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Two exercises in supersymmetry: a low-energy supergravity model and free string field theory

Description: The new features of a supersymmetric standard model in the presence of heavy families are studied. The minimal set of Higgs fields, the desert between the electroweak and the grand unification scale and perturbative values of the dimensionless parameters throughout this region are assumed. Using the numerical as well as the approximate analytic solution of the renormalization group equations, the evolution of all the parameters of the theory are studied in the case of large Yukawa couplings for… more
Date: September 1, 1986
Creator: Preitschopf, C.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Light composite fermions: an overview

Description: Some rules which have been proposed, including 't Hooft's anomaly conditions, decoupling conditions and tumbling versus no tumbling are discussed. Then mass generation mechanisms for composite fermions are covered, including weak gauging, strong gauging, and unification. The origin of the different generations of quarks and leptons is then considered. In the context of composite models, the three generations of quarks and leptons must appear in the first approximation as three sets of massless … more
Date: January 1, 1982
Creator: Raby, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiative corrections in SU/sub 2/ x U/sub 1/ LEP/SLC

Description: We show the sensitivity of various experimental measurements to one-loop radiative corrections in SU/sub 2/ x U/sub 1/. Models considered are the standard GSW model as well as extensions of it which include extra quarks and leptons, SUSY and certain technicolor models. The observation of longitudinal polarization is a great help in seeing these effects in asymmetries in e/sup +/e/sup -/ ..-->.. ..mu../sup +/..mu../sup -/, tau/sup +/tau/sup -/ on Z/sup 0/ resonance. 25 refs., 22 figs., 10 tabs.
Date: June 1, 1985
Creator: Lynn, B. W.; Peskin, M. E. & Stuart, R. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Neutrino mixing and oscillation in a grand unified field theory SO(10)

Description: The investigation shows that it is very difficult to achieve neutrino mixing of other than the V/sub ..mu../-..nu../sub tau/ type in any minimal SO(10) model in which neutrino masses are generated by the Gell-Mann-Ramond-Slansky mechanism, because of the severe constraints placed on the mass matrix by quark phenomenology.
Date: January 1, 1980
Creator: Tanaka, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Making sense of anomalous gauge theories

Description: An anomalous gauge theory is defined here as a gauge theory in which the field equation is inconsistent and gauge invariance is lost. A conventional approach to anomalous gauge theories, that of adjusting the fermion content so the anomaly vanishes, is discussed, followed by a mathematically coherent frame for anomalies. 10 refs. (LEW)
Date: September 1, 1985
Creator: Jackiw, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Weak interaction effects in e/sup +/e/sup -/ annihilation with polarised beams

Description: Although the standard gauge model of weak and electromagnetic interactions based on the work of Salam and Weinberg has met with great success, there are experimental facts that will require its extension or its modification to a new gauge model; the discovery of a heavy lepton at SLAC and the absence of parity violation in atoms that is expected from the neutral weak current coupling to electrons are discussed. Three tests are proposed that bear on these questions. First, heavy lepton productio… more
Date: November 2, 1977
Creator: Simard, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CP violation

Description: Predictions for CP violation in the three generation Standard Model are reviewed based on what is known about the Cabibbo-Kobayashi-Maskawa matrix. Application to the K and B meson systems are emphasized. 43 refs., 13 figs.
Date: December 1, 1989
Creator: Gilman, Frederick J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Spontaneous breaking of supersymmetry

Description: There has been recently a revival of interest in supersymmetric gauge theories, stimulated by the hope that supersymmetry might help in clarifying some of the questions which remain unanswered in the so called Grand Unified Theories and in particular the gauge hierarchy problem. In a Grand Unified Theory one has two widely different mass scales: the unification mass M approx. = 10/sup 15/GeV at which the unification group (e.g. SU(5)) breaks down to SU(3) x SU(2) x U(1) and the mass ..mu.. appr… more
Date: December 1, 1981
Creator: Zumino, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Calculability of the n-p mass difference in gauge theories

Description: The requirement of a calculable n-p mass difference leads to a consideration of unified gauge theories. Future developments in grand unified models may provide a realistic framework for the calculation of the n-p mass difference. The possibility that the relatively soft ultraviolet behavior of QCD softens the divergence in the lowest-order electromagnetic mass shift is considered in detail. It is shown that, if the bare mass and QCD coupling are constrained to be independent of the electromagne… more
Date: January 1, 1980
Creator: Kiskis, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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CP violation in the B system: Physics at a high luminosity B Factory

Description: CP Violation remains one of the unsolved puzzles in particle physics. Measurements of CP violating asymmetries in {beta} meson decay will test the Standard Model of electro-weak interactions and tell whether this phenomenon can be explained simply through the non-zero angles and phase in the CKM matrix. A high luminosity, energy asymmetric e{sup +}e{sup {minus}} storage ring provides the most versatile and best opportunity to measure CP violating effects and to test the consistency of the Stand… more
Date: June 1, 1991
Creator: Lueth, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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KMC unitarity and K/sup +/ yields. pi. /sup +/. nu. anti. nu

