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Kang, Y.S.

California Univ., Berkeley (USA)

California Univ., Berkeley (USA)

AbstractAbstract

[en] In Chapter I, the neutral current phenomenology of a class of supersymmetric SU(2) x U(1) x U(1) models is analyzed. A model with the simplest fermion and Higgs structure allowing a realistic mass spectrum is considered first. Its neutral current sector is parametrized in terms of two mixing angles and the strength of the new U(1) interactions. Expressions for low-energy model-independent parameters are derived and compared with those of the standard model. Bounds on the neutral gauge boson masses are obtained from the data for various neutrino interactions, eD scattering, and the asymmetry in e

^{+}e^{-}→μ^{+}μ^{-}. A similar analysis is performed on models in which a set of isosinglet Higgs fields contribute to the neutral gauge boson mass matrix. Other predictions of these models which may be relevant to future experiments are discussed. In Chapter II, the evolution of fermion mass in grand unified theories is reexamined. In particular, the question of gauge invariance of mass ratios in left-right asymmetric theories is considered. A simple expression is derived for the evolution of the Higgs-fermion-fermion coupling which essentially governs the scale dependence of fermion mass. At the one loop level the expression is gauge invariant and involves only the representation content of left- and right-handed fermions but not that of Higgs. The corresponding expression for supersymmetric theories is also given. Some applications of these formulas are presented. In Chapter III, the production and the subsequent decays of a heavy lepton pair L^{+-}near the Z peak in e^{+}e^{-}annihilation are considered as a test of the standard model. The longitudinal polarization is derived from the spin-dependent production cross-section, and the decays L→ πν and L→lνν are used as helicity analyzersPrimary Subject

Source

1982; 111 p; University Microfilms Order No. 83-12,864; Thesis (Ph. D.).

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Report

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Thesis/Dissertation

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BOSONS, ELECTROMAGNETIC INTERACTIONS, ELECTRON-NEUTRON INTERACTIONS, ELECTRON-POSITRON INTERACTIONS, FERMIONS, GAUGE INVARIANCE, HEAVY LEPTONS, LEPTONS, MASS SPECTRA, NEUTRAL CURRENTS, NEUTRINOS, PIONS, STRONG INTERACTIONS, SUPERSYMMETRY, U-2 GROUPS, UNIFIED GAUGE MODELS, WEAK INTERACTIONS, WEAK PARTICLE DECAY

ALGEBRAIC CURRENTS, BASIC INTERACTIONS, CURRENTS, DECAY, ELECTRON-NUCLEON INTERACTIONS, ELEMENTARY PARTICLES, FIELD THEORIES, HADRONS, INTERACTIONS, INVARIANCE PRINCIPLES, LEPTON-BARYON INTERACTIONS, LEPTON-HADRON INTERACTIONS, LEPTON-LEPTON INTERACTIONS, LEPTON-NUCLEON INTERACTIONS, LIE GROUPS, MASSLESS PARTICLES, MATHEMATICAL MODELS, MESONS, PARTICLE DECAY, PARTICLE INTERACTIONS, PARTICLE MODELS, POSTULATED PARTICLES, PSEUDOSCALAR MESONS, QUANTUM FIELD THEORY, SPECTRA, SYMMETRY, SYMMETRY GROUPS, U GROUPS

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AbstractAbstract

[en] The quantum expectation values in a four-dimensional Yang-Mills theory are represented in each topological sector as expectation values over the diffusion which develops in the ''fourth'' Euclidean time. The Langevin equations of this diffusion are stochastic duality equations in the A

_{4}= 0 gaugePrimary Subject

Source

Cover-to-cover translation of Pis'ma v Zhurnal Ehksperimental'noj i Teoreticheskoj Fiziki (USSR).

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Journal Article

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JETP Letters; ISSN 0021-3640; ; v. 38(9); p. 565-569

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AbstractAbstract

[en] We have studied the six-quark system in a nonrelativistic quark model which incorporates some of the features expected from chromodynamics. Using a large basis space which includes color, spin, and orbital excitations, and a Hamiltonian completely determined by previous studies of baryon structure, we derive a number of the features of low-energy nuclear physics. Among our findings are (1) a strong dynamical clustering of the 3u-3d system into a neutron-proton configuration and (2) an effective nucleon-nucleon potential with a strong repulsive core and an intermediate-range attraction similar to those of semiphenomenological potentials. When supplemented with a reasonable model for one-pion exchange, this effective potential gives a good account of the properties of the deuteron

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Secondary Subject

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Journal Article

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Physical Review. D, Particles Fields; ISSN 0556-2821; ; v. 29(5); p. 952-977

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ANGULAR MOMENTUM, BOSON-EXCHANGE MODELS, CHARGED PARTICLES, COMPOSITE MODELS, ELEMENTARY PARTICLES, FERMIONS, FIELD THEORIES, HADRONS, INTERACTIONS, MATHEMATICAL MODELS, MATHEMATICAL OPERATORS, OBE MODEL, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PROPERTIES, PERIPHERAL MODELS, POTENTIALS, QUANTUM FIELD THEORY, QUANTUM OPERATORS

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AbstractAbstract

[en] We study the nonlinear and long-term stability of a constant E field in a Yang-Mills theory by examining the class of solutions discovered by Baseyan et al. Using adiabatic invariance, we are able to relate the long-term behavior of the solution to that of an iterative map. We find that the solution is usually chaotic and goes through an endless sequence of seemingly random flips of dominant isospin directions. By a proper choice of initial conditions, we are able to construct two classes of non-self-dual (presumably unstable) periodic solutions. We present the first-few solutions graphically

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Journal Article

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Physical Review. D, Particles Fields; ISSN 0556-2821; ; v. 29(2); p. 259-268

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[en] It is shown that two of the three subtraction constants in the general dispersion representation for a three-point function are equal to zero. This simplifies the representation so that it formally coincides with a single dispersion representation for two-point functions and generates the same sum rules. It is shown that after a single Borel transformation the parasitic contribution to the double spectral density is not suppressed exponentially, but only as a power

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Source

Cover-to-cover translation of Yadernaya Fizika (USSR).

