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in subjects: "Supersymmetry"

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

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: Report

Partner: UNT Libraries Government Documents Department

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Radiative corrections in SU/sub 2/ x U/sub 1/ LEP/SLC

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: Article

Partner: UNT Libraries Government Documents Department

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Gaugino masses in superstring inspired models

Contributions to the masses of the gauginos in models arising as low energy limits of superstring theories are considered.

Date: August 1, 1986

Creator: Dawson, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Spontaneous breaking of supersymmetry

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: Article

Partner: UNT Libraries Government Documents Department

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Supergravity and inflation

The reasons that led to study supersymmetric models in the context of inflation are reviewed by setting up the constraints that candidates to an inflationary scenario must satisfy. The question is raised whether the groundstate of the new scalar field introduced, the inflaton, breaks supersymmetry. This is discussed in connection with the so-called thermal constraint. Some problems about the study of thermal fluctuations are discussed. The different models available are reviewed and the way the… more

Date: August 1, 1985

Creator: Binetruy, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Physics issues for the next linear collider

This article surveys the physics issues to be studied at future e{sup +}e{sup {minus}} colliders, especially in the energy region below 500 GeV. Particular emphasis is given to standard model studies -- precision measurements of the dynamical properties of W bosons and top quarks -- as well as the search for evidence of the Higgs sector.

Date: April 1, 1992

Creator: Peskin, M.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Supersymmetric statistical models on the lattice

SUSY models in statistical mechanics involve spinless fermions and form an ideal laboratory for latticization. Extension of SUSY relations to the lattice may clarify, as well, the question of their validity beyond perturbation theory. A non-linear approach to lattice SUSY is introduced by the assignment of coupled commuting and anticommuting variables to each lattice site. As a typical example we demonstrate a SUSY dimer Hamiltonian which generates lattice branched-polymers configurations. We s… more

Date: January 1, 1983

Creator: Shapir, Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Harmonic superspace formalism and the consistent chiral anomaly

The harmonic superspace formalism has been used to construct the consistent chiral anomaly in N = 1, d = 6 supersymmetric Yang-Mills thoery. The expressions of the gauge anomaly ..delta../sub s//sup phi/ and of the supersymmetric anomaly ..delta../sub SUSY//sup phi/ are given together with the consistent condition. 7 refs.

Date: August 1, 1986

Creator: Li, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proton decay: 1982

Employing the current world average ..lambda../sub MS/ = 0.160 GeV as input, the minimal Georgi-Glashow SU(5) model predicts sin/sup 2/theta/sub W/(m/sub W/) = 0.214, m/sub b//m/sub tau/ approx. = 2.8 and tau/sub p/ approx. = (0.4 approx. 12) x 10/sup 29/ yr. The first two predictions are in excellent agreement with experiment; but the implied proton lifetime is already somewhat below the present experimental bound. In this status report, uncertainties in tau/sub p/ are described and effects of… more

Date: March 4, 1982

Creator: Marciano, William J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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(Research in the theory of condensed matter and elementary particles. ) Progress report

Progress is summarized in these areas: a new formulation of two dimensional critical phenomena and string theory, supersymmetric critical phenomena and string compactification, conformal field theory on orbifolds, Gaussian models with twisted boundary conditions, modular invariance and supersymmetric critical phenomena, critical indices, conformal invariance, and current algebra, renormalization group fixed points and the string equation of motion, fermionic string field theory, N = 2 super Rie… more

Date: January 1, 1986

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Theoretical particle physics

We have carried out research in lattice gauge theory, superstring theory, supersymmetry, the solar neutrino puzzle, QCD perturbation theory, and phenomenological models of hadrons. In this report, we summarize our work in each of these areas.

Date: April 1, 1992

Creator: Gottlieb, S.A.; Hendry, A.W.; Kostelecky, V.A. & Lichtenberg, D.B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Z yields jets+. gamma. as a signal for R-parity violation

Supersymmetric models with explicit R-parity violation can induce new rare decay modes of the Z boson into single supersymmetric particles. Here, the rate and signature for one such decay, Z {yields} {tilde {upsilon}} {gamma}, is examined, where it is found that the rate is at least an order of magnitude smaller than that for the process Z{yields} H{gamma}, even with larger values of the R-parity violating couplings.

