Showing papers on "Gauge boson published in 1993"
TL;DR: Using a linear realization of the Goldstone bosons, a complete set of dimension-six operators which are SU(2)[times]U(1) gauge invariant and conserve [ital C] and [ital P] are considered to study effects of new physics which originates above 1 TeV and the Higgs boson mass dependence of the results can be investigated.
Abstract: Novel strong interactions in the electroweak bosonic sector are expected to induce effective interactions between the Higgs doublet field and the electroweak gauge bosons which lead to anomalous $\mathrm{WWZ}$ and $\mathrm{WW}\ensuremath{\gamma}$ vertices once the Higgs field acquires a vacuum expectation value. Using a linear realization of the Goldstone bosons, we consider a complete set of dimension-six operators which are SU(2)\ifmmode\times\else\texttimes\fi{}U(1) gauge invariant and conserve $C$ and $P$. This approach allows us to study effects of new physics which originates above 1 TeV and the Higgs boson mass dependence of the results can be investigated. Four of the dimension-six operators affect low energy and present CERN LEP experiments at the tree level. Another five influence neutral and charged current experiments at the one-loop level and three of these lead to anomalous $\mathrm{WWZ}$ and $\mathrm{WW}\ensuremath{\gamma}$ vertices. Their loop contributions are at most logarithmically divergent, and these logarithmic divergences can be understood as renormalizations of the four operators which contribute at the tree level. Constraints on the remaining five operators can be obtained if one assumes the absence of cancellations between the tree level and one-loop contributions. The resulting bounds on anomalous triple gauge boson couplins are modest, which emphasizes the importance of direct measurements of the triple gauge boson vertices, e.g., in ${W}^{+}{W}^{\ensuremath{-}}$ production at LEP II.
447 citations
TL;DR: In this article, the critical limit of lattice gauge theory was shown to be renormalizable, and the exact propagator of the Fermi ghost possesses a 1/( q 2 ) 2 singularity at q = 0.
259 citations
TL;DR: In this paper, the authors present an explicit example in which the whole particle spectrum is given as a function of the top quark mass, and the existence of Kaluza-Klein excitations for gauge bosons and higgses is predicted.
241 citations
TL;DR: In this article, the Glashow-Iliopoulos-Maiani mechanism for neutral-current suppression in both the gauge and Higgs sectors was studied. But the main features of these models are that in order to cancel the triangle anomalies the number of families must be divisible by three (the number of colors).
Abstract: We study the Glashow-Iliopoulos-Maiani mechanism for flavor-changing neutral-current suppression in both the gauge and Higgs sectors, for models with $\mathrm{SU}{(3)}_{L}\ensuremath{\bigotimes}\mathrm{U}{(1)}_{N}$ gauge symmetry. The models differ from one another only with respect to the representation content. The main features of these models are that in order to cancel the triangle anomalies the number of families must be divisible by three (the number of colors) and that the lepton number is violated by some lepton-gauge bosons and lepton-scalar interactions.
237 citations
TL;DR: New resonance physics is most readily discernible in the high–pT distributions of the single top quark and of the W boson.
Abstract: The production cross–section and distributions of the top quark are sensitive to new physics, e.g., the tt system can be a probe of new resonances or gauge bosons that are strongly coupled to the top quark, in analogy to Drell–Yan production. The existence of such new physics is expected in dynamical electroweak symmetry breaking schemes, and associated with the large mass of the top quark. The total top production cross–section can be more than doubled, and distributions significantly distorted with a chosen scale of new physics of ∼ 1 TeV in the vector color singlet or octet s–channel. New resonance physics is most readily discernible in the high–pT distributions of the single top quark and of the W boson.
206 citations
TL;DR: A revised and complete list of the electroweak chiral Lagrangian operators up to dimension four and the connection to the [ital S], [ital T], and [ital U] parameters and the parameters describing the triple gauge boson vertices is made.
Abstract: A revised and complete list of the electroweak chiral Lagrangian operators up to dimension four is provided. The connection of these operators to the $S$, $T$, and $U$ parameters and the parameters describing the triple gauge boson vertices $\mathrm{WW}\ensuremath{\gamma}$ and $\mathrm{WWZ}$ is made, and the size of these parameters from new heavy physics is estimated using a one flavor-doublet model of heavy fermions. The coefficients of the chiral Lagrangian operators are also computed in this model.
