scholarly journals Low-energy signals of strongly-coupled electroweak symmetry-breaking scenarios

2016 ◽  
Vol 93 (5) ◽  
Author(s):  
Antonio Pich ◽  
Ignasi Rosell ◽  
Joaquín Santos ◽  
Juan José Sanz-Cillero
Keyword(s):  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Low Energy ◽  
Electroweak Symmetry ◽  
Strongly Coupled

CHARGE-1/2 FERMIONS AND THE SU(4) COLOR MODEL

1992 ◽  
Vol 07 (15) ◽  
pp. 1315-1323 ◽  
Author(s):  
ROBERT FOOT ◽  
OSCAR F. HERNÁNDEZ
Keyword(s):  
Symmetry Breaking ◽  
Mass Range ◽  
Electroweak Symmetry Breaking ◽  
Low Energy ◽  
Color Model ◽  
Electroweak Symmetry ◽  
The Standard Model ◽  
Energy Theory ◽  
Electrically Charged ◽  
Breaking Scale

The SU(4) color models represent possible alternatives to the standard model. These theories replace the color gauge group SU(3) c by SU(4) c . The SU(4) c symmetry is assumed to be broken which leads to the SM as the effective low energy theory. An interesting feature of these theories is that the SU(4) symmetry breaking scale can be very low, and may be approximately at the same scale as the electroweak symmetry breaking. These models imply the existence of exotic electrically charged ±1/2 fermions. We examine various SU(4) c models to explore the circumstances under which these models can have the exotic charged fermions in the interesting mass range m≳100 GeV .

scholarly journals PHYSICS AT e-e-: A CASE FOR MULTI-CHANNEL STUDIES

1998 ◽  
Vol 13 (14) ◽  
pp. 2227-2234 ◽  
Author(s):  
HITOSHI MURAYAMA
Keyword(s):  
Symmetry Breaking ◽  
Parity Violation ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Next Generation ◽  
Strongly Coupled

I argue that it would be crucial to have as many channels as possible to understand the physics of electroweak symmetry breaking (EWSB) in next-generation collider experiments. A historic example of the parity violation and the V-A interaction is used to make this point. An e-e- option offers us a new channel in this respect. The usefulness of this channel is exemplified for the case of supersymmetry and of the strongly coupled EWSB sector.

scholarly journals DEVIATIONS FROM LOW-ENERGY THEOREM FOR VLVL SCATTERING DUE TO PSEUDO-GOLDSTONE BOSONS

1998 ◽  
Vol 13 (38) ◽  
pp. 3045-3061
Author(s):  
TOMÁS BAHNÍK ◽  
JIŘÍ HOŘEJSÍ
Keyword(s):  
Symmetry Breaking ◽  
Symmetric Space ◽  
Vector Boson ◽  
Goldstone Boson ◽  
Electroweak Symmetry Breaking ◽  
Low Energy ◽  
Tree Level ◽  
Electroweak Symmetry ◽  
Goldstone Bosons ◽  
Vector Bosons

Possible deviations from a low-energy theorem for the scattering of strongly interacting longitudinally polarized W and Z bosons are discussed within a particular scheme of electroweak symmetry breaking. The scheme (suggested earlier by other authors in a slightly different context) is based on spontaneous breakdown of an SU(4) symmetry to custodial SU(2) subgroup. The physical spectrum of such a model contains a set of relatively light pseudo-Goldstone bosons whose interactions with vector bosons modify the low-energy theorem proven for a "minimal" symmetry-breaking sector The Goldstone-boson manifold SU(4)/SU(2) is not a symmetric space. In this context it is observed that, on the other hand, there is a large class of models of electroweak symmetry breaking, involving groups G and H such that the G/H is a symmetric space and the corresponding rich multiplets of pseudo-Goldstone bosons do not influence the canonical low-energy theorem. For the scheme considered here, the relevant interactions are described in terms of an effective chiral Lagrangian and tree-level contributions of the pseudo-Goldstone boson exchanges to the vector boson scattering are computed explicitly. A comparison with the standard model is made.

scholarly journals Strongly coupled gauge theories: What can lattice calculations teach us?

2017 ◽  
Vol 32 (35) ◽  
pp. 1747003
Author(s):  
A. Hasenfratz ◽  
R. C. Brower ◽  
C. Rebbi ◽  
E. Weinberg ◽  
O. Witzel
Keyword(s):  
Symmetry Breaking ◽  
Gauge Theories ◽  
Bound State ◽  
Electroweak Symmetry Breaking ◽  
Coupled Systems ◽  
Electroweak Symmetry ◽  
Strongly Coupled ◽  
Fermion Systems ◽  
Competing Models ◽  
Open Question

The dynamical origin of electroweak symmetry breaking is an open question with many possible theoretical explanations. Strongly coupled systems predicting the Higgs boson as a bound state of a new gauge-fermion interaction form one class of candidate models. Due to increased statistics, LHC run II will further constrain the phenomenologically viable models in the near future. In the meanwhile it is important to understand the general properties and specific features of the different competing models. In this work we discuss many-flavor gauge-fermion systems that contain both massless (light) and massive fermions. The former provide Goldstone bosons and trigger electroweak symmetry breaking, while the latter indirectly influence the infrared dynamics. Numerical results reveal that such systems can exhibit a light [Formula: see text] isosinglet scalar, well separated from the rest of the spectrum. Further, when we set the scale via the vev of electroweak symmetry breaking, we predict a 2 TeV vector resonance which could be a generic feature of SU(3) gauge theories.

scholarly journals ELECTROWEAK SYMMETRY BREAKING DUE TO CONFINEMENT

2000 ◽  
Vol 15 (08) ◽  
pp. 525-530 ◽  
Author(s):  
CHUN LIU
Keyword(s):  
Symmetry Breaking ◽  
Supersymmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Low Energy ◽  
Electroweak Symmetry ◽  
Yang Mills ◽  
Effective Description

Within the framework of gauge mediated supersymmetry breaking, we consider an electroweak symmetry breaking pattern in which there is no conventional μ term. The pattern is made appealing through realizing it as low energy effective description of a supersymmetric Yang–Mills theory which is of confinement. Phenomenological implications are discussed.

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