Showing papers on "Electroweak interaction published in 1981"
TL;DR: In this paper, a detailed description of many of the necessary background topics, including gauge theories, spontaneous symmetry breaking, the standard SU2 x U1 electroweak model and its modifications and extensions, Majorana and Dirac neutrino masses, the induced cosmological term, CP violation, quantum chromodynamics and its symmetries, and dynamical symmetry breaking are reviewed.
943 citations
CERN1
TL;DR: In this paper, a strong-coupling, confining version of the standard SU(2)L × U(1) electroweak model was considered and it was shown that at high energies (⪆100 GeV) the confining model exhibits bound state quark and lepton structure, and intermediate vector boson heavier than the standard model.
215 citations
TL;DR: In this paper, the spectral function sum rules were used to determine the symmetry breakdown pattern of the electroweak symmetry breakdown for a large class of models, including weak mixing angles and pseudo-Goldstone bosons.
196 citations
TL;DR: In this article, a composite model of quarks and lepton satisfying 't Hooft's anomaly conditions, where the electroweak interactions are left-right symmetric and are not associated with broken local flavour symmetries, is presented.
81 citations
TL;DR: In this article, the neutral-current and charged-current cross sections in neutrino and antineutrino interactions were obtained with the fine-grain calorimeter of the CHARM Collaboration at the CERN 200 GeV narrow-band neutrinos beam.
76 citations
TL;DR: In this paper, the first-order electroweak radiative corrections to differential and total charged-and neutral-current cross sections and to the parity violating asymmetry observed in ed scattering at SLAC were calculated analytically.
58 citations
53 citations
TL;DR: In this paper, an electroweak gauge model is discussed, where generations are associated with separate gauge groups with different couplings, and the observed universality is the result of a mass-scale inequality.
Abstract: An electroweak gauge model is discussed, where generations are associated with separate gauge groups with different couplings. The observed ..mu..-e universality is the result of a mass-scale inequality, ..nu../sub 03/ M/sub W/ and M/sub Z//sub i/>M/sub Z/.
52 citations
TL;DR: In this paper, tests based on neutrinoless double-..beta.. decay and rare muon processes are proposed for the detection of a heavy Majorana neutrino with a mass of approx.100 GeV.
Abstract: Tests based on neutrinoless double-..beta.. decay and rare muon processes are proposed for the detection of a heavy Majorana neutrino with a mass of approx.100 GeV. Existence of such a neutrino would distinguish between the standard and left-right-symmetric electroweak gauge models with U(1) in the latter identified with (B-L). The sensitivity of these processes to the mass of the heavy Majorana neutrino is discussed.
45 citations
TL;DR: In this paper, low-energy electroweak interactions are described in terms of the SU(2)xU(1) Glashow, Weinberg, Salem, Ward gauge model.
Abstract: Low-energy electroweak interactions are described in terms of the SU(2)xU(1) Glashow, Weinberg, Salem, Ward gauge model. (AIP)
42 citations
CERN1
TL;DR: In this article, the authors estimate velocities and flux near the sun of superheavy magnetic monopoles, and show that the bulk of the monopoles appear fast enough to ionize matter.
TL;DR: In this article, an effective lagrangian was constructed to describe the couplings of these mesons to one another and to the gauge bosons of colour and the electroweak interactions.
TL;DR: In this article, it was suggested that the familiar color and electroweak forces may be responsible for the intrinsic masses of the quarks and leptons in theories without elementary scalar fields.
TL;DR: In this paper, the one-loop contributions to the amplitude A and B in the standard electroweak gauge model were computed. But they were not considered in this paper, and the result is of importance if all mass effects are to be correctly taken into account.
Abstract: We compute exactly all the one-loop contributions to the amplitude A..-->..B..gamma.., where A and B are fermions of the same charge, but different flavor, in the standard electroweak gauge model. The result is of importance if all mass effects are to be correctly taken into account.