177 citations
TL;DR: In this article, the authors discuss the size of deviations from SM predictions which may be expected in Higgs boson production and decay rates, and show that large enhancements are allowed e.g. in the Z → Hγ and H → γγ partial decay widths, leading to Z → ∆γγ events at LEP.
152 citations
TL;DR: In this article, the authors developed the concept of an average action for gauge theories in the continuum and computed the average scalar potential of the abelian Higgs model in arbitrary dimensions.
148 citations
TL;DR: In this paper, the authors present a method which allows them to deal with the strong infrared effects in three-dimensional gauge theories and compute the threedimensional running of the gauge coupling.
134 citations
TL;DR: In this paper, the Yang-Mills interaction is induced in the naive one-loop approximation by the heavy scalar field in the adjoint representation, which develops a vacuum average, the fluctuations of which describe elementary excitations of our gauge theory.
123 citations
TL;DR: In this paper, the authors studied the electrodynamics of generic charged particles (bosons, fermions, relativistic or not) constrained to move on an infinite plane.
TL;DR: In this article, it was shown that the present experimental limits on μ-e conversion in nuclei give a nuclear-model-independent bound on the Z-e-μ vertex which is twice as strong as that obtained from μ → eee.
TL;DR: In this paper, the authors study operator gauge transformations which lead in a natural way to the introduction of ghost fields and find that only the former save gauge invariance in second order.
Abstract: Pure quantized Yang-Mills theories are constructed by causalperturbation theory. We study operator gauge transformations which lead in a natural way to the introduction of ghost fields. Considering fermionic as well as bosonic ghosts, we find that only the former save gauge invariance in second order. We work with free quantum fields throughout, so that all expressions are mathematically well defined.
TL;DR: The QCD corrections to the longitudinal and transverse components of the electroweak gauge boson self-energies for arbitrary momentum transfer and for different internal quark masses are presented.
TL;DR: In this paper, it was shown that the present experimental limits on $Z-e$ conversion in nuclei give a nuclear-model-independent bound on the $Z$-$e$-$\mu$ vertex which is twice as strong as that obtained from the ε-to-e e e −mu vertex.
Abstract: Together with the existence of new neutral gauge bosons, models based on extended gauge groups (rank $> 4$) often predict also new charged fermions. A mixing of the known fermions with new states with {\it exotic} weak-isospin assignments (left-handed singlets and right-handed doublets) will induce tree level flavour changing neutral interactions mediated by $Z$ exchange, while if the mixing is only with new states with {\it ordinary} weak-isospin assignments, the flavour changing neutral currents are mainly due to the exchange of the lightest new neutral gauge boson $Z^\prime$. We show that the present experimental limits on $\mu-e$ conversion in nuclei give a nuclear-model-independent bound on the $Z$-$e$-$\mu$ vertex which is twice as strong as that obtained from $\mu\to e e e$. In the case of E$_6$ models these limits provide quite stringent constraints on the $Z^\prime$ mass and on the $Z-Z^\prime$ mixing angle. We point out that the proposed experiments to search for $\mu-e$ conversion in nuclei have good chances to find evidence of lepton flavour violation, either in the case that new exotic fermions are present at the electroweak scale, or if a new neutral gauge boson $Z^\prime$ of E$_6$ origin lighter than a few TeV exists.
TL;DR: In this paper, a gauge invariant way to compute one loop corrections to processes involving the production and decay of unstable particles is presented, which is a generalization of the approach presented in this paper.
Abstract: We present a gauge invariant way to compute one loop corrections to processes involving the production and decay of unstable particles.
TL;DR: In this paper, the authors compute the one-loop scalar and vector boson self-energies in the zero-momentum limit and find a non-vanishing magnetic mass for the SU(2) gauge bosons.
Book•
31 Mar 1993
TL;DR: The history of modern particle physics space-time symmetries in quantum field theory can be found in this paper, with a general overview of the current state of the art in particle physics.
Abstract: Genesis and overview of modern particle physics space-time symmetries in quantum field theory global internal symmetries and their spontaneous breakdown gauge symmetry groups and their spontaneous breakdown gauge theory of the strong interaction (QCD) gauge theory of the electroweak interaction (QFD) chiral anomalies on the standard model and beyond unification of the strong and electroweak interactions fermion generation problems and preon models topological conservation laws.
