scholarly journals IMPLEMENTING CANONICAL SEESAW MECHANISM IN THE EXACT SOLUTION OF A 3-3-1 GAUGE MODEL WITHOUT EXOTIC ELECTRIC CHARGES

2006 ◽  
Vol 21 (34) ◽  
pp. 2591-2597 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Exact Solution ◽  
Dark Matter ◽  
Mass Spectrum ◽  
Main Parameter ◽  
Higgs Sector ◽  
Boson Mass ◽  
Gauge Model ◽  
Mass Source ◽  
Seesaw Mechanism ◽  
Small Alteration

We prove that, even at a low TeV scale, the canonical seesaw mechanism can be naturally implemented in the exact solution of a particular 3-3-1 gauge model, since a very small alteration ε in the parameter matrix of the Higgs sector is taken into account. Therefore, this new parameter can act as an appropriate mass source for neutrinos, while, due to the main parameter a, all the previously achieved results in the exact solution of the model are recovered. Moreover, this mathematical artifice does separate the boson mass spectrum from the neutrino mass issue, hence giving more flexibility in tuning the model. Possible phenomenological results and their implications — such as dark matter plausible candidates that can occur — are also briefly discussed.

scholarly journals NEUTRINO MASS AS A CONSEQUENCE OF THE EXACT SOLUTION OF 3-3-1 GAUGE MODELS WITHOUT EXOTIC ELECTRIC CHARGES

2006 ◽  
Vol 21 (15) ◽  
pp. 1203-1217 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Exact Solution ◽  
Mass Spectrum ◽  
Higgs Sector ◽  
Original Method ◽  
Boson Mass ◽  
Gauge Models ◽  
Left Handed ◽  
Order Of Magnitude ◽  
Breaking Mechanism ◽  
Straightforward Consequence

The unjustly neglected method of exactly solving generalized electroweak models — with an original spontaneous symmetry breaking mechanism based on the gauge group SU (n)L⊗ U (1)Y — is applied here to a particular class of chiral 3-3-1 models. This procedure enables us, without resorting to any approximation, to express the boson mass spectrum and charges of the particles involved therein as a straightforward consequence of both a proper parametrization of the Higgs sector and a new generalized Weinberg transformation. We prove that the resulting values can accommodate the experimental ones just by tuning a sole parameter. Furthermore, if we take into consideration both the left-handed and right-handed components of the neutrino (included in a lepton triplet along with their corresponding left-handed charged partner), then we are in the position to propose an original method for the neutrino to acquire a very small but nonzero mass without spoiling the previously achieved results in the exact solution of the model. In order to be compatible with the existing phenomenological data, the range of that sole parameter imposes a large order of magnitude for the vev〈ϕ〉~104 TeV in our method. Consequently, the new bosons of the model have to be very massive.

scholarly journals Flipped U(1) extended standard model and Majorana dark matter

2020 ◽  
Vol 80 (12) ◽  
Author(s):  
Cao H. Nam
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Boson Mass ◽  
Type I ◽  
Seesaw Mechanism ◽  
Gauge Symmetries ◽  
The Standard Model ◽  
Gauge Boson Mass ◽  
The Right ◽  
Relic Abundance

AbstractWe propose a general flavor-independent extension of the Standard Model (SM) with the minimal particle content, based on the symmetry $$SU(3)_C\times SU(2)_L\times U(1)_{Y'}\times U(1)_X\times Z_2$$ S U ( 3 ) C × S U ( 2 ) L × U ( 1 ) Y ′ × U ( 1 ) X × Z 2 . In this scenario, the charge operator is identified in terms of the charges of two U(1) gauge symmetries. The light neutrino masses are generated via Type-I seesaw mechanism only with two heavy right-handed neutrinos acquiring their Majorana masses through the $$U(1)_{Y'}\times U(1)_X$$ U ( 1 ) Y ′ × U ( 1 ) X symmetry breaking. We study various experimental constraints on the parameters of the model and investigate the phenomenology of the right-handed neutrino dark matter (DM) candidate assigned a $$Z_2$$ Z 2 -odd parity. We find that the most important constraints are the observed DM relic abundance, the current LHC limits, and the ambiguity of the SM neutral gauge boson mass.

scholarly journals Embedding cosmological inflation, axion dark matter and seesaw mechanism in a 3-3-1 gauge model

2017 ◽  
Vol 771 ◽  
pp. 199-205 ◽  
Author(s):  
J.G. Ferreira ◽  
C.A. de S. Pires ◽  
J.G. Rodrigues ◽  
P.S. Rodrigues da Silva
Keyword(s):  
Dark Matter ◽  
Gauge Model ◽  
Seesaw Mechanism ◽  
Cosmological Inflation

scholarly journals SU(n) ⊗ U(1)c Gauge Models with Spontaneous Symmetry Breaking

1997 ◽  
Vol 12 (08) ◽  
pp. 1483-1509 ◽  
Author(s):  
Ion I. Cotăescu
Keyword(s):  
Exact Solution ◽  
Mass Spectrum ◽  
Symmetry Breaking ◽  
Higgs Mechanism ◽  
Boson Mass ◽  
Coupling Coefficients ◽  
Yukawa Couplings ◽  
Gauge Models ◽  
The Standard Model ◽  
General Method

