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in subjects: "Quantum Numbers"

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Status of conserved quantum numbers

The status of the conserved quantum numbers is discussed including the historical development, the kinds of conservation laws, empirical tests, and particle decays. 19 references. (JFP)

Date: January 1, 1977

Creator: Goldhaber, M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Inelastic Strong Interactions at High Energies. [Cross Sections, Field Theory]

A method permitting the calculation of inclusive and semi-inclusive cross sections at high energies starting from an arbitrary field theory was worked out. The method relies on a functional integral representation of the generating functional of inclusive cross sections and on the use of semiclassical methods. The inclusive cross section is proportional to the absolute square of the Fourier transform of a special soliton solution of the classical field equations in zeroth order semi-classical a… more

Date: October 20, 1977

Creator: Suranyi, P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Algebraic approaches to nuclear structure

The concept and application of algebraic models to nuclear structure is surveyed with emphasis on interpretations in terms of traditional geometric models. Recent studies relating to the relationship between {beta} and {gamma} vibrations in deformed nuclei, to the rigidity or softness of axial asymmetry, to signature splitting in octupole excitations, to O(6) quantum numbers and multi-phonon excitations, and to pseudo-SU(3) are discussed. 31 refs., 9 figs.

Date: January 1, 1991

Creator: Casten, R.F. (Brookhaven National Lab., Upton, NY (USA) Koeln Univ. (Germany, F.R.). Inst. fuer Kernphysik)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Delta, iota and other meson spectroscopies

This talk is given from the point of view of an experimentalist. Meson spectroscopy in the 1 to 3 GeV region is interesting because experiments exploring this region, in particular radiative psi decay, have found a rich structure of resonances too complicated to unravel with any one experiment, and not easily interpreted with any one theoretical model. None of the theoretical calculations predicting all kinds of interesting and exotic objects in this region is very convincing or reliable. Addit… more

Date: May 1, 1986

Creator: Lipkin, Harry J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A simplified unified Hauser-Feshbach/Pre-Equilibrium model for calculating double differential cross sections

A unified Hauser-Feshbach/Pre-Equilibrium model is extended and simplified. The extension involves the addition of correlations among states of different total quantum numbers (J and J') and the introduction of consistent level density formulas for the H-F and the P-E parts of the calculation. The simplification, aimed at reducing the computational cost, is achieved mainly by keeping only the off-diagonal terms that involve strongly correlated 2p-1h states. A correlation coefficient is introduc… more

Date: January 1, 1988

Creator: Fu, C.Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Time Reversal Violation

This talk briefly reviews three types of time-asymmetry in physics, which I classify as universal, macroscopic and microscopic. Most of the talk is focused on the latter, namely the violation of T-reversal invariance in particle physics theories. In sum tests of microscopic T-invariance, or observations of its violation, are limited by the fact that, while we can measure many processes, only in very few cases can we construct a matched pair of process and inverse process and observe it with suf… more

Date: January 27, 2009

Creator: Quinn, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Electron Density Measurements in the National Spherical Torus Experiment Detached Divertor Region Using Stark Broadening of Deuterium Infrared Paschen Emission Lines

Spatially resolved measurements of deuterium Balmer and Paschen line emission have been performed in the divertor region of the National Spherical Torus Experiment using a commercial 0.5 m Czerny-Turner spectrometer. While the Balmer emission lines, Balmer and Paschen continua in the ultraviolet and visible regions have been extensively used for tokamak divertor plasma temperature and density measurements, the diagnostic potential of infrared Paschen lines has been largely overlooked. We analyz… more

Date: April 27, 2007

Creator: Soukhanovskii, V A; Johnson, D W; Kaita, R & Roquemore, A L

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Les Houches Interface for BSM Generators

We propose to combine and slightly extend two existing 'Les Houches Accords' to provide a simple generic interface between beyond-the-standard-model parton-level and event-level generators. All relevant information--particle content, quantum numbers of new states, masses, cross sections, parton-level events, etc.--is collected in one single file, which adheres to the Les Houches Event File (LHEF) standard.

