Phenomenology of and Beyond the Standard Electroweak Model

1990 ◽  
pp. 1-37
Author(s):  
A. Bartl ◽  
H. Pietschmann ◽  
H. Stremnitzer
Keyword(s):  
Electroweak Model

ERRATUM: "THE SU(2) ⊗ U(1) ELECTROWEAK MODEL BASED ON THE NONLINEARLY REALIZED GAUGE GROUP"

2012 ◽  
Vol 27 (07) ◽  
pp. 1292004 ◽  
Author(s):  
D. BETTINELLI ◽  
R. FERRARI ◽  
A. QUADRI
Keyword(s):  
Gauge Group ◽  
Model Based ◽  
Electroweak Model

scholarly journals ON THE KALUZA–KLEIN GEOMETRIZATION OF THE ELECTROWEAK MODEL WITHIN A GAUGE THEORY OF THE FIVE-DIMENSIONAL LORENTZ GROUP

2006 ◽  
Vol 15 (05) ◽  
pp. 717-736
Author(s):  
ORCHIDEA MARIA LECIAN ◽  
GIOVANNI MONTANI
Keyword(s):  
Gauge Theory ◽  
Lorentz Group ◽  
Lagrangian Density ◽  
Gauge Fields ◽  
Normalization Factor ◽  
Current Term ◽  
Electroweak Model ◽  
Kaluza Klein

The geometrization of the Electroweak Model is achieved in a five-dimensional Riemann–Cartan framework. Matter spinorial fields are extended to 5 dimensions by the choice of a proper dependence on the extracoordinate and of a normalization factor. U (1) weak hypercharge gauge fields are obtained from a Kaluza–Klein scheme, while the tetradic projections of the extradimensional contortion fields are interpreted as SU (2) weak isospin gauge fields. SU (2) generators are derived by the identification of the weak isospin current to the extradimensional current term in the Lagrangian density of the local Lorentz group. The geometrized U (1) and SU (2) groups will provide the proper transformation laws for bosonic and spinorial fields. Spin connections will be found to be purely Riemannian.

scholarly journals A demonstration that electroweak theory can violate parity automatically (leptonic case)

2018 ◽  
Vol 33 (04) ◽  
pp. 1830005 ◽  
Author(s):  
C. Furey
Keyword(s):  
Clifford Algebra ◽  
Ad Hoc ◽  
Higgs Bosons ◽  
Electroweak Theory ◽  
Ladder Operators ◽  
Raising And Lowering Operators ◽  
Ladder Operator ◽  
Left And Right ◽  
Electroweak Model ◽  
Lowering Operators

We bring to light an electroweak model which has been reappearing in the literature under various guises.[Formula: see text] In this model, weak isospin is shown to act automatically on states of only a single chirality (left). This is achieved by building the model exclusively from the raising and lowering operators of the Clifford algebra [Formula: see text]. That is, states constructed from these ladder operators mimic the behaviour of left- and right-handed electrons and neutrinos under unitary ladder operator symmetry. This ladder operator symmetry is found to be generated uniquely by [Formula: see text] and [Formula: see text]. Crucially, the model demonstrates how parity can be maximally violated, without the usual step of introducing extra gauge and extra Higgs bosons, or ad hoc projectors.

scholarly journals ELECTROWEAK QUARK–LEPTON SYMMETRY AND WEAK TOPOLOGICAL-CHARGE CONFINEMENT IN THE STANDARD MODEL WITH DIRAC NEUTRINOS

2007 ◽  
Vol 22 (21) ◽  
pp. 3669-3691 ◽  
Author(s):  
ERNESTO A. MATUTE
Keyword(s):  
Standard Model ◽  
Topological Charge ◽  
Additive Group ◽  
Weak Field ◽  
Anomaly Cancellation ◽  
Charge Quantization ◽  
Lepton Charge ◽  
The Standard Model ◽  
The One ◽  
Electroweak Model

