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 A UNIQUE SU(5) AND SO(10) UNIFICATION WITH COMPLETE DYNAMICAL SYMMETRY BREAKING

1987 ◽  
Vol 02 (02) ◽  
pp. 409-442 ◽  
Author(s):  
KYUNGSIK KANG ◽  
ALAN R. WHITE
Keyword(s):  
Symmetry Breaking ◽  
Dynamical Symmetry ◽  
Chiral Condensate ◽  
Physical Significance ◽  
Electroweak Symmetry Breaking ◽  
Dynamical Analysis ◽  
Asymptotic Freedom ◽  
Electroweak Symmetry ◽  
Quark Sector ◽  
The Standard Model

A unique asymptotically free, anomaly-free, SU(5) gauge theory is proposed as a possible complete unification of the standard model in which all symmetry-breaking is dynamical. The asymptotic freedom constraint is saturated, removing renormalon divergences and leaving well-defined instanton interactions as the only nonperturbative ingredient of the theory. Consequently, it is argued, topological vacuum polarization of a very heavy, unconventional quantum number, quark sector dominates the dynamics, producing SU(5) symmetry breaking and a three generation low energy spectrum. Electroweak symmetry breaking is due to a chiral condensate of color sextet quarks. The embedding of the theory in a single SO(10) representation is used for the dynamical analysis and may also have physical significance.

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.

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.

scholarly journals INVESTIGATIONS OF ELECTROWEAK SYMMETRY BREAKING MECHANISM FOR HIGGS BOSON DECAYS INTO FOUR FERMIONS

2020 ◽  
pp. 8-12
Author(s):  
T.V. Obikhod ◽  
E.A. Petrenko
Keyword(s):  
Higgs Boson ◽  
Symmetry Breaking ◽  
Gluon Fusion ◽  
Higgs Doublet ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Decay Modes ◽  
Significant Difference ◽  
Vector Bosons ◽  
Breaking Mechanism

Models with extended Higgs boson sectors are of prime importance for investigating the mechanism of electroweak symmetry breaking for Higgs decays into four fermions and for Higgs-production in association with a vector bosons. In the framework of the Two-Higgs-Doublet Model using two scenarios obtained from the experimental measurements we presented next-to-leading-order results on the four-fermion decays of light CP-even Higgs boson, h → 4f. With the help of Monte Carlo program Prophecy 4f 3.0, we calculated the values Γ = ΓEW/(ΓEW + ΓSM) and Γ = ΓEW+QCD/(ΓEW+QCD + ΓSM) for Higgs boson decay channels H → νµµeνe, µµee, eeee. We didn’t find significant difference when accounting QCD corrections to EW processes in the decay modes of Higgs boson. Using computer programs Pythia 8.2 and FeynHiggs we calculated the following values: σ(V BH)BR(H → ZZ) and σ(V BF)BR(H → WW) for VBF production processes, σ(ggH)BR(H → WW) and σ(ggH)BR(H → ZZ) for gluon fusion production process at 13 and 14 TeV and found good agreement with experimental data.

HIGGS DOUBLET AS COMPOSITE GOLDSTONE BOSON: CHALLENGE TO MULTI-TEV ENERGY COLLIDERS

1992 ◽  
Vol 07 (26) ◽  
pp. 6473-6492 ◽  
Author(s):  
YU. F. PIROGOV
Keyword(s):  
Standard Model ◽  
Symmetry Breaking ◽  
Goldstone Boson ◽  
Higgs Doublet ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Nonlinear Realization ◽  
Collider Phenomenology ◽  
Effective Lagrangian ◽  
The Standard Model

The minimum nonlinear extension SU(3)×U(1)/SU(2)×U(1) to the Standard Model, where the Higgs doublet is a composite Goldstone boson, is investigated. The canonical nonlinear realization of the extended symmetry is constructed in the form maximally close to that of the Standard Model. The corresponding most general effective Lagrangian is built. A simplest linear realization of the extended symmetry in an extended fermion sector is found. The Higgs-Goldstone scenario of the electroweak symmetry breaking is outlined from the standpoint of the multi-TeV energy collider phenomenology.

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.

LARGE CROSS-SECTIONS FOR W+W− AND Z0Z0 PAIRS AND COLOR SEXTET QUARKS

1987 ◽  
Vol 02 (06) ◽  
pp. 397-408 ◽  
Author(s):  
ALAN R. WHITE
Keyword(s):  
Symmetry Breaking ◽  
Cross Section ◽  
Cross Sections ◽  
Production Cross Section ◽  
Production Cross ◽  
Chiral Condensate ◽  
Electroweak Symmetry Breaking ◽  
Grand Unification ◽  
Electroweak Symmetry ◽  
Scaling Arguments

Dynamical electroweak symmetry breaking by a chiral condensate of color sextet quarks is expected to produce large cross-sections for W+W− and Z0Z0 pairs due to direct QCD production. Cross-section estimates based on a combination of chiral and diffractive scaling arguments are shown to be consistent with the candidate events observed at CERN. Other implications of sextet quarks for QCD dynamics and for Grand Unification are also briefly described.

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.

scholarly journals Vector Bosons Signals of Electroweak Symmetry Breaking

2014 ◽  
Author(s):  
R. Sekhar Chivukula ◽  
Elizabeth H. Simmons ◽  
Chun Du ◽  
Hong-Jian He ◽  
Yu-Ping Kuang ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Electroweak Symmetry Breaking ◽  
Electroweak Symmetry ◽  
Vector Bosons

scholarly journals Dark matter spectra from the electroweak to the Planck scale

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Christian W. Bauer ◽  
Nicholas L. Rodd ◽  
Bryan R. Webber
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Symmetry Breaking ◽  
Planck Scale ◽  
Electroweak Symmetry Breaking ◽  
Indirect Detection ◽  
Electroweak Symmetry ◽  
Stable States ◽  
Decay Spectrum ◽  
Crucial Ingredient

Abstract We compute the decay spectrum for dark matter (DM) with masses above the scale of electroweak symmetry breaking, all the way to the Planck scale. For an arbitrary hard process involving a decay to the unbroken standard model, we determine the prompt distribution of stable states including photons, neutrinos, positrons, and antiprotons. These spectra are a crucial ingredient in the search for DM via indirect detection at the highest energies as being probed in current and upcoming experiments including IceCube, HAWC, CTA, and LHAASO. Our approach improves considerably on existing methods, for instance, we include all relevant electroweak interactions.

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