A possible generalization of the technique of the standard model to SU (n) ⊗ U (1) gauge models is proposed. A special Higgs mechanism and a new kind of Yukawa couplings in unitary gauge are introduced. These allow us to obtain a general method for deriving boson mass spectrum and coupling coefficients which will be used to find an exact solution of the Frampton–Pisano–Pleitez three-generation SU (3) ⊗ U (1) model.

scholarly journals Dark matter as the origin of neutrino mass in the inverse seesaw mechanism

2021 ◽  
pp. 136609
Author(s):  
Sanjoy Mandal ◽  
Nicolás Rojas ◽  
Rahul Srivastava ◽  
José W.F. Valle
Keyword(s):  
Dark Matter ◽  
Neutrino Mass ◽  
Seesaw Mechanism

scholarly journals Minimal scoto-seesaw mechanism with spontaneous CP violation

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
D. M. Barreiros ◽  
F. R. Joaquim ◽  
R. Srivastava ◽  
J. W. F. Valle
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Discrete Symmetry ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Cosmological Observations ◽  
Scalar Singlet

Abstract We propose simple scoto-seesaw models to account for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $$ {\mathcal{Z}}_8 $$ Z 8 discrete symmetry, broken to a residual $$ {\mathcal{Z}}_2 $$ Z 2 subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed $$ {\mathcal{Z}}_8 $$ Z 8 symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments, so that normal-ordered neutrino masses can be cornered by cosmological observations and neutrinoless double beta decay experiments.

scholarly journals BOSON MASS SPECTRUM INSU(4)L⊗U(1)YMODEL WITH EXOTIC ELECTRIC CHARGES

2009 ◽  
Vol 24 (22) ◽  
pp. 1731-1742 ◽  
Author(s):  
ADRIAN PALCU
Keyword(s):  
Mass Spectrum ◽  
Mass Scale ◽  
Boson Mass ◽  
Gauge Models

The boson mass spectrum of the electroweak SU (4)L⊗ U (1)Ymodel with exotic electric charges is investigated by using the algebraical approach supplied by the method of solving gauge models with high symmetries. Our approach predicts for the boson sector a one-parameter mass scale to be tuned in order to match the data obtained at LHC, LEP, CDF.

scholarly journals Flavour effects in gravitational leptogenesis

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Rome Samanta ◽  
Satyabrata Datta
Keyword(s):  
Mass Spectrum ◽  
Chemical Potential ◽  
Mass Scale ◽  
Lepton Number ◽  
Type I ◽  
Lepton Asymmetry ◽  
Seesaw Mechanism ◽  
Set Up ◽  
The Right ◽  
Lepton Number Violating

Abstract Within the Type-I seesaw mechanism, quantum effects of the right-handed (RH) neutrinos in the gravitational background lead to an asymmetric propagation of lepton and anti-leptons which induces a Ricci scalar and neutrino Dirac-Yukawa coupling dependent chemical potential and therefore a lepton asymmetry in equilibrium. At high temperature, lepton number violating scattering processes try to maintain a dynamically generated lepton asymmetry in equilibrium. However, when the temperature drops down, the interactions become weaker, and the asymmetry freezes out. The frozen out asymmetry can act as a pre-existing asymmetry prior to the standard Fukugita-Yanagida leptogenesis phase (Ti ∼ Mi, where Mi is the mass of ith RH neutrino). It is then natural to consider the viability of gravitational leptogenesis for a given RH mass spectrum which is not consistent with successful leptogenesis from decays. Primary threat to this gravity-induced lepton asymmetry to be able to successfully reproduce the observed baryon-to-photon ratio is the lepton number violating washout processes at Ti ∼ Mi. In a minimal seesaw set up with two RH neutrinos, these washout processes are strong enough to erase a pre-existing asymmetry of significant magnitude. We show that when effects of flavour on the washout processes are taken into account, the mechanism opens up the possibility of successful leptogenesis (gravitational) for a mass spectrum M2 » 109GeV » M1 with M1 ≳ 6.3 × 106 GeV. We then briefly discuss how, in general, the mechanism leaves its imprints on the low energy CP phases and absolute light neutrino mass scale.

scholarly journals Vector Boson Mass Spectrum from Extra Dimension

2013 ◽  
Vol 04 (07) ◽  
pp. 991-993 ◽  
Author(s):  
Dao Vong Duc ◽  
Nguyen Mong Giao
Keyword(s):  
Mass Spectrum ◽  
Extra Dimension ◽  
Vector Boson ◽  
Boson Mass

scholarly journals A SCREENING MECHANISM FOR EXTRA W AND Z GAUGE BOSONS

2000 ◽  
Vol 15 (21) ◽  
pp. 3369-3394
Author(s):  
JOAQUIM MATIAS ◽  
ALESSANDRO VICINI
Keyword(s):  
Mass Spectrum ◽  
Gauge Boson ◽  
Extra Dimensions ◽  
Boson Mass ◽  
Gauge Bosons ◽  
Gauge Boson Mass ◽  
Kaluza Klein

We generalize a previous construction of a fermiophobic model to the case of more than one extra W and Z gauge bosons. We focus in particular on the existence of screening configurations and their implication on the gauge boson mass spectrum. One of these configurations allows for the existence of a set of relatively light new gauge bosons, without violation of the quite restrictive bounds coming from the ρ NC parameter. The links with Bess and degenerate Bess models are also discussed. Also the signal given here by this more traditional gauge extension of the SM could help to disentangle it from the towers of Kaluza–Klein states over W and Z gauge bosons in extra dimensions.

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