TL;DR: In this article, the authors performed a high-statistics measurement of Bhabha scattering and of the production of hadrons in electron-positron annihilation at PETRA energies (12 < or =..sqrt..s-bar< or =36.7 GeV).
Abstract: We have performed a high-statistics measurement of Bhabha scattering and of the production of hadrons in electron-positron annihilation at PETRA energies (12< or =..sqrt..s-bar< or =36.7 GeV). Combining the results with measurements of ..mu../sup +/..mu../sup -/ and tau/sup +/tau/sup -/ production enables us to compare our results with electroweak theory. We find sin/sup 2/theta/sub W/ = 0.27 +- 0.08. This is in good agreement with the value obtained from neutrino experiments which were carried out in entirely different kinematic regions.
TL;DR: In this article, the authors compute the order α 2 electroweak contribution, using chiral perturbation theory, in models with SU (N) × SU(N) and SU(2N) chiral symmetry.
TL;DR: The stability of the proton and its relationship to the conservation law for baryon number is discussed in this paper, where it is shown that the existence of such particles and the order of magnitude of the Proton lifetime are consistent with theories attempting to unify the strong and electroweak forces.
Abstract: The stability of the proton and its relationship to the conservation law for baryon number is discussed. Of the non-dynamical conservation laws, only that for baryon number has not been associated with the strong or electroweak forces and shown to be a mathematical consequence of modern theories of elementary particle interactions. There are indications that baryon number conservation may not be exact and that consequently protons should have a finite lifetime. Theoretically proton decay is possible only with the admission of extremely heavy exotic particles. The existence of such particles and the order of magnitude of the proton lifetime are consistent with theories attempting to unify the strong and electroweak forces. Current and proposed experiments to detect proton decay are briefly described.
01 Jan 1981
TL;DR: In this article, a left-right symmetric gauge theory of electroweak interactions is considered in which only one Higgs field and its charge conjugate couple to quarks are considered.
TL;DR: In this paper, it was shown that SU(2) L breaking at very early stages of the expansion of the universe result in production of an acceptable baryon excess, even in the framework of the minimal SU(5) model with three fermion generations.
TL;DR: In this article, the differential cross sections of the reactions were measured at energies between 33.0 and 36.7 GeV and compared with the standard model of electroweak interaction yields sin 2 θ W = 0.25 ± 0.13.
TL;DR: In this paper, it was shown that there exists a range of values of parameters which lead to a supercooled transition from the symmetric SU (5) phase to the asymmetric SU(3) x SU(2) x U(1) phase when the scalar quartic coupling constants in the Higgs potential are O(g/sup 4/), g being the gauge coupling constant.
Abstract: We demonstrate that there exists a range of values of parameters which leads to a supercooled transition from the symmetric SU(5) phase to the asymmetric SU(3) x SU(2) x U(1) phase when the scalar quartic coupling constants in the Higgs potential are O(g/sup 4/), g being the gauge coupling constant. We find that the transition is supercooled throughout most of the light Higgs region. These results are compared with the results of phase transitions in the standard model of electroweak interactions, and are shown to lead to magnetic-monopole suppression, but other serious problems arise.
TL;DR: Ferrara, John Ellis and Peter van Nienwenhuizen as mentioned in this paper described the fundamental interactions in terms of particles that carry different physical attributes, and classified the interactions between certain particles of different spin can be classified under the concept of supersymmetry.
Abstract: Sergio Ferrara, John Ellis and Peter van Nienwenhuizen (eds) 1981 New York: Plenum xii + 727 pp price $79.50 The fundamental interactions are currently described in terms of particles that carry different physical attributes. Interactions between certain particles of different spin can be classified under the concept of supersymmetry, and those that mediate the strong and electroweak forces are described in terms of the representation of certain Lie groups.
TL;DR: In this paper, a new class of models is proposed in which both strong CP violation and large |ΔS| = 2 effects may be avoided in electroweak gauge theories with dynamical symmetry breaking.
