baryon asymmetry of the Universe, which is based on the see-saw mechanism of neutrino mass generation, is considered. The results showing that the CP violation necessary for the generation of the baryon asymmetry of the Universe in leptogenesis can be due exclusively to the Dirac and/or Majorana CP-violating phase(s) in the neutrino mixing matrix U are briefly reviewed.

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