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Journal Article

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Soviet Journal of Nuclear Physics; ISSN 0038-5506; ; v. 37(6); p. 958-959

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[en] Numerical results to the Higgs scalar equation and the sine-Gordon equation with cylindrical symmetry are reported. Two separated energy regions are found where a Higgs kink develops into pulsons when reaching the origin r = 0, while only for higher energies a reflection is observed. The pulsons to both equations are studied in detail by modifying the initial kink shapes. In comparison with the spherical pulsons the cylindrical ones are extremely long-lived. For amplitudes slightly below half the distance between two (neighboured) vacua of the theories no decrease of the amplitudes and no perceivable radiation have been obtained by the numerical solution, examined during a time of order 1000. On the other hand, 'heavy' sine-Gordon pulsons (with amplitudes 3π approx. 4π) are found to decay fast during a time t approx. 100 in cylindrical symmetry. (Auth.)

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Journal Article

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Physica Scripta; ISSN 0031-8949; ; v. 29(5); p. 431-434

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[en] A detailed discussion of certain exact solutions, in vacuum, of our recently proposed equations for Poincare gauge field theory is presented. The construction of the solutions involves ansatze and methods well-known in Instanton Physics. (Author)

[pt]

Apresenta-se uma discussao mais detalhada de uma certa classe de solucoes exatas, no vazio, das equacoes propostas recentemente para a teoria de calibre do grupo de Poincare. A construcao das solucoes se baseia sobre hipoteses e metodos bem conhecidos na fisica dos Instantons. (Autor)Primary Subject

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Journal Article

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Revista Brasileira de Fisica; ISSN 0374-4922; ; v. 13(2); p. 270-279

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Schroedinger, E.

Oesterreichische Akademie der Wissenschaften, Vienna

Oesterreichische Akademie der Wissenschaften, Vienna

AbstractAbstract

[en] Schroedinger invested a great amount of energy in his GUT (General Unitary Field Theory) but finally lost interest. Only the seed, planted by him, finally bears fruit someplace else. At first his main interest was the phenomenological electrodynamics. Here he gave several contributions and he was a zealous defender of theories on the nature of electricity which went back to Faraday and Maxwell. Already in 1917 Schroedinger pointed out that energy and momentum of the gravitiational field could be transformed away and interpreted in another paper the Einstein-de Sitter-space. A field where he could show his handicraft, was the Born-Infeld nonlinear electrodynamics. He finds a new variational principle and he constructs exact wavelike solutions. The speculations and publications of Eddington made a big impression on him and influenced some popular papers. The presentations, however, prove that Schroedinger had the right intuition on the Fermi-statistics. A series of papers on proper vibrations of the universe show his priority that particles should be produced in the expanding cosmos. Only in the forties did Schroedinger devote himself to further generalize the general theory of relativity in order to include more interactions in a long series of papers. He looked upon the affine connection as a primary quantity and thus got to a theory with torsion. Probably he was the first to have endeavoured to include the meson field into a unitary field theory. Towards the end of his life did he show that the coupling of the longitudinal photon continuously disappears with μ. In connection with this question he once again almost hit upon one of the most fruitful discoveries of the later field theory, the so-called 'Higgs-mechanism'. He understood on a classical level that the electromagnetic current is proportional to the vector potential, if one couples a complex scalar field to the electromagnetic one. He first pointed out that in this way the relativistic London equations came into being and the photon acquires a mass. 50 papers on field theory are a goldmine of ideas, the germ of many later developments can be found in this volume. (W.K.)

Original Title

Erwin Schroedinger: Gesammelte Abhandlungen Band 2. Beitraege zur Feldtheorie

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Source

1984; 699 p; Verlag der Oesterreichischen Akademie der Wissenschaften; Wien (Austria); ISBN 3 7001 05754; ; 50 papers of the years 1910-1956. Complete edition in 4 volumes: ISBN 3 7001 05738 (Friedr. Vieweg Verlag Braunschweig/ Wiesbaden: ISBN 3-528-07135-4; V. 2: ISBN 3-528-07132-X).

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Book

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Bibliography

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[en] Galilean gauge theories are characterized by constraints which are compatible only with the zero-momentum mode of the gauge fields. These theories are quantized according to the Dirac theory of constrained systems and are explicitly formulated in terms of the canonical variables. (orig.)

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Journal Article

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Phys. Lett., B; ISSN 0370-2693; ; v. 137(5/6); p. 404-406

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[en] We compute the correlation length for the pure SU(3) lattice gauge theory by the long distance correlation method. We observe a scaling window, 4.7 < or approx. β < or approx. 5.6, and deduce a mass gap msub(g) = 320 Λ +- 15%. (orig.)

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Journal Article

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Phys. Lett., B; ISSN 0370-2693; ; v. 138(5/6); p. 410-412

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