scholarly journals Bootstrap Dynamical Symmetry Breaking

2013 ◽  
Vol 2013 ◽  
pp. 1-19
Author(s):  
Wei-Shu Hou
Keyword(s):  
Symmetry Breaking ◽  
Yukawa Coupling ◽  
Dynamical Symmetry ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Light Higgs Boson ◽  
Gap Equation ◽  
Dynamical Symmetry Breaking ◽  
Longitudinal Modes ◽  
Goldstone Bosons

Despite the emergence of a 125 GeV Higgs-like particle at the LHC, we explore the possibility of dynamical electroweak symmetry breaking by strong Yukawa coupling of very heavy new chiral quarksQ. Taking the 125 GeV object to be a dilaton with suppressed couplings, we note that the Goldstone bosonsGexist as longitudinal modesVLof the weak bosons and would couple toQwith Yukawa couplingλQ. WithmQ≳700 GeV from LHC, the strongλQ≳4could lead to deeply boundQQ¯states. We postulate that the leading “collapsed state,” the color-singlet (heavy) isotriplet, pseudoscalarQQ¯mesonπ1, isGitself, and a gap equation without Higgs is constructed. Dynamical symmetry breaking is affected via strongλQ, generatingmQwhile self-consistently justifying treatingGas massless in the loop, hence, “bootstrap,” Solving such a gap equation, we find thatmQshould be several TeV, orλQ≳4π, and would become much heavier if there is a light Higgs boson. For such heavy chiral quarks, we find analogy with theπ−Nsystem, by which we conjecture the possible annihilation phenomena ofQQ¯→nVLwith high multiplicity, the search of which might be aided by Yukawa-boundQQ¯resonances.

DYNAMICAL SYMMETRY BREAKING, AXION DYNAMICS AND INSTANTON-INDUCED SECOND-CLASS τ-DECAYS

1987 ◽  
Vol 02 (12) ◽  
pp. 945-955 ◽  
Author(s):  
ALAN R. WHITE
Keyword(s):  
Symmetry Breaking ◽  
Decay Mode ◽  
Anomalous Dimension ◽  
Dynamical Symmetry ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Scaling Properties ◽  
Dynamical Symmetry Breaking ◽  
Axion Mass

Small color instantons, which have been proposed as a mechanism to raise the axion mass, may also produce a large rate for the second-class τ-decay mode τ → πηντ. The growth of the QCD coupling and large anomalous dimension scaling properties needed are natural consequences of dynamical electroweak symmetry breaking by color sextet quarks.

RADIATIVE EFFECTS AND ELECTROWEAK SYMMETRY BREAKING IN A SUPERSYMMETRIC PREON MODEL

1999 ◽  
Vol 14 (09) ◽  
pp. 1389-1427
Author(s):  
JONGBAE KIM
Keyword(s):  
Symmetry Breaking ◽  
Dynamical Symmetry ◽  
Electroweak Symmetry Breaking ◽  
Effective Theory ◽  
Supersymmetric Particle ◽  
Electroweak Symmetry ◽  
Radiative Effects ◽  
Yukawa Couplings ◽  
Lepton Universality

We construct the low energy effective theory of composite quarks, leptons, and Higgs bosons for a supersymmetric preon model and study the effects of renormalization-group based radiative corrections. The study on the evolution of scalar masses for avoiding color and charge breakings leads us to conclude that Yukawa couplings are bounded from above. The implementation of electroweak symmetry breaking requires that only the purely dynamical symmetry breaking should be needed for the model, but the combined scheme of dynamical and radiative symmetry breaking as well as the purely radiative symmetry breaking scheme be disfavored. Our analysis of [Formula: see text] including radiative effects shows that, should a discrepancy be found between the observed and the theoretical value of [Formula: see text] after experimental determination of supersymmetric particle masses, it would imply that the complete quark–lepton universality in the supersymmetric preon model does not hold either for the Yukawa couplings, or for the condensates, or for both.

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 Light Higgs boson from multi-phase criticality in dynamical symmetry breaking

2021 ◽  
pp. 136241
Author(s):  
Kristjan Kannike ◽  
Luca Marzola ◽  
Martti Raidal ◽  
Alessandro Strumia
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Dynamical Symmetry ◽  
Light Higgs Boson ◽  
Dynamical Symmetry Breaking ◽  
Multi Phase

scholarly journals Is SMEFT enough?

