Showing papers on "Higgs boson published in 1979"
TL;DR: In this article, the phase diagram of lattice gauge theories coupled to fixed-length scalar (Higgs) fields is studied and it is shown that when the Higgs fields transform like the fundamental representation of the gauge group, the confining phases are smoothly connected, i.e., they are not separated by a phase boundary.
Abstract: We study the phase diagram of lattice gauge theories coupled to fixed-length scalar (Higgs) fields. We consider several gauge groups: ${Z}_{2}$, U(1), and $\mathrm{SU}(N)$. We find that when the Higgs fields transform like the fundamental representation of the gauge group the Higgs and confining phases are smoothly connected, i.e., they are not separated by a phase boundary. When the Higgs fields transform like some representation other than the fundamental, a phase boundary may exist. This is the case for $\mathrm{SU}(N)$ with all the Higgs fields in the adjoint representation and for U(1) with all the Higgs fields in the charge-$N(Ng1)$ representation. We present an argument due to Wegner that indicates the stability of the pure gauge transition. Another phase, free charge or Coulomb, is generally present. In this regime, the spectrum of the theory contains massless gauge bosons (for continuous groups) and finite-energy states that represent free charges.
739 citations
TL;DR: In this paper, the super Higgs effect in the (2, 3 2 ) + ( 1 2, 0 +, 0 − ) model is studied using the recently developed tensor calculus: it contains an arbitrary function of two variables G (A,B), A and B being the 0+ scalar and 0− pseudoscalar fields of the matter system.
554 citations
CERN1
TL;DR: In this article, it was shown that the requirement that no interaction becomes strong and no vacuum instability develops up to the unification energy implies upper and lower bounds to the fermion masses as well as the Higgs boson mass.
507 citations
TL;DR: In this article, the Weinberg angle and the mass of the Higgs particle are predicted from a 6-dimensional Yang-Mills theory by imposing rotational symmetry in the extra, compact dimensions.
451 citations
TL;DR: In this paper, the parity broken solution is shown to be an absolute minimum of the potential in SU(2)L × SU( 2)R × U(1) based left-right symmetric gauge theory.
448 citations
TL;DR: In this article, the authors considered a SU(2) @ U(1) gauge theory with two (or more) Higgs doublets, but with the fermion mass scale dctcrmined by the vacuum expectation values of the Higgs particles rather than determined only by widely differing Higgs couplings.
353 citations
TL;DR: In this paper, the Higgs fields transform as doublets under SU(2) × U(1) in six dimensions, with the components of the gauge potentials in the extra dimensions playing the role of Higgs' fields.
293 citations
TL;DR: In this article, the authors studied phase transitions in the lattice version of the abelian Higgs model, a model which can exhibit both spontaneous symmetry breaking and confinement, and they applied the lessons learned from lattice Higgs models to understand the behavior of weak interactions at high temperature.
240 citations
TL;DR: In this paper, the Higgs structure of the O(10) model is described explicitly and the mixing angles and the t-quark mass are determined by the underlying grand unified theory.
237 citations
TL;DR: In this paper, the theory and phenomenology of such a situation were examined as a guide for future experimental searches in theories with more scalar multiplets than the minimal Weinberg-Salam model, where there will exist charged physical Higgs particles in addition to the neutral Higgs particle.
Abstract: In theories with more scalar multiplets than the minimal Weinberg-Salam model, there will exist charged physical Higgs particles, in addition to the neutral Higgs particle. We examine the theory and phenomenology of such a situation as a guide for future experimental searches.
TL;DR: In this paper, it was shown that the true Higgs mesons do not mediate flavor changing interactions and that the masses of the spinless mesons can be arbitrarily large without affecting the structure of the weak interactions.
CERN1
TL;DR: In this article, the observed pattern of fermion masses, including m d and m e, is consistent with the simplest SU(5) grand unified model with just a 24 and a 5 of Higgs fields, if one takes into account possible effective low-energy apparently non-renormalizable interactions scaled by inverse powers of the Planck mass.
TL;DR: In this article, the decay of a Z-boson into a Higgs boson and monochromatic photon is computed to leading order in the standard SU(2) × U(1) gauge theory.
TL;DR: In this article, the Weinberg-Salam model was used to place constraints on fermion and Higgs Boson masses and it was shown that spontaneous symmetry breakdown cannot generate fermions in excess of about 300 GeV.
CERN1
TL;DR: In this article, the authors make a systematic study of the phenomenology of a Higgs boson in this mass range, and find that it may be observable in ϒ decays and pp collisions, as well as in toponium decays.
TL;DR: In this article, it was shown that the Higgs is unlikely to be detected at LEP if its mass is greater than 150 GeV, which is the threshold for the existence of a heavy Weinberg-salam-type neutral Higgs boson.
TL;DR: An example of the unification of electroweak, color, and heavy-color forces in the unifying group SU(7) is presented in this article, where a simple toy model predicts a nontrivial mass spectrum for two families of quarks and leptons.
Abstract: An example of the unification of electroweak, color, and heavy-color forces in the unifying group SU(7) is presented. This simple toy model predicts a nontrivial mass spectrum for two families of quarks and leptons. The usual Higgs scalar sector is replaced by the strong interaction heavy-color sector at \ensuremath{\sim} 1 TeV.