The standard electroweak model with Dirac neutrinos is extended by way of the principles of electroweak quark–lepton symmetry and weak topological-charge confinement to account for quark–lepton charge relations which, if not accidental, are indicative of charge structures. A mixing in quarks and leptons of underlying integer local charges with integer weak topological charges associated with an additive group Z3, fixed by the anomaly cancellation requirement, is discussed. It is found that the electroweak difference between topological quarks and leptons is the nonequivalence between the topological vacua of their weak field configurations, produced by a four-instanton which carries the topological charge, induces the universal fractional piece of charge distinguishing quarks from leptons, and breaks the underlying symmetry. The constituent quarks of the standard model appear as coming from topological quarks, via the weak four-instanton event. Dual transitions occur for leptons. It is shown that several other fundamental problems left open in the standard electroweak model with Dirac neutrinos are solved: the one-to-one correspondence between quark and lepton flavors, the existence of three generations, the conservation and ungauging of B-L, the electric charge quantization, and the confinement of fractional electric charges.

scholarly journals LOW-ENERGY SECTOR OF EIGHT-DIMENSIONAL GENERAL RELATIVITY: ELECTROWEAK MODEL AND NEUTRINO MASS

2008 ◽  
Vol 17 (05) ◽  
pp. 785-798 ◽  
Author(s):  
FRANCESCO CIANFRANI ◽  
GIOVANNI MONTANI
Keyword(s):  
General Relativity ◽  
Lower Bound ◽  
Electric Charge ◽  
Dimensional Reduction ◽  
Higgs Sector ◽  
Low Energy ◽  
Fine Tuning ◽  
Neutrino Masses ◽  
Electroweak Model ◽  
Kaluza Klein

We demonstrate that in a Kaluza–Klein space–time V4 ⊗ S1 ⊗ S3, the dimensional reduction of spinors provides a 4-field, whose associated SU(2) gauge connections are geometrized. However, additional and gauge-violating terms arise, but they are highly suppressed by a factor β, which fixes the amount of the spinor dependence on extra-coordinates. The application of this framework to the Electroweak Model is performed, thus giving a lower bound for β due to electric charge conservation. We emphasize that the Higgs sector can be reproduced also, but neutrino masses are predicted and the fine-tuning on the Higgs parameters can additionally be explained.

My Life with Quarks

2015 ◽  
Vol 04 (01) ◽  
pp. 66-70
Author(s):  
Sheldon Lee Glashow
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Particle Physics ◽  
Quantum Field ◽  
Gim Mechanism ◽  
The Many ◽  
Doctoral Work ◽  
Electroweak Model

This is a personal, anecdotal and autobiographical account of my early endeavors in particle physics, emphasizing how they interwove with the conception and eventual acceptance of the quark hypothesis. I focus on the years from 1958, when my doctoral work at Harvard was completed, to 1970, when John Iliopoulos, Luciano Maiani and I introduced the GIM mechanism, thereby extending the electroweak model to include all known particles, and some that were not then known. I have not described the profound advances in quantum field theory and the many difficult and ingenious experimental efforts that undergird my story which is not intended to be an inclusive record of this exciting decade of my discipline. My tale begins almost two years before I met Murray and over five years before the invention of quarks.

ON FERMION NUMBER VIOLATION AT HIGH ENERGIES

1990 ◽  
Vol 05 (16) ◽  
pp. 1279-1289 ◽  
Author(s):  
KENICHIRO AOKI
Keyword(s):  
High Energy ◽  
Back Reaction ◽  
Coupling Constant ◽  
Fermion Number ◽  
High Energy Behavior ◽  
Energy Behavior ◽  
Low Energies ◽  
Naive Dimensional Analysis ◽  
Group Flow ◽  
Electroweak Model

By considering the back reaction of the scattered particles on instantons, the explicit high energy behavior of fermion number violating amplitudes in the standard electroweak model is obtained to the leading order in the coupling constant. The amplitudes decay faster than what is expected from naive dimensional analysis due to the renormalization group flow of the coupling constant and this is consistent with unitarity. Also, it is shown that the constrained instanton approach is valid at low energies, while the high energy behavior is governed by the back reaction of the external particles.

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