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Timothy Cohen ◽  
Nathaniel Craig ◽  
Xiaochuan Lu ◽  
Dave Sutherland
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Independent Set ◽  
Higgs Doublet ◽  
New Physics ◽  
Effective Field ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Goldstone Bosons ◽  
The Standard Model

Abstract There are two canonical approaches to treating the Standard Model as an Effective Field Theory (EFT): Standard Model EFT (SMEFT), expressed in the electroweak symmetric phase utilizing the Higgs doublet, and Higgs EFT (HEFT), expressed in the broken phase utilizing the physical Higgs boson and an independent set of Goldstone bosons. HEFT encompasses SMEFT, so understanding whether SMEFT is sufficient motivates identifying UV theories that require HEFT as their low energy limit. This distinction is complicated by field redefinitions that obscure the naive differences between the two EFTs. By reformulating the question in a geometric language, we derive concrete criteria that can be used to distinguish SMEFT from HEFT independent of the chosen field basis. We highlight two cases where perturbative new physics must be matched onto HEFT: (i) the new particles derive all of their mass from electroweak symmetry breaking, and (ii) there are additional sources of electroweak symmetry breaking. Additionally, HEFT has a broader practical application: it can provide a more convergent parametrization when new physics lies near the weak scale. The ubiquity of models requiring HEFT suggests that SMEFT is not enough.

INFRARED ANOMALOUS INTERACTIONS AS A SIGNAL FOR ELECTROWEAK SYMMETRY BREAKING BY COLOR SEXTET QUARKS

1986 ◽  
Vol 01 (03) ◽  
pp. 693-708 ◽  
Author(s):  
ERIC BRAATEN ◽  
ALAN R. WHITE ◽  
CHARLES R. WILLCOX
Keyword(s):  
Symmetry Breaking ◽  
Axial Vector ◽  
Dynamical Symmetry ◽  
Chiral Condensate ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Gauge Invariant ◽  
Effective Lagrangian ◽  
Vector Bosons ◽  
Gauge Anomalies

We study the possibility that electroweak symmetry breaking occurs dynamically as a consequence of a chiral condensate of color sextet quarks. New (but conventional) leptons are used to cancel gauge anomalies. An effective Lagrangian with a Wess-Zumino term is used to describe “sextet pion” interactions and associated chiral anomalies. We show that the gauge-invariant effective Lagrangian which describes infrared interactions of the physical W± and Z0 vector bosons contain axial-vector chiral anomalies generated by lepton loops. Lepton-induced anomalous interactions would therefore be a signal of this form of dynamical symmetry breaking.

scholarly journals Connecting Electroweak Symmetry Breaking and Flavor: A Light Dilaton D and a Sequential Heavy Quark Doublet Q

Symmetry ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 312
Author(s):  
Wei-Shu Hou
Keyword(s):  
Symmetry Breaking ◽  
Yukawa Coupling ◽  
Vector Boson ◽  
Hadron Collider ◽  
Goldstone Boson ◽  
Gluon Fusion ◽  
New Physics ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Mass Generation

The 125 GeV boson is quite consistent with the Higgs boson of the Standard Model (SM), but there is a challenge from Anderson as to whether this particle is in the Lagrangian. As Large Hadron Collider (LHC) Run 2 enters its final year of running, we ought to reflect and make sure we have gotten everything right. The ATLAS and CMS combined Run 1 analysis claimed a measurement of 5.4σ vector boson fusion (VBF) production which is consistent with SM, which seemingly refutes Anderson. However, to verify the source of electroweak symmetry breaking (EWSB), we caution that VBF measurement is too important for us to be imprudent in any way, and gluon–gluon fusion (ggF) with similar tag jets must be simultaneous measured, which should be achievable in LHC Run 2. The point is to truly test the dilaton possibility—the pseudo-Goldstone boson of scale invariance violation. We illustrate EWSB by dynamical mass generation of a sequential quark doublet (Q) via its ultrastrong Yukawa coupling and argue how this might be consistent with a 125 GeV dilaton, D. The ultraheavy 2mQ≳4–5 TeV scale explains the absence of New Physics so far, while the mass generation mechanism shields us from the UV theory for the strong Yukawa coupling. Collider and flavor physics implications are briefly touched upon. Current Run 2 analyses show correlations between the ggF and VBF measurements, but the newly observed tt¯H production at LHC poses a challenge.

THE LATEST STATUS OF LHC AND THE EWSB PHYSICS

2010 ◽  
Vol 25 (27n28) ◽  
pp. 5196-5209
Author(s):  
S. ASAI
Keyword(s):  
Gauge Theory ◽  
Higgs Boson ◽  
Symmetry Breaking ◽  
Strong Coupling ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Light Higgs Boson ◽  
Physics Potential ◽  
Crucial Test

The latest status of LHC and the performances of ATLAS and CMS detectors are summarized in the first part. Physics potential to solve the origin of the ElectroWeak Symmetry Breaking is summarized in the 2nd part, focusing especially on two major scenarios, (1) the light Higgs boson plus SUSY and (2) the Strong Coupling Gauge Theory. Both ATLAS and CMS detectors have the excellent potential to discover them, and we can perform crucial test on the ElectroWeak Symmetry Breaking.

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