Showing papers on "Gauge boson published in 1987"
TL;DR: In this paper, the abelian projection of SU(n) gauge theories is carried out both in the continuum and on the lattice, and the degrees of freedom are abelians, gluons, quarks, and magnetic monopoles.
283 citations
TL;DR: In this paper, it was shown that QCD originates in the chiral color group SU(3)×SU(3), and that the scale of chiral-color breaking is similar to the electroweak mass scale.
250 citations
TL;DR: In this article, a Monte Carlo calculation of the gluon propagator in the Landau gauge in SU(3) lattice gauge theory is described, and the results of calculations at β = 5.6 (200 43 × 8 lattices), β = 4.8 (400 43 × 10 lattices) and β = 6.0 (100 43 × 6 lattices).
230 citations
TL;DR: In this paper, a cubic vertex is derived as a non-linear realisation in four dimensions, which reproduces previously known cubic interaction terms for arbitrary integer helicity as well as interactions between different helicities.
Abstract: In the light-front formulation of particle dynamics the authors introduce transverse creation and annihilation operators. Using these they formulate a free-field theory containing all massless bosonic representations of the Poincare group. They then derive a cubic vertex as a non-linear realisation in four dimensions. This vertex reproduces previously known cubic interaction terms for arbitrary integer helicity as well as interactions between different helicities. The authors also give a complete list of all possible cubic couplings between massless Bose fields.
168 citations
TL;DR: In this paper, the authors investigated the production of a standard Higgs boson pair in proton-proton collisions at the SSC energy, which alloys us to study the trilinear Higgs coupling.
128 citations
TL;DR: In this paper, the electromagnetic and axial currents and corresponding form factors of solitons resulting from a non-linear chiral theory of pions, ρ and ω mesons are investigated.
127 citations
TL;DR: In this paper, the symmetry factor 12 is needed in order to satisfy the unitarity constraint in the one-loop order of the Polyakov approach, and the effective action to order (α′)3 is found to receive the string loop corrections whose parameters are fixed already at the string tree level.
110 citations
TL;DR: In this paper, the SU(2)L × U(1)Y model was analyzed and it was shown that spontaneous CP violation occurs both as the result of Higgs boson exchange and the usual KM mechanism of gauge Boson exchange.
103 citations
TL;DR: In this article, the damping constant of color electric plasma oscillations in a Colomb gauge was computed in a covariant manner using linear response theory, and the result agreed with an earlier calculation in the A0 = 0 gauge.
97 citations
TL;DR: In this article, the covariant path integral formalism is used to compute the 3-and 4-point scattering amplitudes for gravitons, antisymmetric tensors, and gauge bosons in the heterotic string model.
91 citations
TL;DR: In a nonperturbative setting, however, one encounters an obstacle which, on a formal level, exists also in the continuum formulation as discussed by the authors, and possible ways to avoid it are discussed.
TL;DR: In this article, the perturbed stationary states (PSS) equations were shown to be equivalent to the dynamical equations of a particle with N internal degrees of freedom minimally coupled to U (N) static gauge potentials.
TL;DR: In this paper, the authors have justified the gauge invariant version of the chiral Schwinger model and performed canonical quantization via Dirac brackets, showing that the constraints are first class, exhibiting gauge invariance.
TL;DR: In this paper, the spin-spin and spin-orbit potentials from lattice gauge theory simulations for the pure gauge sector with both SU(2) and SU(3) colour groups were evaluated.
TL;DR: In this article, the integrability condition is used to determine whether a given candidate infinitesimal symmetry arises from an exact symmetry, and a new type of gauge invariance involving associative commutative algebras is proposed.
Abstract: It has been shown that the most general type of gauge invariance for a single massless spin-2 field is either 'normal' spin-2 gauge invariance or general covariance. The authors extend that analysis to the case of a collection of spin-2 fields. They obtain the general solution of the integrability condition which determines whether a given candidate infinitesimal symmetry arises from an exact symmetry. This general solution is a new type of gauge invariance involving associative commutative algebras in a manner analogous to the way gauge symmetries of collections of spin-1 fields are based on Lie algebras.
CERN1
TL;DR: In this paper, the possibility of observing new neutral gauge bosons from E6 superstring-inspired models at hadron colliders is examined and a general parametrization for the cases of one and two extra neutrals is discussed and currently popular models are included as particular examples.
TL;DR: In this article, the authors studied the process of gauge symmetry breaking in superstring-inspired models with two, one and no extra Z 0'gauge bosons, and gave analytic expressions for the solutions of the renormalization group equations for the masses and couplings of an arbitrary extra U(1) model.
TL;DR: In this article, the one-loop effective action for a gluon plasma is calculated in a general covariant background field gauge, expressed in terms of the dielectric constant and the magnetic permeability, which immediately yields dispersion relations for both longitudinal and transverse plasma waves.
TL;DR: The production and subsequent decays of the S- and P-wave quarkonium states of a heavy quark that may be produced at a multi-TeV hadron collider are studied to assess the prospects for discovery of a new heavy quarks via its bound-state decays.
