scholarly journals SCALE OF MASS GENERATION FOR MAJORANA NEUTRINOS

2005 ◽  
Vol 20 (14) ◽  
pp. 3082-3088
Author(s):  
HONG-JIAN HE ◽  
DUANE A. DICUS
Keyword(s):  
Narrow Range ◽  
High Energy ◽  
Electroweak Symmetry Breaking ◽  
Fermion Mass ◽  
Electroweak Symmetry ◽  
Final State ◽  
Mass Generation ◽  
Upper Limit ◽  
Fermion Masses ◽  
Majorana Neutrinos

Scales of mass generation for Majorana neutrinos (as well as quarks and leptons) can be probed from high energy 2 → n inelastic scattering involving a multiple longitudinal gauge boson final state. We demonstrate that the unitarity of 2 → n scattering puts the strongest new upper limit on the scale of fermion mass generation, independent of the electroweak symmetry breaking scale [Formula: see text]. Strikingly, for Majorana neutrinos (quarks and leptons), we find that the strongest 2 → n limits fall in a narrow range, 136 - 170 TeV (3 - 107 TeV ) with n = 20 - 24 (n = 2 - 12), depending on the observed fermion masses. Physical implications are discussed.

scholarly journals Fermion mass hierarchy in grand gauge-Higgs unification

2019 ◽  
Vol 2019 (8) ◽  
Author(s):  
Nobuhito Maru ◽  
Yoshiki Yatagai
Keyword(s):  
Top Quark ◽  
Electroweak Symmetry Breaking ◽  
Boson Mass ◽  
Fermion Mass ◽  
Mass Hierarchy ◽  
Electroweak Symmetry ◽  
Fermion Masses ◽  
The Standard Model ◽  
Mass Terms ◽  
The One

Abstract Grand gauge-Higgs unification of 5D $SU(6)$ gauge theory on an orbifold $S^1/Z_2$ is discussed. The Standard Model (SM) fermions are introduced on one of the boundaries and some massive bulk fields are also introduced so that they couple to the SM fermions through the mass terms on the boundary. Integrating out the bulk fields generates SM fermion masses with exponentially small bulk mass dependences. The SM fermion masses except for the top quark are shown to be reproduced by mild tuning of the bulk masses. The one-loop Higgs potential is calculated and it is shown that electroweak symmetry breaking occurs by introducing additional bulk fields. The Higgs boson mass is also computed.

Links between flavor and electroweak symmetry breaking

2014 ◽  
Vol 29 (21) ◽  
pp. 1444007
Author(s):  
George Wei-Shu Hou
Keyword(s):  
Symmetry Breaking ◽  
Scale Invariance ◽  
Vector Boson ◽  
New Physics ◽  
Electroweak Symmetry Breaking ◽  
Fermion Mass ◽  
Electroweak Symmetry ◽  
Mass Generation ◽  
Gap Equation ◽  
The Standard Model

Fermion mass generation in the standard model was invented by Weinberg, while it is an old notion that strong Yukawa coupling could be the agent of electroweak symmetry breaking. Observation of the 126 GeV boson has crashed the prospects for such a heavy chiral quark doublet Q. However, the dilaton possibility can only be ruled out by confirming vector boson fusion with Run 2 data at the LHC, which starts only in 2015. We recast the [Formula: see text] condensation scenario as Fermi–Yang model v2.0. A Gap Equation has been constructed, with numerical solution demonstrating dynamical mQ generation; scale invariance of this equation may be consistent with a dilaton. Other consequences to be checked are [Formula: see text] "annihilation stars," and enhanced Bd →μ+μ-, KL →π0νν, and possibly sin ϕs. If verified in Nature, the Agent of BEH mechanism would differ from current perception, the 126 GeV boson would be the first New Physics at the LHC, and we would have enough CP violation for baryogenesis.

scholarly journals Electroweak symmetry breaking and fermion masses from extra dimensions

2003 ◽  
Vol 669 (1-2) ◽  
pp. 128-158 ◽  
Author(s):  
Claudio A. Scrucca ◽  
Marco Serone ◽  
Luca Silvestrini
Keyword(s):  
Symmetry Breaking ◽  
Extra Dimensions ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Fermion Masses

TOPOLOGICAL MASS GENERATION, ELECTROWEAK SYMMETRY BREAKING AND BARYOGENESIS

2009 ◽  
Vol 24 (09) ◽  
pp. 703-711
Author(s):  
B. BASU ◽  
P. BANDYOPADHYAY
Keyword(s):  
Phase Transition ◽  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Chiral Anomaly ◽  
Electroweak Theory ◽  
Electroweak Symmetry ◽  
Mass Generation ◽  
Two Stages ◽  
Topological Mass ◽  
Good Agreement

We have studied here electroweak symmetry breaking and baryogenesis from the viewpoint of topological mass generation through chiral anomaly. It is shown that the SU(2) gauge symmetry of the electroweak theory breaks in two stages. In the final stage we have Z-strings produced at the phase transition. We have also studied the problem of baryogenesis in this formalism and the ratio of the baryon–antibaryon is found to be in good agreement with the observed value.

scholarly journals THE HIGGS PUZZLE: EXPERIMENT AND THEORY

2002 ◽  
Vol 17 (23) ◽  
pp. 3300-3317
Author(s):  
FABIO ZWIRNER
Keyword(s):  
Higgs Boson ◽  
High Energy ◽  
Experimental Information ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Supersymmetric Extension ◽  
Light Higgs Boson ◽  
Open Questions ◽  
The Standard Model ◽  
Spatial Dimensions

The present experimental and theoretical knowledge of the physics of electroweak symmetry breaking is reviewed. Data still favor a light Higgs boson, of a kind that can be comfortably accommodated in the Standard Model or in its Minimal Supersymmetric extension, but exhibit a non-trivial structure that leaves some open questions. The available experimental information may still be reconciled with the absence of a light Higgs boson, but the price to pay looks excessive. Recent theoretical ideas, linking the weak scale with the size of possible extra spatial dimensions, are briefly mentioned. It is stressed once more that experiments at high-energy colliders, such as the Tevatron and the LHC, are the crucial tool for eventually solving the Higgs puzzle.

THE CHIRAL LAGRANGIAN APPROACH TO THE NON-UNIVERSAL EFFECTS IN THE $Z b \bar b$ VERTEX

1994 ◽  
Vol 09 (21) ◽  
pp. 1955-1961 ◽  
Author(s):  
X. ZHANG
Keyword(s):  
Top Quark ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Coset Space ◽  
Dynamical Models ◽  
Quark Loop ◽  
Mass Generation ◽  
Effective Lagrangian ◽  
Gauge Interaction ◽  
Chiral Lagrangian

We calculate the top quark loop corrections to the [Formula: see text] vertex in the chiral Lagrangian of the dynamical electroweak symmetry breaking theory. We use the effective Lagrangian based on coset space SU(2)×U(1)/U(1) with the electroweak gauge interaction switched off, so these corrections are directly related to the physics associated with the heavy top quark and the mass generation in the dynamical models.

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