Description: Experimental constraints on the Kobayashi-MaskawaCabibbo (KMC) matrix are surveyed and shown to provide a test of the standard model at the level of its O (..cap alpha..) radioactive corrections. The three generation prediction BR (K/sup +/ ..-->.. ..pi../sup +/..nu..) approx. = (0.35 approx. 3) x 10/sup 10/ is reviewed and the potential for enhancement up to approx. = 3 x 10/sup -9/ due to the fourth generation mixing is described. 19 refs.
Date: June 1, 1986
Creator: Marciano, William J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Research program in elementary particle theory. Progress report for period ending June 30, 1980. [Syracuse Univ]

Description: The High Energy Theory Group at Syracuse conducted basic research in several areas of current interest. A great deal of progress was made in the understanding of systems with unusual topological properties. A variational formulation of the equations that govern spinning particles in general relativity was accomplished. Perturbative as well as nonperturbative properties (incorporated in an effective Lagrangian) of quantum chromodynamics aspects were investigated. The question concerning gauge fi… more
Date: January 1, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research at LAMPF

Description: During the past decade, both the science program and the experimental facilities at LAMPF have undergone some significant changes. This report is a concise description of the current research initiatives and of new directions being proposed for the future research program at LAMPF. Traditionally the LAMPF physics program has explored nuclear systems with hadronic probes: pions, protons, and neutrons. In recent years the exploitation of the intense lepton beams -- neutrinos and muons -- at LAMPF… more
Date: February 1, 1992
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Higgs hunting

Description: The phenomenology of the Higgs boson in the standard SU(2) x U(1) electroweak model is reviewed. We compare signatures and cross sections for various Higgs production mechanisms: (1) toponium radiative decay (xi ..-->.. H/sup 0/..gamma..); (2) gluon gluon fusion (gg ..-->.. H/sup 0/); (3) Compton-like process (gc ..-->.. H/sup 0/c); and (4) bremsstrahlungs at Z/sup 0/ resonance. It is argued that new detection techniques for heavy particle identification could be helpful in triggering the rare … more
Date: January 1, 1982
Creator: Keung, W.Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Unification of Yang-Mills theory and supergravity in ten dimensions

Description: We show how to generalize the coupling of n=1 super-Maxwell theory and n=1 supergravity in 10-dimensions to the case of a non-abelian gauge group. We find that the supergravity 2-form potential a/sub ..mu nu../ is coupled to the Yang-Mills gauge potential A/sub ..mu../ via the Chern-Simons 3-form.
Date: August 1, 1982
Creator: Chapline, G.F. & Manton, N.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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GUTs, SUSY GUTs and SUPER GUTs

Description: We review the motivations for extending grand unified theories with particular emphasis on supersymmetry and its phenomenological and cosmological fallout, and comment on the relevance of quantum gravity. 67 references.
Date: July 1, 1982
Creator: Gaillard, M. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Unification through a supergroup

Description: The representations of supergroups provide the most precise fit to the known set of fundamental physical matter fields SU (2/1) describes the unified weak-electromagnetic interactions and SU(5 + k/1) contains SU(3) color and 2/sup k/exact generations. Moreover, SU(2/1) predicts that the 4th states of the lepton multiplets (i.e. ..nu../sub R//sup 0/) decouple, whereas they don't in quark multiplets, and SU(n/1) predicts that the color degree of freedom is an SU(3). All relevant constructions are… more
Date: January 1, 1980
Creator: Ne'eman, Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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CP violation without elementary scalar fields

Description: Dynamically broken gauge theories of electroweak interactions provide a natural mechanism for generating CP violation. Even if all vacuum angles are unobservable, strong CP violation is not automatically avoided. In the absence of strong CP violation, the neutron electric dipole moment is expected to be of order 10/sup -24/e cm.
Date: April 1, 1980
Creator: Eichten, E.; Lane, K. & Preskill, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resonant enhancement of flavor-changing neutrino interactions

Description: The resonant amplification of neutrino oscillations in the presence of flavor-changing neutrino interactions with matter is analyzed. It is shown that a significant {mu}-flavor conversion can take place even in the absence of neutrino mixing in vacuum. To account for the solar neutrino deficit, the strength of the new interactions should be {approximately} 10{sup {minus}2}G{sub F} and the resulting neutrino suppression and spectrum is similar to that in the ordinary MSW effect. I discuss some e… more
Date: October 1, 1991
Creator: Roulet, E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Prospects for electroweak parameter measurements at CDF

Description: The 4 pb{sup {minus}1} of 1.8 TeV {bar p}p collisions accumulated by the collider Detector at Fermilab (CDF) have allowed various measurements of electroweak parameters. Three years from now results should be forthcoming on a sample of about 80 pb{sup {minus}1} which, in the likely context of that time, will still be quite significant.
Date: January 1, 1991
Creator: Nodulman, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Monopole catalysis: an overview

Description: A summary of the talks presented in the topological workshop on monopole catalysis at this conference is given. We place special emphasis on the conservation laws which determine the allowed monopole-fermion interactions and on catalysis as a probe of the structure of a grand unified theory. 11 references.
Date: November 1, 1983
Creator: Dawson, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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