scholarly journals LEPTON MASS GENERATION AND FAMILY NUMBER VIOLATION MECHANISM IN THE SU(6)L⊗ U(1)Y MODEL

1998 ◽  
Vol 13 (32) ◽  
pp. 5557-5572 ◽  
Author(s):  
UMBERTO COTTI ◽  
RICARDO GAITÁN ◽  
A. HERNÁNDEZ-GALEANA ◽  
WILLIAM A. PONCE ◽  
ARNULFO ZEPEDA
Keyword(s):  
Experimental Data ◽  
Gauge Boson ◽  
Generation Mechanism ◽  
Mass Generation ◽  
Neutral Gauge Boson ◽  
Number Violation ◽  
Charged Leptons ◽  
The Masses ◽  
Lepton Family

Lepton family number violation processes arise in the SU(6) L⊗ U(1) Y model due to the presence of an extra neutral gauge boson, Z′, with family changing couplings, and due to the fact that this model demands the existence of heavy exotic leptons. The mixing of the standard Z with Z′ and the mixing of ordinary leptons with exotic ones induce together family changing couplings on the Z and therefore nonvanishing rates for lepton family number violation processes, such as [Formula: see text], [Formula: see text] and μ→eγ. Additional contributions to the processes μ→eγ and [Formula: see text] are induced from the mass generation mechanism. This last type of contributions may compete with the above one, depending on the masses of the scalars which participate in the diagrams which generate radiatively the masses of the charged leptons. Using the experimental data we compute some bounds for the mixings parameters and for the masses of the scalars.

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 Neutral Current in Reduced Minimal 3-3-1 Model

2014 ◽  
Vol 24 (2) ◽  
pp. 97 ◽  
Author(s):  
Vu Thi Ngoc Huyen ◽  
Hoang Ngoc Long ◽  
Tran Thanh Lam ◽  
Vo Quoc Phong
Keyword(s):  
Gauge Boson ◽  
Z Boson ◽  
Neutral Current ◽  
Decay Rates ◽  
Gauge Bosons ◽  
Mixing Angle ◽  
Neutral Gauge Boson ◽  
The Third ◽  
Model Based ◽  
The Masses

This work is devoted for gauge boson sector of the recentlyproposed model based on \(\mathrm{SU}(3)_C\otimes \mathrm{SU}(3)_L\otimes \mathrm{U}(1)_X\) group with minimal content of leptons andHiggses. The limits on the masses of the bilepton gauge bosons andon the mixing angle among the neutral ones are deduced. Using theFritzsch anzats on quark mixing, we show that the third family ofquarks should  be different from the first two. We obtain a lowerbound on mass of the new heavy neutral gauge boson as 4.032 TeV.Using data on branching decay rates of the \(Z\) boson, we  can fix the limit to the \(Z\) and $Z^\prime$ mixing angle\(\phi\) as \(-0.001\le\phi\le 0.0003\).

The masses of charged leptons and quarks from superposition self-interference of their Dirac fields

Open Physics ◽  
2011 ◽  
Vol 9 (1) ◽  
Author(s):  
Gerald Rosen
Keyword(s):  
Experimental Data ◽  
Free Field ◽  
Higgs Field ◽  
Pole Mass ◽  
Linear Superposition ◽  
Field Interaction ◽  
Dirac Fields ◽  
Charged Leptons ◽  
The Masses ◽  
O 10

AbstractWithout Higgs field interaction, accurate pole mass values are obtained for the charged leptons and quarks from a Z3-symmetric linear superposition self-interference of the Dirac fields in the effective free-field Lagrangian. The charged lepton and quark pole masses evidence the discrete Z3 symmetry, the theoretical-experimental deviations δm/m are $$ \mathcal{O} $$(10−5) for all three charged leptons, and the quark pole masses are in very satisfactory overall agreement with the experimental data.