TL;DR: In this paper, it was shown that a previously found instability for the SU(2) Yang-Mills field equation can be removed by a (1 + 1) dimensional Higgs mechanism.
TL;DR: In this paper, the authors examined the high-temperature behavior of softly broken symmetries such as gauge invariance as well as parity and time-reversal invariance in a class of models of quantum flavor dynamics.
Abstract: We have examined the high-temperature behavior of softly broken symmetries such as gauge invariance as well as parity and time-reversal invariance in a class of models of quantum flavor dynamics. We find that there exist domains of coupling parameters of the theory, for which the above symmetries remain broken at high temperatures. Such models have the potential to explain matter-antimatter asymmetry in the universe while at the same time providing a cure for the strong CP problem. The fermion and boson masses in these models increase with temperature. A signature for such models is the existence of heavy Higgs bosons (with m/sub H/> or approx. =m/sub W/).
TL;DR: In this paper, the Higgs-boson production cross sections were estimated by calculating the subprocess gluon +gluon and heavy-quark-antiquark pair.
Abstract: We estimate the Higgs-boson production cross sections dsigma/dy and dsigma/dydq/sup ts2//sub T/ at y = 0 in p (p-bar) p collisions by calculating the subprocess gluon + gluon ..-->.. Higgs boson + heavy-quark-antiquark pair.
TL;DR: In this paper, the Weinberg-Salam SU/sub 2/ x U/sub 1/ gauge model was shown to have a multiplicatively conserved quantum number, where π = +-1.
Abstract: The leptons ..nu../sub e/, e, ..nu../sub ..mu../, ..mu.., ..nu../sub tau/, tau, and analogously the quarks u, d, c, s, t, b, are unified within the Weinberg-Salam SU/sub 2/ x U/sub 1/ gauge model without enlarging the gauge group. The result is a theory in which the familiar leptons, quarks, and gauge bosons, plus some extra Higgs bosons necessary for unification, all carry a new multiplicatively conserved quantum number ..pi.. = +- 1. The most striking results of this unification are (1) ..pi.. conservation forbids ..mu.. ..-->.. e..gamma.. but allows the Higgs-boson-mediated decays tau ..-->.. l..gamma.. (l = e or ..mu..) and tau ..-->.. ..mu..ee or e..mu mu.., at a calculable rate with a calculable lower limit; (2) for quarks, two of the three Cabibbo angles must be zero, so that the b quark (assumed lighter than t) decays only via Higgs-boson exchange, always semileptonically and always with lepton-number violation, e.g., b ..-->.. de/sup +/..mu../sup -/. This singular prediction will confirm or exclude the model as soon as b-flavored mesons are discovered. These and other phenomenological consequences of this unification are explained, and rates are estimated.
TL;DR: In this paper, a unified Weinberg-Salam model in terms of the Yang-Mills theory of SU ( 2 1 ) over a Minkowski superspace is formulated, and the gauge potentials comprise vector bosons and Higgs scalars.
TL;DR: The cross section varies between 5 × 10 −38 and 10 −39 cm 2 for Higgs masses between 5GeV and 40 GeV in the Weinberg-Salam model as mentioned in this paper.
TL;DR: In this paper, a solution to the strong CP problem within the context of a Weinberg-Salam model with two Higgs fields coupled in a Peccei-Quinn symmetric fashion is presented.
TL;DR: In this article, the reaction e+e− → Hγ was studied off resonance in the standard SU (2) × U (1) model and the rate depends on the square of the number of heavy fermion multiplets.
TL;DR: In this article, a lattice version of the Abelian Higgs model is studied in arbitrary Euclidean dimension, and two different representations of the theory are used to understand what phases exist for the system.
Abstract: A lattice version of the Abelian Higgs model is studied in arbitrary Euclidean dimension. Two different representations of the theory, one in terms of the Higgs and gauge fields and the other in terms of the topological excitations, are used to understand what phases exist for the system. In addition to limiting cases there is, in two dimensions, a plasma phase of vortex excitations. The vortices (instantons) in this phase cause confinement (in the sense of Wilson) of fractional, but not integer, charges. In three and more dimensions, there is a plasma phase similar to the one in two dimensions as well as another phase which does not confine any charge. We argue that the confinement due to topological excitations in the plasma phase has the same physical basis as the usual large-coupling-constant (high temperature) confinement of the lattice gauge theory. Effects of a background field in two dimensions are also described.
TL;DR: Theoretically, the hypothetical existence of new color interactions, which participate in the spontaneous breaking of the weak-interaction group, will in general lead to relatively light composite pseudo Goldstone bosons as mentioned in this paper.
Abstract: The hypothetical existence of new color interactions, which participate in the spontaneous breaking of the weak-interaction group, will in general lead to relatively light composite pseudo Goldstone bosons. Their production and decay characteristics are analyzed to be close to, yet actually distinguishable from, those of the elementary Higgs bosons of the Weinberg-Salam model.
TL;DR: In this paper, the properties of non-Abelian and Abelian lattice Higgs models are discussed, and it is argued that a similar transition occurs in four dimensions, with liberated magnetic monopoles in the QED phase, but electric monopoles, quarks, are never confined.