Abstract: The recent proposal of Eichten, Lane, and Preskill for CP nonconservation in electroweak gauge theories with dynamical symmetry breaking is reviewed. Through the alignment of the vacuum with the explicit chiral symmetry breaking Hamiltonian, these theories provide a natural way to understand the dynamical origin of CP nonconservation. Special attention is paid to the problem of strong CP violation. Even though all vacuum angles are zero, this problem is not automatically avoided. In the absence of strong CP violation, the neutron electric dipole moment is expected to be 10-24-10-26 e-cm. A new class of models is proposed in which both strong CP violation and large |ΔS| = 2 effects may be avoided. in these models, |ΔC| = 2 processes such as D00 mixing may be large enough to observe.
TL;DR: In this article, spin asymmetries in the production of gauge bosons, such as Z0, Wsu± and γ, at large pT from the collision of longitudinally polarized hadrons using QCD perturbation theory and the electroweak gauge model in the framework of a hard scattering model were predicted.
TL;DR: In this paper, the one-loop electroweak radiative corrections to parity violation in atomic physics are calculated in the context of the standard SU(2) × U(1) model.
TL;DR: In this article, a seven-dimensional geometrical structure for the physical event continuum is proposed, which allows us to formulate gauge (anisotropic Yang-Mills) interactions for quarks and leptons.
Abstract: A new (seven-dimensional) geometrical structure is proposed for the physical event continuum that allows us to formulate gauge (anisotropic Yang-Mills) interactions for quarks and leptons. A Dyson analysis of the resulting quantum field theory shows a bifurcation between chiral and nonchiral interactions, the former giving rise to unconfined leptons and the standardSU
2,L ×U
1 description of electroweak interactions, the latter leading to confined quarks. For the electroweak theory we calculate (to lowest order in the original coupling constants) sin2
ϑ
W=1/4. A brief discussion of the structure of the hadronic world emerging from theSU
3,colour interaction is presented.
TL;DR: In this article, the authors derived the general expressions for the differential cross section and final state polarization ine+e−→γ,Z 1 0,Z 2 0, →ff (f: leptons and quarks) with several neutral bosons and with polarized beams.
Abstract: We derive the general expressions for the differential cross section and final state polarization ine+e−→γ,Z 1 0 ,Z 2 0 , →ff (f: leptons and quarks) with several neutral bosons and with polarized beams From this also the jet axis distributions ine+e− → 2 jets are obtained The general formulas are applied to the standard model and extended gauge models of electroweak interactions with one neutral boson lighter than the standard modelZ0 The models differ from each other in the coefficients of angular distributions at energies around the firstZ0 resonance and beyond Observable effects are expected in certain models already at energies up to 60 GeV if the firstZ0 is not too heavy
TL;DR: In this paper, the Glashow-Iliopoulos-Maiani mechanism was used for the correction of the s-->dgamma* loop in the four-quark model.
Abstract: We examine the short-distance quantum-chromodynamic corrections to the elementary electroweak process s-->dgamma* within the four-quark model with the Glashow-Iliopoulos-Maiani mechanism incorporated The bare result is found to be modified by a factor around -1 We also consider the s-->dgamma* loop within the six-quark model of Kobayashi and Maskawa The effect of the extension to six quarks seems to be of order 10% of the four-quark-model result
TL;DR: On the assumption that the SU(2)(X)U(1) symmetry of the zero-mass electroweak model undergoes dynamical breakdown to charge U(1), this article applied the gauge technique to determine an equation for the ratio of the boson mass to the averaged fermion mass of a given generation; this equation appears to have more than one solution.
Abstract: On the assumption that the SU(2)(X)U(1) symmetry of the zero-mass electroweak model undergoes dynamical breakdown to charge U(1), the authors apply the gauge technique to determine an equation for the ratio of the boson mass to the averaged fermion mass of a given generation; this equation appears to have more than one solution.