Abstract: We study the production and subsequent decays of the S- and P-wave quarkonium states of a heavy quark that may be produced at a multi-TeV hadron collider. Our considerations are focused on the lighter member of a fourth-generation doublet, for which the weak decays of the quark are expected to be suppressed by mixing angles. For quarkonium masses \ensuremath{\lesssim}1 TeV, the dominant production is via gluon fusion. In addition to the decay channels that are present in the charm and bottom systems, heavy quarkonia can decay into ${W}^{+}$${W}^{\mathrm{\ensuremath{-}}}$, ${Z}^{0}$${Z}^{0}$, and ${Z}^{0}$\ensuremath{\gamma} pairs. Furthermore, the latter decay rates may be enhanced due to couplings of the heavy quarks to the longitudinal components of the gauge bosons. We assess the prospects for discovery of a new heavy quark via its bound-state decays. Quarks with masses up to \ensuremath{\approxeq}100 GeV can be found from the decay of the ${1}^{\mathrm{\ensuremath{-}}\mathrm{\ensuremath{-}}}$ state (\ensuremath{\psi}) into lepton pairs. If the decay of the pseudoscalar quarkonium state into a Z boson and a Higgs boson is kinematically allowed, there is a rather clean signal for the Higgs boson, even for the intermediate-mass Higgs boson with 2${m}_{t}$${m}_{H}$2${M}_{W}$. Furthermore, H\ensuremath{\gamma} and HH pairs would also be present at fairly large rates.
TL;DR: In this article, the OSp(1, 1|2) method used previously for deriving gauge-invariant free field theory actions for bosonic particles and strings can be applied to fermionic particles and string after a trivial modification.
TL;DR: In this article, it was shown that the intermediate-scale phase transition does not occur until the temperature of the universe falls below O(m w ), after which an enormous excess of entropy is generated.
CERN1
TL;DR: In this article, the decay rate of the new Z into W + W − is greater than the one into e + e − (μ + μ −, τ + μ− ), giving rise to a new signature.
TL;DR: In this paper, it has been shown that light dilaton is unlikely in the case of a slowly varying running coupling and chiral symmetry breaking, and the effect of a physical high energy cutoff as motivated in a technicolor context.
TL;DR: In this paper, the paraphoton-electron coupling strength was shown to be at least as strong as the axion-electric coupling at keV energies, and it was shown that planned solar axion detectors would not distinguish axions and paraphotons.
TL;DR: A linear combination of polarized forward-backward asymmetry and polarization asymmetry with initial-state-electron longitudinal polarization whose deviation from the value of the standard model can measure the effects of new currents directly.
Abstract: We study various forward-backward and polarization asymmetries evaluated near the Z/sup 0/ resonance for theories with SU(2)/sub L/ x U(1)/sub Y/ x U(1)/sub Y//sub '/ and SU(2)/sub L/ x SU(2)/sub R/ x U(1)/sub B//sub -//sub L/ gauge structures. Extension to other gauge structures is very simple in our formalism. We construct a linear combination of polarized forward-backward asymmetry and polarization asymmetry with initial-state-electron longitudinal polarization whose deviation from the value of the standard model can measure the effects of new currents directly. The analysis is exact at the tree level of the theory and enables one to study any model with any Higgs sector in terms of a fixed number of parameters. The results show that for a typical class of models the measurement of different asymmetries to 1% will impose a lower bound on M/sub Z//sub '/, the mass of an additional neutral gauge boson, to be of order 10 M/sub Z/. Even much less accurate measurements will yield interesting information about new gauge structures. We also examine the implications of extended gauge structures for the precise value of the W/sup +- / mass.
TL;DR: In this paper, the rate for heavy quark production via W-gluon fusion is calculated in the effective W approximation and excellent agreement is found with the exact calculation, and the contribution from the Drell-Yan mechanism and from gluon fusion.
TL;DR: In this paper, an ambidextrous electroweak interaction model with SU(2L×SU(2)R×U(1) gauge symmetry is described, in which the conventional quarks and leptons are accompanied by a set of new fermions that transform as singlets of SU( 2L× SU(R)R. The model has only two doublets of Higgs scalars.
TL;DR: The existence of a new U(1) gauge coupling is considered in this paper, where the coupling is constrained by the demand that the model be anomaly free and that the right-handed neutrino not be light.
TL;DR: In this article, the decays of a heavy neutral gauge boson (Z,Z) into superstring-inspired electroweak models with an extra U(1) gauge group, two Higgs doublets, and a Higgs singlet were evaluated.
Abstract: We evaluate the decays of a heavy neutral gauge boson ${Z}_{2}$ into ${W}^{+}$${W}^{\mathrm{\ensuremath{-}}}$, the Z and a Higgs boson, or two Higgs bosons in superstring-inspired electroweak models with an extra U(1) gauge group, two Higgs doublets, and a Higgs singlet. The branching ratios for these processes are generally similar and two-boson decay modes of ${Z}_{2}$ must exist at the few-percent level if kinematically accessible, although the bosonic modes which dominate in any given scenario depend on the U(1) quantum numbers and mixing in the Higgs sector. Lower bounds on the ${Z}_{2}$ mass versus the Z,Z' mixing are discussed; for the no-scale must be above 550 GeV.
TL;DR: In this paper, a general class of consistent self and mutual couplings of higher-spin gauge fields is given, where the interactions are constructed from Abelian curvatures and involve higher derivatives.
Abstract: A general class of consistent self- and mutual couplings of higher-spin gauge fields is given. The interactions are constructed from Abelian curvatures and so involve higher derivatives.