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Heavy mass states

Description: The indirect evidence for the production of a heavy lepton and direct evidence for the product of a new hadronic state or states in proton-proton interactions is considered for the interpretation requiring the existence of two more leptons and two new quarks. It is shown that such a picture is consistent and in good agreement with existing data. The new structure is located at M = 9.54 GeV/c/sup 2/ and is much wider than the experimental resolution. Also it is asymmetric, suggesting the presenc… more
Date: August 23, 1977
Creator: Paschos, E. A.
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.
Partner: UNT Libraries Government Documents Department
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Absolute polarization standards at medium and high energies. [200 to 900 MeV]

Description: Although measurement of a polarization asymmetry is rather easy, the normalization of the measurement to obtain the analyzing power requires an absolute knowledge of the beam polarization or comparison with a known standard analyzing power. Such calibration standards can be hard to find. This paper concentrates on medium and higher energies, and divides the techniques into four categories: double scattering, polarized target methods, polarized source methods, and theoretical methods. Secondary … more
Date: January 1, 1980
Creator: McNaughton, M.W.
Partner: UNT Libraries Government Documents Department
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Observation of tilt asymmetries in field-reversed configurations

Description: In recent years, part of the experimental effort on the FRX-C/LSM device has been devoted to understanding why good FRC confinement is observed only in a narrow window of the operating parameter space (fill pressures less than 5 mtorr and bias fields less than 0.8--0.9 kG). The transition from good to bad confinement has been shown for some time to correlate with strong axial shocks, suggesting a formation or stability problem. More recently, FRC magnetic asymmetries have been observed whenever… more
Date: January 1, 1989
Creator: Tuszewski, M.; Barnes, D. C.; Klingner, P. & Ng, Chun
Partner: UNT Libraries Government Documents Department
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Photoemission from solids: the transition from solid-state to atomic physics

Description: As the photon energy is increased, photoemission from solids undergoes a slow transition from solid-state to atomic behavior. However, throughout the energy range h..nu.. = 10 to 1000 eV or higher both types of phenomena are present. Thus angle-resolved photoemission can only be understood quantitatively if each experimenter recognizes the presence of band-structure, photoelectron diffraction, and photoelectron asymmetry effects. The quest for this understanding will build some interesting brid… more
Date: August 1, 1980
Creator: Shirley, D.A.
Partner: UNT Libraries Government Documents Department
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Summary of spin session talks

Description: Measurements of spin observables in scattering experiments have been useful to explore a wide variety of medium and high energy phenomena. Important new results were presented in each of the spin, combined hadron/spin and combined electrons and muons/spin sessions at this conference. Talks concerning spin effects in other sessions and in one of the hadron/spin parallel sessions are summarized by other speakers. The spin talks summarized in this paper are divided into four topics: tests of symme… more
Date: January 1, 1991
Creator: Spinka, H.
Partner: UNT Libraries Government Documents Department
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(High energy physics)

Description: An intense analysis effort on the data we obtained in a seven month run on E704 last year has produced a flood of new results on polarization effects in particle production at 200 GeV/c. We are fortunate to be able to report in detail on those results. Our other Fermilab experiment, E683 (photoproduction of jets) has been delayed an unbelievable amount of time by Fermilab schedule slippages. It was scheduled and ready for beam two years ago As this report is being written, we have been running … more
Date: September 1, 1991
Creator: Bonner, B. E. & Roberts Jr., J. B.
Partner: UNT Libraries Government Documents Department
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Angular distributions of photoelectrons and non-thermal photoions from atoms and molecules. [Review]

Description: During the last ten years, photoelectron angular distributions have been used extensively to study the dynamics of the photoionization process in atoms and molecules. Some major advances in this body of work are reviewed with special emphasis on results emerging since the last Conference on VUV Radiation Physics three years ago. By far the greatest progress has occurred for atoms, where interest is focussed on improving zero-order (Hartree-Slater, Cooper-Zare) understanding of the asymmetry par… more
Date: January 1, 1977
Creator: Dehmer, J. L.
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.
Partner: UNT Libraries Government Documents Department
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Tensor analyzing powers in the /sup 1/H(d vector,pp)n reaction at 16 MeV. I. The symmetric, constant-relative-energy configurations