Date: January 23, 2008

Creator: Alwall, J.; Boos, E.; Dudko, L.; Gigg, M.; Herquet, M.; Pukhov, A. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Search for anti-neutrino induced muon+ e- events

The authors have examined 1200 interactions with visible energies greater than 7.5 GeV produced by an anti-neutrino beam in the Fermilab 15-foot bubble chamber filled with a light neon hydrogen mixture. They have found one event with a {mu}{sup +}e{sup -} and hadrons in the final state, but with no evidence of strange particle production. This event may be an example of dilepton production by an anti-neutrino interaction, but other interpretations are possible. With 90% confidence, they conclud… more

Date: April 1, 1976

Creator: Berge, J. F.; DiBianca, F. A.; Hanft, R.; Nezrick, F. A.; Scott, W. G.; Smart, Wesley M. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluated Decay Data for 206TI.

Evaluated decay data for the {sup 206}Tl nuclide are presented, including recommended values for the half-life, {beta}- and {gamma}-ray emission energies and probabilities. Data on X-ray radiations, Auger and conversion electron energies and emission probabilities are also tabulated. Carefully evaluated data for radioactive nuclides refer to complex nuclear level schemes and tables of numerical values, which quantify fundamental nuclear structure information such as level energies and quantum n… more

Date: January 3, 2007

Creator: Kondev, F. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Factorization and resummation for collinear poles in QCD amplitudes

We study the origin of subleading soft and collinear poles of form factors and amplitudes in dimensionally-regulated massless gauge theories. In the case of form factors of fundamental fields, these poles originate from a single function of the coupling, denoted G({alpha}{sub s}), depending on both the spin and gauge quantum numbers of the field. We relate G({alpha}{sub s}) to gauge-theory matrix elements involving the gluon field strength. We then show that G({alpha}{sub s}) is the sum of thre… more

Date: May 28, 2008

Creator: Dixon, Lance J.; Magnea, Lorenzo & Sterman, George

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Simple de Sitter Solutions

We present a framework for de Sitter model building in type IIA string theory, illustrated with specific examples. We find metastable dS minima of the potential for moduli obtained from a compactification on a product of two Nil three-manifolds (which have negative scalar curvature) combined with orientifolds, branes, fractional Chern-Simons forms, and fluxes. As a discrete quantum number is taken large, the curvature, field strengths, inverse volume, and four dimensional string coupling become… more

Date: January 7, 2008

Creator: Silverstein, Eva

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A Les Houches Interface for BSM Generators

Date: December 1, 2007

Creator: Alwall, J.; Boos, E.; Dudko, L.; Gigg, M.; Herquet, M.; Pukhov, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutral Currents - The Structure of the Coupling

The authors report here on latest results from an investigation of the form of the neutral current coupling in the inclusive channels {nu}{sub {mu}} + N {yields} {nu}{sub {mu}} + hadrons and {bar {nu}}{sub {mu}} + N {yields} {bar {nu}}{sub {mu}} + hadrons. The experiment was conducted by the Caltech-Fermilab group in October 1974. The data were taken in the Fermilab narrow band beam set to a mean secondary hadron energy of {+-} 170 GeV. The distributions of total energy, observed in the target … more

Date: May 1, 1976

Creator: Stutte, Linda & /Caltech

Item Type: Article

Partner: UNT Libraries Government Documents Department

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The Spin- and Angel-Resolved Photelectron Spectrometer

A spin- and angle-resolved x-ray photoelectron spectrometer for the study of magnetic materials will be discussed. It consists of a turntable with electron lenses connected to a large hemispherical analyzer. A mini-Mott spin detector is fitted to the output of the hemispherical analyzer. This system, when coupled to a synchrotron radiation source will allow determination of a complete set of quantum numbers of a photoelectron. This instrument will be used to study ferromagnetic, antiferromagnet… more

Date: May 8, 2007

Creator: Mankey, G J; Morton, S A; Tobin, J G; Yu, S W & Waddill, G D

Item Type: Article

Partner: UNT Libraries Government Documents Department

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New directions in elementary particle physics: p anti p from very low to very high energies

The review covers low energy anti pp physics including annihilation processes, the spectroscopy of baryonium states, quasinuclear states and their relation to baryonium, the spectroscopy of protonium, and access to the whole charmonium family. High energy anti pp physics is reviewed covering total cross section rise, the common shape of cross sections, real part of forward amplitude, particle production, quantum number excitation, high transverse momentum, and high mass lepton pair. Also review… more

Date: January 1, 1979

Creator: Jacob, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Family number non-conservation induced by the supersymmetric mixing of scalar leptons