COMMENT ON MASS GENERATION IN THE CHIRAL SCHWINGER MODEL

1991 ◽  
Vol 06 (18) ◽  
pp. 1657-1663
Author(s):  
THILO BERGER
Keyword(s):  
Gauge Theory ◽  
Gauge Boson ◽  
Invariant Theory ◽  
Low Energy ◽  
Generation Mechanism ◽  
Mass Generation ◽  
Gauge Invariant ◽  
Schwinger Model ◽  
Energy Version

The mass generation mechanism for the gauge boson in the chiral Schwinger model is compared with one in the vector Schwinger model. They do not differ substantially, and we argue that an anomalous chiral gauge theory should be seen generally as a special low-energy version of a gauge invariant theory.

GAUGE BOSON MASSES FROM FERMION MASSES?

1992 ◽  
Vol 07 (22) ◽  
pp. 1991-1996 ◽  
Author(s):  
R. FOOT ◽  
S. TITARD
Keyword(s):  
Gauge Boson ◽  
Z Boson ◽  
Heavy Fermions ◽  
Mass Matrix ◽  
Gauge Bosons ◽  
Fermion Masses ◽  
The Masses

We examine the possibility that the masses of the W and Z gauge bosons are induced radiatively from the masses of heavy fermions. From experiment we know that [Formula: see text][Formula: see text]. We point out that this relation can be naturally obtained if the W and Z boson masses are radiatively generated from heavy fermions which arise from a mass matrix which has large electroweak violating masses as well as very large electroweak invariant masses. Two examples of this are considered: The usual see-saw neutrino model and the SU(5)c/quark-lepton symmetric models.

scholarly journals Mass Reconstruction of MSSM Higgs Boson

2019 ◽  
Vol 64 (8) ◽  
pp. 714
Author(s):  
T. V. Obikhod ◽  
I. A. Petrenko
Keyword(s):  
Experimental Data ◽  
Higgs Boson ◽  
Standard Model ◽  
Top Quark ◽  
Computer Programs ◽  
Higgs Bosons ◽  
Associated Production ◽  
The Standard Model ◽  
The Masses ◽  
Mass Reconstruction

The problems of the Standard Model, as well as questions related to Higgs boson properties led to the need to model the ttH associated production and the Higgs boson decay to a top quark pair within the MSSM model. With the help of computer programs MadGraph, Pythia, and Delphes and using the latest kinematic cuts taken from experimental data obtained at the LHC, we have predicted the masses of MSSM Higgs bosons, A and H.

scholarly journals Mass generation in QCD — Oscillating quarks and gluons

2014 ◽  
Vol 29 (21) ◽  
pp. 1444015
Author(s):  
Peter Minkowski
Keyword(s):  
Harmonic Oscillator ◽  
Gauge Boson ◽  
Rotation Group ◽  
Broken Symmetry ◽  
Mass Generation ◽  
Symmetry Classification ◽  
Angular Momenta ◽  
Comparable Level ◽  
Space Rotation

The present lecture is devoted to embedding the approximate genuine harmonic oscillator structure of valence [Formula: see text] mesons and in more detail the qqq configurations for u, d, s flavored baryons in QCD for three light flavors of quark. It includes notes, preparing the counting of "oscillatory modes of N fl = 3 light quarks, u, d, s in baryons," using the [Formula: see text] broken symmetry classification, extended to the harmonic oscillator symmetry of 3 paired oscillator modes. [Formula: see text] stands for the space rotation group generated by the sum of the 3 individual angular momenta of quarks in their c.m. system. The oscillator extension to valence gauge boson states is not yet developed to a comparable level.

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.

STATISTICAL BAG MODEL FOR BARYONS AND THEIR RESONANCES

1990 ◽  
Vol 05 (30) ◽  
pp. 2537-2542 ◽  
Author(s):  
M. RAJASEKARAN ◽  
N. MEENAKUMARI ◽  
V. DEVANATHAN
Keyword(s):  
Experimental Data ◽  
Statistical Theory ◽  
Excited States ◽  
Degrees Of Freedom ◽  
Bag Model ◽  
Mit Bag Model ◽  
The Masses

Incorporating the effects of spin and isospin degrees of freedom in the MIT bag model, the masses of the ground and excited states of baryons are investigated in the framework of a statistical theory. The results are found to agree reasonably well with the experimental data.

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