CP-VIOLATION IN A LEFT-RIGHT SYMMETRIC HORIZONTAL FLAVOUR CHIRAL MODEL

1988 ◽  
Vol 03 (06) ◽  
pp. 607-614 ◽  
Author(s):  
KRISHNANATH BANDYOPADHYAY ◽  
ASIM K. RAY ◽  
AMITAVA RAYCHAUDHURI
Keyword(s):  
Cp Violation ◽  
Gauge Boson ◽  
Relative Phase ◽  
Vacuum Expectation ◽  
Chiral Model ◽  
Expectation Values ◽  
Higgs Vacuum ◽  
Boson Exchange ◽  
Text Model ◽  
Left And Right

A horizontal symmetric [Formula: see text] model is studied in the light of spontaneous CP-violation. The left- and right-handed Kobayashi-Maskawa matrices are real and the CP-nonconservation occurs through horizontal gauge boson exchange. To be in accord with experiment, the relative phase between two Higgs vacuum expectation values must be rather small.

SPONTANEOUS CP VIOLATION IN A TWO-GENERATION LEFT-RIGHT SYMMETRIC MODEL WITH TWO HIGGS BI-DOUBLETS

1992 ◽  
Vol 07 (34) ◽  
pp. 3179-3186 ◽  
Author(s):  
AMBAR GHOSAL ◽  
ASIM K. RAY ◽  
SASWATI SARKAR
Keyword(s):  
Cp Violation ◽  
Relative Phase ◽  
Vacuum Expectation ◽  
Discrete Symmetry ◽  
Tree Level ◽  
Model Parameters ◽  
Symmetric Model ◽  
Expectation Values ◽  
Flavor Changing ◽  
Experimental Values

We discuss a two-generation left-right symmetric model with two Higgs bi-doublets and a discrete symmetry to show that spontaneous CP violation arises as a result of soft breaking of the discrete symmetry. The contributions to the CP violation parameter ε in the [Formula: see text] transition come from the box diagrams due to WL-WR exchanges as well as from the mixing of the real and imaginary parts of the flavor changing neutral Higgs at the tree level and both contributions depend on the relative phase difference between the vacuum expectation values (vevs) of the relevant neutral Higgs scalars. Other CP violating effects in the model are consistent with their experimental values for the appropriate choice of the model parameters. The extension of the model to the realistic case of three generations of fermions does not appreciably change the phenomenology of the model.

scholarly journals A NEW ANSATZ FOR QUARK AND LEPTON MASS MATRICES

1992 ◽  
Vol 07 (26) ◽  
pp. 2429-2435 ◽  
Author(s):  
GIAN F. GIUDICE
Keyword(s):  
Vacuum Expectation ◽  
Cabibbo Angle ◽  
Expectation Values ◽  
Higgs Vacuum ◽  
Grand Unified Theories ◽  
Fermion Masses ◽  
Mass Matrices ◽  
Unified Theories ◽  
Free Parameters ◽  
Good Agreement

A new ansatz for quark and lepton mass matrices is proposed in the context of supersymmetric grand unified theories. The 13 parameters describing fermion masses and mixings are determined in terms of only 6 free parameters, allowing 7 testable predictions. The values of Vus, Vcb, Vub, mu, md, ms and mb are then predicted as a function of the 3 charged lepton masses, mc, mt and tan β, the ratio of Higgs vacuum expectation values. In particular the Cabibbo angle and ms/md are determined in terms of only lepton masses. All predictions are in very good agreement with experiments.

scholarly journals OBSERVABLES IN LOW-ENERGY SUPERSTRING MODELS

1986 ◽  
Vol 01 (01) ◽  
pp. 57-69 ◽  
Author(s):  
JOHN ELLIS ◽  
K. ENQVIST ◽  
D.V. NANOPOULOS ◽  
F. ZWIRNER
Keyword(s):  
Gauge Boson ◽  
Vacuum Expectation ◽  
Low Energy ◽  
Effective Theory ◽  
Expectation Values ◽  
Neutral Gauge Boson ◽  
Dynamical Generation ◽  
Gauge Hierarchy ◽  
Sneutrino Mass ◽  
The Masses

We compile phenomenological constraints on the minimal low-energy effective theory which can be obtained from the superstring by Calabi-Yau compactification. Mixing with the single additional neutral gauge boson in this model reduces the mass of the conventional Z0, Field vacuum expectation values are constrained by the experimental upper bound on this shift. Then, requiring the sneutrino mass squared to be positive constrains the scale of supersymmetry breaking more than do lower bounds on the masses of new charged particles and of sparticles. More model-dependent constraints follow from the “naturalness” requirement that observables do not depend sensitively on input parameters. We find a preference for the second neutral gauge boson to weigh ≲320 GeV, [Formula: see text] GeV and [Formula: see text] GeV. Dynamical generation of the gauge hierarchy is possible if mt≲70 GeV, with lower values of mt being favoured.