Description: Experimental results for the tensor analyzing powers A/sub xx/ and A/sub yz/ in the /sup 1/H(d-vector, pp)n reaction at 16 MeV for a series of symmetric, constant-relative-energy configurations are reported and compared with the results of recent Faddeev calculations using a separable NN potential. In general, the agreement seems fairly good, although there is some evidence that the measured values of A/sub yz/ tend to be slightly smaller than the prediction, whereas for A/sub xx/ the opposite … more
Date: January 1, 1980
Creator: Correll, F.D.; Ohlsen, G.G.; Brown, R.E.; Hardekopf, R.A.; Jarmie, N.; Schwandt, P. et al.
Partner: UNT Libraries Government Documents Department
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/sup 194/ /sup 196/ /sup 198/Pt(t,. cap alpha. )/sup 193/ /sup 195/ /sup 197/Ir reactions with polarized tritons. [17 MeV]

Description: The /sup 194/ /sup 196/ /sup 198/Pt(t vector, ..cap alpha..)/sup 193/ /sup 195/ /sup 197/Ir reactions were measured. Angular distributions of cross sections and analyzing powers for levels up to approx. 2.5 MeV in each residual nuclide were obtained, and comparisons with DWBA predictions allowed spins, parities, and pickup spectroscopic strengths to be determined. The results are being analyzed with the aim of testing the existence of supersymmmetric structures in nature. 2 figures.
Date: January 1, 1980
Creator: Cizewski, J. A.; Flynn, E. R.; Sunier, J. W.; Brown, R. E. & Burke, D. G.
Partner: UNT Libraries Government Documents Department
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Analyzing-power formalism for three-body final states

Description: Various relations important for extraction of analyzing powers from data on reactions involving three particles in the final state were derived. Several of the results pertinent for spin-1/2 and spin-1 polarized beams are presented here. These may be used in analysis of the /sup 1/H(d-vector,pp)n reaction. 3 figures. (RWR)
Date: January 1, 1980
Creator: Ohlsen, G.G.; Brown, R.E.; Correll, F.D. & Hardekopf, R.A.
Partner: UNT Libraries Government Documents Department
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W mass and W asymmetry at CDF

Description: The lepton charge asymmetry from W decaying into a lepton and a neutrino is discussed (preliminary result). This measurement gives information on parton distribution functions at low x values. The derivation of the recently published W mass value of 79.91 {plus minus} 0.39 GeV/c{sup 2} is also presented. M{sub W} is used to set an upper limit on the top quark mass. 13 refs., 4 figs., 1 tab.
Date: May 1, 1991
Creator: Leone, S. (Pisa Univ. (Italy) Istituto Nazionale di Fisica Nucleare, Pisa (Italy))
Partner: UNT Libraries Government Documents Department
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Quantitative analysis of bidirectional electron fluxes within coronal mass ejections at 1 AU

Description: The solar wind electron heat flux is carried primarily by suprathermal halo'' electrons beamed antisunward along the interplanetary magnetic field (IMF), indicating magnetic connection to the Sun only in one direction. However, electron observations at 1 AU show that counterstreaming halo beams, suggesting closed magnetic structures, prevail within coronal mass ejections (CMEs). These structures might be magnetic tongues'', tied to the Sun at both ends, magnetically detached plasmoids, or compl… more
Date: January 1, 1991
Creator: Phillips, J.L.; Gosling, J.T.; McComas, D.J.; Bame, S.J. & Feldman, W.C.
Partner: UNT Libraries Government Documents Department
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Low Energy Ring issues

Description: The Low Energy Ring (LER) in an Asymmetric B Factory is always too large in circumference. The requirements for the LER in a B Factory are developed, including, damping, emittance and power density, and some examples of technical solutions are given. The main emphasis is on ensuring flexibility of operation.
Date: April 1, 1992
Creator: Hutton, A.
Partner: UNT Libraries Government Documents Department
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Thermal and quantal isospin and spin fluctuations in heavy ion reactions

Description: The isobaric charge distributions are discussed in terms of quantal and classical isospin fluctuations. The roles of mass asymmetry and of the higher giant isovector modes are treated within the framework of a cylinder model that is worked out exactly. Spin fluctuations are considered first in terms of quantal fluctuations in a cylinder model and second in terms of thermal fluctuations in a two-sphere model. The results are applied to the calculation of in- and out-of-plane angular distribution… more
Date: January 1, 1980
Creator: Moretto, Luciano G.
Partner: UNT Libraries Government Documents Department
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Particle identification at an asymmetric B Factory

Description: Particle identification systems are an important component of any detector at a high-luminosity, asymmetric B Factory. In particular, excellent hadron identification is required to probe CP violation in B{sup 0} decays to CP eigenstates. The particle identification systems discussed below also provide help in separating leptons from hadrons at low momenta. We begin this chapter with a discussion of the physics motivation for providing particle identification, the inherent limitations due to int… more
Date: September 1, 1991
Creator: Coyle, P.; Eigen, G.; Hitlin, D.; Oddone, P.; Ratcliff, B.; Roe, N. et al.
Partner: UNT Libraries Government Documents Department
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m/sup +/SR studies on pure MnF/sub 2/ and site-diluted (Mn/sub 0. 5/Zn/sub 0. 5/)F/sub 2/