Date: February 1, 1992

Creator: Hewett, J.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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SSC physics signatures and trigger requirements

Strategies are considered for triggering on new physics processes on the environment of the SSC, where interaction rates will be very high and most new physics processes quite rare. The quantities available for use in the trigger at various levels are related to the signatures of possible new physics. Two examples were investigated in some detail using the ISAJET Monte Carlo program: Higgs decays to W pairs and a missing energy trigger applied to gluino pair production. In both of the examples … more

Date: January 1, 1985

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Does the photino decay

The stability of the lightest superpartner is a crucial aspect of many experimental searches for supersymmetry and of supersymmetric dark matter candidates. It is shown that R parity may occur in operators of dimension four or less as an accidental consequence of an exact Z/sub N/ symmetry. In this case the lightest superpartner can decay via higher dimension operators. The lifetime depends on the scale of the new physics responsible for the non-renormalizable operators; it could be anywhere in… more

Date: August 29, 1986

Creator: Hall, L.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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GUTs, SUSY GUTs and SUPER GUTs

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: Article

Partner: UNT Libraries Government Documents Department

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Exotic signatures from supersymmetry

Minor changes to the standard supersymmetric model, such as soft flavor violation and R parity violation, cause large changes in the signatures. The origin of these changes and the resulting signatures are discussed. 15 refs., 7 figs., 2 tabs.

Date: August 1, 1989

Creator: Hall, L. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Resonant enhancement of flavor-changing neutrino interactions

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: Article

Partner: UNT Libraries Government Documents Department

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(Topics in theoretical physics). Progress report

Progress is reported in these areas: supersymmetry and conformal invariance and new structures in two dimensional critical phenomena; spinor fields and new applications and techniques for studying Ising model correlation factors; superstring compactification and high energy physics applications for novel two dimensional critical points; ordered and disordered spatial structure in dynamical systems; and fermion-boson mass relations in BCS type theories. Research is proposed in covariant formulat… more

Date: January 1, 1985

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Supercollider physics

The physics that can be explored with multi-TeV supercolliders is reviewed, including parton distributions, hadron jet production, the standard electroweak theory and minimal extensions to it, technicolor, supersymmetry, and compositeness. 19 refs., 11 figs. (LEW)

Date: March 1, 1985

Creator: Quigg, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Research in elementary particle physics. Technical progress report, May 1, 1979-May 29, 1980. [Dept. of Physics, Brandeis Univ. , Waltham, Massachusetts, 5/1/79-5/29/80]

Experimental research during the period involved use of the BNL multiparticle spectrometer to study S=-2 production and charm and baryonium production. Comments on the program are offered, along with a brief discussion of work on particle detectors. Theoretical research concentrated on topics in effective field theories, quantum chromodynamics, supersymmetry, and Regge behavior in gauge theories. This report is administrative in nature, with no data. A publications list is included. (RWR)

Date: January 1, 1980

Creator: Kirsch, L.E. & Schnitzer, H.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Sequential internal supersymmetry

The supergroups SU(2/1), SU(5/1) and SU(5 = k/1) provide fitting classifications, unifying weak-electromagnetic, color, and sequential flavor, respectively.

Date: September 1, 1980

Creator: Ne'eman, Y, & Sternberg, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Beyond the supersymmetric standard model

The possibility of baryon number violation at the weak scale and an alternative primordial nucleosynthesis scheme arising from the decay of gravitations are discussed. The minimal low energy supergravity model is defined and a few of its features are described. Renormalization group scaling and flavor physics are mentioned.

Date: February 1, 1988

Creator: Hall, L.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A superstring theory underview

I give a brief survey of the current status of superstring phenomenology, with an emphasis on the (currently unrealized) possibility of obtaining model-independent results. 40 refs., 9 figs.

Date: November 1, 1989

Creator: Dixon, L. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Symplectic structure of isospin particles in Yang-Mills fields

Using Dirac's constraint analysis, we explore the Hamiltonian formalism of isospin particles in external Yang-Mills fields without kinetic and potential energy term. We consider an example of isospin particle in 't Hooft-Polyakov magnetic monopole field and discuss possible quantization condition of magnetic charge in terms of geometric quantization.

Date: January 1, 1992

Creator: Oh, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department