scholarly journals Gauge Boson Mixing in the 3-3-1 Models with Discrete Symmetries

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
P. V. Dong ◽  
V. T. N. Huyen ◽  
H. N. Long ◽  
H. V. Thuy
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Discrete Symmetries ◽  
Lepton Number ◽  
Neutrino Mixing ◽  
Gauge Bosons ◽  
Neutral Gauge Boson ◽  
Neutral Scalar ◽  
The Standard Model ◽  
Lepton Number Violating

The mixing among gauge bosons in the 3-3-1 models with the discrete symmetries is investigated. To get tribimaximal neutrino mixing, we have to introduce sextets containing neutral scalar components with lepton numberL=1,2. Assignation of VEVs to these fields leads to the mixing of the new gauge bosons and those in the standard model. The mixing in the charged gauge bosons leads to the lepton number violating interactions of theWboson. The same situation happens in the neutral gauge boson sector.

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 Constraints on the U(1)L gauge boson in a wide mass range

2016 ◽  
Vol 31 (11) ◽  
pp. 1650059 ◽  
Author(s):  
Yu Seon Jeong ◽  
C. S. Kim ◽  
Hye-Sung Lee
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Mass Range ◽  
Small Mass ◽  
Low Energy ◽  
Gauge Bosons ◽  
Dark Photon ◽  
The Standard Model ◽  
Similarities And Differences ◽  
New Discovery

There is a growing interest for the search of new light gauge bosons. The small mass of a new boson can turn various kinds of low-energy experiments to a new discovery machine, depending on their couplings to the Standard Model particles. It is important to understand the properties of each type of gauge boson and their current constraints for a given mass. While the dark photon (which couples to the electric charges) and the [Formula: see text] gauge boson have been well studied in an extensive mass range, the [Formula: see text] gauge boson has not been fully investigated yet. We consider the gauge boson of the [Formula: see text] in a wide mass range [Formula: see text] and investigate the constraints on its coupling from various experiments, discussing the similarities and differences from the dark photon and the [Formula: see text] gauge boson.

CONSTRAINTS ON THE SU(5)C × SU(2)L × U(1)′ MODEL FROM LEP DATA

1999 ◽  
Vol 14 (07) ◽  
pp. 1049-1060 ◽  
Author(s):  
SASWATI SARKAR ◽  
ASIM K. RAY ◽  
UTPAL SARKAR
Keyword(s):  
Lower Bound ◽  
Standard Model ◽  
Gauge Boson ◽  
Z Boson ◽  
Boson Mass ◽  
Precision Measurements ◽  
Tree Level ◽  
Mixing Angle ◽  
Neutral Gauge Boson ◽  
The Standard Model

We have determined constraints on the SU (5)C × SU (2)L × U (1)′ model in terms of the extra mixing angle ϕ in the neutral gauge boson sector and ΔρM, the deviation of the Standard Model ρ parameter from unity at the tree level, using the recent precision measurements at LEP on electroweak parameters at the Z peak. The lower bound of the extra Z′ boson mass has also been determined.

scholarly journals BARYON AND LEPTON NUMBER VIOLATION WITH SCALAR BILINEARS

2002 ◽  
Vol 17 (33) ◽  
pp. 2221-2228 ◽  
Author(s):  
H. V. KLAPDOR-KLEINGROTHAUS ◽  
ERNEST MA ◽  
UTPAL SARKAR
Keyword(s):  
Standard Model ◽  
Beta Decay ◽  
Neutrinoless Double Beta Decay ◽  
Proton Decay ◽  
Lepton Number ◽  
Double Beta Decay ◽  
Lepton Number Violation ◽  
The Standard Model ◽  
Number Violation ◽  
Lepton Number Violating

We consider all possible scalar bilinears, which couple to two fermions of the standard model. The various baryon and lepton number violating couplings allowed by these exotic scalars are studied. We then discuss which are constrained by limits on proton decay (to a lepton and a meson as well as to three leptons), neutron–antineutron oscillations, and neutrinoless double beta decay.

scholarly journals Non-Standard neutrino interactions and neutral gauge bosons

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Julian Heeck ◽  
Manfred Lindner ◽  
Werner Rodejohann ◽  
Stefan Vogl
Keyword(s):  
Standard Model ◽  
Gauge Boson ◽  
Relative Importance ◽  
Linear Combinations ◽  
Gauge Bosons ◽  
Neutrino Interactions ◽  
Long Baseline ◽  
The Standard Model ◽  
Nucleus Scattering ◽  
Lepton Family