Description: Positive muon spin rotation and relaxation measurements have been carried out on the antiferromagnets, pure MnF/sub 2/ and site-diluted (Mn/sub 0.5/Zn/sub 0.5/)F/sub 2/, above and below the Neel temperature T/sub N/ using single-crystal specimens. Two different muon signals have been found in the pure MnF/sub 2/; with the precession frequency nu/sub A/ = 1.3 GHz for the site A and nu/sub B/ = 152 MHz for the site B measured in zero external magnetic field at T = 5 K. We propose a picture that t… more
Date: January 1, 1986
Creator: Uemura, Y.J.; Keitel, R.; Senba, M.; Kiefl, R.F.; Kreitzman, S.R.; Noakes, D.R. et al.
Partner: UNT Libraries Government Documents Department
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Recent results from Mark II at SPEAR and PEP

Description: Three results are presented: (1) The semi-leptonic branching ratio of the ..lambda../sub c/ has been measured at SPEAR to be B(..lambda../sub c//sup +/ ..-->.. e/sup +/X) = (4.5 +- 1.7)%. (2) Properties of tau-pair production have been measured at PEP at square root S = 29 GeV: sigma/sup tau tau//sigma/sup QED/ = 0.97 +- 0.05 +- 0.06; the forward-backward asymmetry is A/sub tau tau/ = (-3.5 +- 5.0)%; inclusive branching ratios are B(tau ..-->.. 1 Prong) = (86 +- 4)%, B(tau ..-->.. 3 Prongs) = (… more
Date: April 1, 1982
Creator: Strait, J.
Partner: UNT Libraries Government Documents Department
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Polarized target experiment at Fermilab. [Polarization, 100 GeV]

Description: Preliminary results are given for polarization measurements for ..pi../sup +/p and ..pi../sup -/p elastic scattering at 100 GeV. Results are not yet given for pp scattering also studied. It is noted that strictly speaking it is the asymmetry in the scattering off polarized protons that is measured. One relies on time-reversal invariance when this asymmetry is termed polarization. The values of the polarization are everywhere very small at this energy. These results appear to show no significant… more
Date: January 1, 1977
Creator: Chamberlain, O.
Partner: UNT Libraries Government Documents Department
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Diffusion model predictions for kinetic energy, mass, angular distributions, and. gamma. -ray multiplicities in heavy ion induced reactions

Description: In the present formalism the diffusion along the mass asymmetry coordinate has been generalized by refining the treatment of the radial and angular motion necessary for an adequate reproduction of the kinetic energy and angular distributions. The radial potential is used to evaluate the radial force. The interaction time and the average penetration for each l-wave are estimated. The diffusion calculation is then carried out for the duration of the interaction time. The angular rotation during d… more
Date: August 1, 1977
Creator: Moretto, Luciano G.
Partner: UNT Libraries Government Documents Department
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Analyzing powers for the three-nucleon breakup reaction /sup 1/H(d vector,p)pn at 16 MeV

Description: Analyzing powers for the /sup 1/H(d,p)pn reaction were measured at 16.0 MeV and beam polarization of approximately 0.82. Similar data for the elastic scattering /sup 1/H(d,p)/sup 2/H were also taken. The breakup analyzing power A/sub xz/, which attains the largest magnitude, is shown as a function of excitation energy. Angular distributions of elastic and breakup analyzing powers are compared; large differences are noted for A/sub xx/ and A/sub xz/. It is found that 1-MeV energy bins are too la… more
Date: January 1, 1980
Creator: Brown, R.E.; Ohlsen, G.G.; Correll, F.D.; Hardekopf, R.A. & Jarmie, N.
Partner: UNT Libraries Government Documents Department
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Symmetry and Coulomb corrections in light nuclear systems. [Below 20 MeV]

Description: An approximation that describes the Coulomb-nuclear interference in a two-body manner is used to calculate vector analyzing powers in elastic p-d scattering and phase shifts for p-..cap alpha.. scattering. Comparison with experiments indicates that a good deal of the observed differences in charge-symmetric three- and five-nucleon reactions can be covered by Coulomb interference effects. Calculations for the four-nucleon system confirm this observation. It appears to be questionable that nuclea… more
Date: January 1, 1980
Creator: Zankel, H.
Partner: UNT Libraries Government Documents Department
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