TL;DR: In this paper, a wide class of three-dimensional Abelian gauge theories with a bare Chern-Simons term is spontaneously broken by dynamical generation of a nonvanishing magnetic field.
CERN1
TL;DR: In this paper, it was shown that heavy fermions do not decouple in the presence of discrete gauge anomalies, and that cancellation of discrete-gauge anomalies cannot be described merely in terms of low-energy operators involving only the light-fermions.
TL;DR: In this article, the production of gauge bosons such as W ± and Z in pp collisions up to √ s = 0.5 TeV was examined in connection with the realistic possibility of having polarized proton beams at RHIC with a high luminosity.
TL;DR: In this article, the authors considered the possibility that the Higgs doublet responsible for the breaking of the electroweak gauge group could be quasi-Goldstone bosons of a spontaneously broken approximate global symmetry of the theory.
TL;DR: In this article, a model-independent framework is presented for the production of scalar and vector leptoquarks in e + e − annihilation. And the most general coupling to the known fermions and gauge bosons which are dimensionless, baryon and lepton number conserving, family-diagonal, and SU (3) c × SU (2) L × U (1) Y invariant.
TL;DR: In this article, a covariant tensor notation is developed in which gauge invariance of the formalism is manifest, and matter couplings are constructed in a gauge invariant fashion both for point particles and Fermi fields.
TL;DR: In this article, the production of the Z boson pairs via fusion of the two polarized backscattered laser photons at an e+e− linear collider is considered and explicit formulas for bosonic loop contributions to the helicity amplitudes are given.
TL;DR: The long wavelength behavior of the gauge field is shown to be in the Gaussian universality class with a dynamical exponent z=3 in dimensions D≥2.5 implying that the gauge coupling constant is exactly marginal.
Abstract: The problem of an electron gas interacting via exchanging transverse gauge bosons is studied using the renormalization group method. The long wavelength behavior of the gauge field is shown to be in the Gaussian universality class with a dynamical exponent z=3 in dimensions D≥2. This implies that the gauge coupling constant is exactly marginal. Scattering of the electrons by the gauge mode leads to non-Fermi-liquid behavior in D≤3. The asymptotic electron and gauge Green's functions, interaction vertex, specific heat, and resistivity are presented
TL;DR: In this paper, the authors consider the possibility that neutrinoless double beta decay may occur in models with unbroken lepton number via the emission of a massive gauge boson with electron lepton numbers $-2.
Abstract: We consider the possibility that neutrinoless double beta decay may occur in models with unbroken lepton number via the emission of a massive gauge boson with electron lepton number $-2$. We determine the shape of the $\beta\,\beta$ sum energy spectrum as a function of the gauge coupling, independent of model-specific details. We discuss our results in light of the persistent experimental claims that excess events are observed near but below the spectrum endpoint of several elements.
TL;DR: In this paper, the shape of the β β sum energy spectrum as a function of the gauge coupling was determined, independent of model-specific details, and the results were discussed in light of persistent experimental claims that excess events are observed near but below the spectrum endpoint of several elements.
CERN1
TL;DR: In this paper, it is argued that confining effects in 3D non-Abelian gauge theories imply the existence of the condensates of the gauge and Higgs fields in 3-dimensional vacuum.
TL;DR: In this article, a rigorous construction of the Schwinger functions of the pure SU(2) Yang-Mills field theory in four dimensions with a fixed infrared cutoff but no ultraviolet cutoff, in a regularized axial gauge, was provided.
Abstract: We provide the basis for a rigorous construction of the Schwinger functions of the pure SU(2) Yang-Mills field theory in four dimensions (in the trivial topological sector) with a fixed infrared cutoff but no ultraviolet cutoff, in a regularized axial gauge. The construction exploits the positivity of the axial gauge at large field. For small fields, a different gauge, more suited to perturbative computations is used; this gauge and the corresponding propagator depends on large background fields of lower momenta. The crucial point is to control (in a non-perturbative way) the combined effect of the functional integrals over small field regions associated to a large background field and of the counterterms which restore the gauge invariance broken by the cutoff. We prove that this combined effect is stabilizing if we use cutoffs of a certain type in momentum space. We check the validity of the construction by showing that Slavnov identities (which express infinitesimal gauge invariance) do hold non-perturbatively.