We investigate Non-Standard Neutrino Interactions (NSI) arising from a flavor-sensitive Z'Z′ boson of a new U(1)'U(1)′ symmetry. We compare the limits from neutrino oscillations, coherent elastic neutrino–nucleus scattering, and Z'Z′ searches at different beam and collider experiments for a variety of straightforward anomaly-free U(1)'U(1)′ models generated by linear combinations of B-LB−L and lepton-family-number differences L_\alpha-L_\betaLα−Lβ. Depending on the flavor structure of those models it is easily possible to avoid NSI signals in long-baseline neutrino oscillation experiments or change the relative importance of the various experimental searches. We also point out that kinetic ZZ–Z'Z′ mixing gives vanishing NSI in long-baseline experiments if a direct coupling between the U(1)'U(1)′ gauge boson and matter is absent. In contrast, ZZ–Z'Z′ mass mixing generates such NSI, which in turn means that there is a Higgs multiplet charged under both the Standard Model and the new U(1)'U(1)′ symmetry.

scholarly journals On the role of leptonic CPV phases in cLFV observables

2021 ◽  
Vol 81 (11) ◽  
Author(s):  
A. Abada ◽  
J. Kriewald ◽  
A. M. Teixeira
Keyword(s):  
Standard Model ◽  
Crucial Role ◽  
Charged Lepton ◽  
Lepton Number ◽  
Majorana Fermions ◽  
Future Observation ◽  
The Standard Model ◽  
Lepton Flavour ◽  
Lepton Number Violating

AbstractIn extensions of the standard model by Majorana fermions, the presence of additional CP violating phases has been shown to play a crucial role in lepton number violating processes. In this work we show that (Dirac and Majorana) CP violating phases can also lead to important effects in charged lepton flavour violating (cLFV) transitions and decays, in some cases with a significant impact for the predicted rates of cLFV observables. We conduct a thorough exploration of these effects in several cLFV observables, and discuss the implications for future observation. We emphasise how the presence of leptonic CP violating phases might lead to modified cLFV rates, and to a possible loss of correlation between cLFV observables.

scholarly journals Nonperturbative effects in the Standard Model with gauged 1-form symmetry

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Mohamed M. Anber ◽  
Erich Poppitz
Keyword(s):  
Standard Model ◽  
Nonperturbative Effects ◽  
Gauge Group ◽  
Topological Charge ◽  
Lepton Number ◽  
Global Symmetry ◽  
Weak Scale ◽  
Instanton Contribution ◽  
The Standard Model ◽  
Lepton Number Violating

Abstract We study the Standard Model with gauged $$ {\mathrm{\mathbb{Z}}}_{N=2,3,6}^{(1)} $$ ℤ N = 2 , 3 , 6 1 subgroups of its $$ {\mathrm{\mathbb{Z}}}_6^{(1)} $$ ℤ 6 1 1-form global symmetry, making the gauge group $$ \frac{\mathrm{SU}(3)\times \mathrm{SU}(2)\times \mathrm{U}(1)}{{\mathrm{\mathbb{Z}}}_N} $$ SU 3 × SU 2 × U 1 ℤ N . We show that, on a finite $$ {\mathbbm{T}}^3 $$ T 3 , there are self-dual instantons of fractional topological charge. They mediate baryon- and lepton-number violating processes. We compare their amplitudes to the ones due to the usual BPST-instantons. We find that the small hypercharge coupling suppresses the fractional-instanton contribution, unless the torus size is taken sub-Planckian, or extra matter is added above the weak scale. We also discuss these results in light of the cosmological bounds on the torus size.

scholarly journals TRILINEAR NEUTRAL GAUGE BOSON COUPLINGS

2001 ◽  
Vol 16 (30) ◽  
pp. 4891-4909 ◽  
Author(s):  
DEBAJYOTI CHOUDHURY ◽  
SUKANTA DUTTA ◽  
SUBHENDU RAKSHIT ◽  
SAURABH RINDANI
Keyword(s):  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Minimal Supersymmetric Standard Model ◽  
Gauge Boson ◽  
Form Factors ◽  
Neutral Gauge Boson ◽  
The Standard Model ◽  
Vector Bosons ◽  
Gauge Boson Couplings

We study the CP even trilinear neutral gauge boson vertices at one-loop in the context of the Standard Model and the Minimal Supersymmetric Standard Model, assuming two of the vector bosons are on-shell. We also study the changes in the form-factors when these two bosons are off-shell.

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