scholarly journals Gauge Bosons in the 3-3-1 Model with Three Neutrino Singlets

2015 ◽  
Vol 25 (3) ◽  
pp. 227
Author(s):  
Hoang Ngoc Long ◽  
Lam Phu An Huy ◽  
Tran Thanh Thuy ◽  
Ly Thi Tu Tran ◽  
Vu Thi Hoang Yen
Keyword(s):  
Lower Bound ◽  
Decay Width ◽  
Gauge Boson ◽  
W Boson ◽  
Mass Matrix ◽  
Vacuum Expectation ◽  
Expectation Values ◽  
Gauge Bosons ◽  
Proposed Model ◽  
Higgs Fields

We show that the mass matrix of electrically neutral gauge bosons in the recent proposed  model based on \(\mathrm{SU}(3)_C\otimes \mathrm{SU}(3)_L\otimes \mathrm{U}(1)_X\) group with three neutrino singlets [9] has two exact eigenvalues and corresponding eigenvectors. Hence the neutral non-Hermitian gauge boson \(X^0_\mu\) is properly determined.With extra vacuum expectation values of the Higgs fields, there are mixings among charged gauge bosons \(W^\pm\) and \(Y^\pm\) as well as amongneutral gauge bosons \(Z, Z'\) and \(X^0\). From the $W$ boson decay width, we get lower bound on  scale of the model about few TeVs.

scholarly journals VORTEX SOLUTION IN A MULTI-HIGGS SYSTEM AND ITS PHYSICAL IMPLICATION

1993 ◽  
Vol 08 (28) ◽  
pp. 2649-2655
Author(s):  
HOSEONG LA
Keyword(s):  
Vacuum Expectation ◽  
Higgs Potential ◽  
Expectation Values ◽  
Specific Relation ◽  
Higgs Vacuum ◽  
Physical Implication ◽  
Vortex Solution ◽  
Vortex Solutions

Classical vortex solutions in (1 + 2)-dimensional multi-Higgs systems are studied. In particular the existence of such a solution requires equal characteristic lengths and a specific relation between the ratio of the two Higgs vacuum expectation values and the couplings in the Higgs potential, if λ3 ≠ 0.

scholarly journals The EconomicalSU(3)C⊗SU(3)L⊗U(1)XModel

2008 ◽  
Vol 2008 ◽  
pp. 1-74 ◽  
Author(s):  
P. V. Dong ◽  
H. N. Long
Keyword(s):  
Gauge Boson ◽  
Vacuum Expectation ◽  
Mass Splitting ◽  
Lepton Number ◽  
Expectation Values ◽  
Gauge Bosons ◽  
Neutral Gauge Boson ◽  
Goldstone Bosons ◽  
The Standard Model ◽  
Scalar Sector

TheSU(3)C⊗SU(3)L⊗U(1)Xgauge model with minimal scalar sector, two Higgs triplets, is presented in detail. One of the vacuum expectation valuesuis a source of lepton-number violations and a reason for mixing among charged gauge bosons—the standard modelW±and the bilepton gauge bosonsY±, as well as among the neutral non-Hermitian bileptonX0and neutral gauge bosons—theZand the newZ′. An exact diagonalization of the neutral gauge boson sector is derived, and bilepton mass splitting is also given. Because of these mixings, the lepton-number violating interactions exist in both charged and neutral gauge boson sectors. Constraints on vacuum expectation values of the model are estimated andu≃𝒪(1)GeV,v≃vweak=246GeV, andω≃𝒪(1)TeV. In this model, there are three physical scalars, two neutral and one charged, and eight Goldstone bosons—the needed number for massive gauge bosons. The minimal scalar sector can provide all fermions including quarks and neutrinos consistent masses in which some of them require one-loop radiative corrections.

scholarly journals A NEW HYPOTHESIS ON THE ORIGIN OF THE THREE GENERATIONS

1996 ◽  
Vol 11 (04) ◽  
pp. 339-347 ◽  
Author(s):  
S.D. BASS ◽  
A.W. THOMAS
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Gauge Boson ◽  
Quark Sector ◽  
Three Generations ◽  
The Standard Model ◽  
Left And Right ◽  
The Right ◽  
New Hypothesis

We suggest that the standard model may undergo a supercritical transition near the Landau scale, where the U(1) gauge-boson couples to the left- and right-handed states of any given fermion with different charges. This scenario naturally gives rise to three generations of fermion, corresponding to the three critical scales for the right-right, right-left and left-left fermion interactions going supercritical, as well as CP-violation in the quark sector.

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.

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