The most egregious aspect of (N = 1) supersymmetric theories is that each particle state is accompanied by a 'super-partner', a state with identical quantum numbers save that it differs in spin by one half unit. For the leptons these are scalars and are called ''sleptons'', or scalar leptons. These consist of the charged sleptons (selectron, smuon, stau) and the scalar neutrinos ('sneutrinos'). We examine a model of supersymmetry with soft breaking terms in the electroweak sector. Explicit mixi… more

Date: August 1, 1987

Creator: Levine, M. J. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Statistical mechanics and field theory. [Path integrals, lattices, pseudofree vertex model]

Field theory methods are applied to statistical mechanics. Statistical systems are related to fermionic-like field theories through a path integral representation. Considered are the Ising model, the free-fermion model, and close-packed dimer problems on various lattices. Graphical calculational techniques are developed. They are powerful and yield a simple procedure to compute the vacuum expectation value of an arbitrary product of Ising spin variables. From a field theorist's point of view, t… more

Date: May 1, 1979

Creator: Samuel, S.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Glueballs in the reaction. pi. /sup -/p. -->. phi phi n

The BNL/CCNY group has observed and performed a partial wave analysis on 1203 (22 GeV) ..pi../sup -/p ..-->.. phi phi n events. The OZI suppression has been found to be almost completely broken down. The phi phi spectrum is found to be composed almost entirely of two new resonances, the g/sub T/(2160) and the g/sub T/(2320) with K/sup G/J/sup PC/ = 0/sup +/2/sup + +/. For g/sub T/ (2160), M = 2.16 +- 0.05 GeV, and GAMMA = 0.31 +- 0.07 GeV. For g/sub T/(2320), M = 2.32 +- 0.04, and GAMMA = 0.22 … more

Date: January 1, 1983

Creator: Lindenbaum, S. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Production of neutrinos and neutrino-like particles in proton-nucleus interactions. [400 GeV, cross sections]

An experimental search was performed to look for the direct production of neutrinos or neutrino-like particles, i.e., neutral particles which interact weakly with hadrons, in proton-nucleus interactions at 400 GeV incident proton energy. Possible sources of such particles include the semi-leptonic decay of new heavy particles such as charm, and the direct production of a light neutral Higgs particle such as the axion. The production of these particles has been inferred in this experiment by ene… more

Date: March 1, 1979

Creator: Dishaw, J.P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Prospects in lepton-flavor violation

The theoretical and experimental situation regarding lepton-flavor conservation is reviewed and upcoming experiments are described. It is concluded that future improvements in experimental sensitivities will require higher flux, higher quality muon and kaon beams.

Date: January 1, 1982

Creator: Hoffman, C.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Atomic orbital data for elements with atomic numbers 1 less than or equal to Z less than or equal to 103

Atomic orbital energies and radial expectation values are tabulated for the ground state electronic configuration of all elements with Z less than or equal to 103 and for all orbitals having principal quantum numbers n less than or equal to 8. These tables have been developed for use in a model of electronic excitation and ionization that requires orbital data for both the occupied and unoccupied orbitals. The wavefunctions were calculated by the Dirac-Hartree-Fock-Slater method, with a local e… more

Date: October 1, 1988

Creator: Kerley, G.I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Family problems

Even Grand Unified Theories may not explain the repetitive pattern of fermions in the Standard Model. The abysmal absence of dynamical information about these families is emphasized. The evidence that family quantum numbers exist, and are not conserved, is reviewed. It is argued that rare kaon decays may be the best means to obtain more information on this important question.

Date: January 1, 1984

Creator: Goldman, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Diproton resonances in the mass region 2100 to 2800 MeV. [Dispersion relations, scattering amplitude]

A striking energy dependence was observed in the difference between the p--p total cross sections for parallel and antiparallel longitudinal spin states, ..delta..sigma/sub L/ = sigma/sup Tot/(reverse ..-->..)-sigma/sup Tot/(double ..-->..). The structure appears around P/sub lab/ = 1.5 GeV/c where ..delta..sigma/sub L/ = -16.7 mb and is seen in sigma/sup Tot/(double ..-->..) rather than sigma/sup Tot/(reverse ..-->..). The experiments were performed at Argonne National Laboratory using a stand… more

Date: January 1, 1978

Creator: Akihiko, Y.

Item Type: Article

Partner: UNT Libraries Government Documents Department