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in subjects: "Lepton-Nucleon Interactions"

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Anomalous electron--muon and electron--hadron production in electron--positron annihilation. [Branching ratio l/sub h/. -->. charged hadron + 2. nu. ,. nu. + n. gamma. , tau. -->. nu. /sub tau/e/sup -/. nu. /sub e/sup -//,. nu. /sub tau/. mu nu. /sub. mu. /, rare modes, cross sections]

Results of studies of anomalous electron-muon and electron-hadron events produced in electron-positron annihilation are presented. The data for this work were obtained with a lead-glass counter system, which was added to one octant of the Stanford Linear Accelerator Center-Lawrence Berkeley Laboratory magnetic detector at the electron-positron storage ring SPEAR. The lead-glass counter system provides good electron identification for part of the magnetic detector. The events under study have tw… more

Date: April 1, 1978

Creator: Kwan, B. P.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Charge and angular distributions as well as sequential decay and. gamma. -ray emission in heavy ion collisions viewed in the light of the diffusion model

The hierarchy of the collective relaxation times in heavy ion reactions is briefly reviewed. An improved diffusion model is introduced and applied to interpret the fragment Z and angular distributions for some typical reactions. The equilibrium in the neutron-to-proton ratio as well as the sharing of the excitation energy between fragments is studied by a coincidence method which leads to the measurement of the charge, mass and mean number of nucleons emitted by each fragment. The final destiny… more

Date: August 1, 1977

Creator: Moretto, L. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A comparison of collider searches for new gauge bosons

We compare and contrast the search capabilities during the next decade of e{sup +}e{sup {minus}}, ep, and {bar p}p colliders for new neutral gauge bosons in several extended versions of the Standard Model. 7 refs., 3 figs., 1 tab.

Date: January 1, 1990

Creator: Hewett, J.L. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics) & Rizzo, T.G. (Wisconsin Univ., Madison, WI (USA). Dept. of Physics Iowa State Univ. of Science and Technology, Ames, IA (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Hadron physics at the new CW electron accelerators

Major trends of the physics program related to the study of hadron structure and hadron spectroscopy at the new high current, high duty cycle electron machines are discussed. It is concluded that planned experiments at these machines may have important impact on our understanding of the strong interaction by studying the internal structure and spectroscopy of the nucleon and lower mass hyperon states.

Date: January 1, 1990

Creator: Burkert, Volker D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Intermediate energy neutrino physics

Occasionally, our understanding of a situation in physics is apparently so clear that consequences of a particular experimental result can imply a substantial confrontation with our view of the physical world. The standard model of electroweak interactions is now so clear that a number of experimental consequences are precisely predicted. This seems like a delightful situation for experimenters, but the bad news is that the experiments on which the predictions rest are at least hard and certain… more

Date: January 1, 1987

Creator: White, D. Hywel

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Experimental Studies of Electromagnetic Properties of Few Body Systems

An overview is given of some recent and planned experiments which have or will substantially increase our knowledge of the electromagnetic properties of few body systems. Specific examples include the proton and neutron elastic form factors, the deuteron elastic form factors, deuteron threshold electrodisintegration and quasi-elastic scattering, deuteron photodisintegration, and finally measurements of cross sections in deep inelastic scattering from hydrogen, deuterium, and iron. 47 refs., 13 … more

Date: August 1, 1987

Creator: Bosted, P. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Heavy quark production by neutrinos and antineutrinos. [Quark-parton model, SU(2) x SU(2) x U(1) gauge group, 200 GeV]

The rate for producing t- and b-quarks in, respectively, neutrino and antineutrino interactions with nucleons are estimated. Experimental quark parton distribution functions, SU(2) x SU(2) x U(1) gauge group mixing angles, and threshold suppression through rescaling are used in the calculation. The ratios to total cross sections of b-quark production by anti nu, R/sub b//sup anti nu/, and t-quark production by ..nu.., R/sub t//sup nu/, are, respectively, R/sub b//sup anti nu/ approximately equa… more

Date: January 1, 1979

Creator: Scott, D. M. & Tanaka, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Weak neutral currents and future Z mass measurements: Anticipating SLC

The goals of this work are: to test the standard SU(2)/sub L/ x U(1) model at the tree and quantum loop level, provide a precise determination of sin/sup 2/ theta/sub W/ which could, for example, be used to rule out or at least constrain various grand unified theories (GUTS), and look for hints of ''new physics.'' The topics this paper elaborates on are radiative corrections, top quark mass bounds, grand unified theories (GUTS), and extra Z' boson constraints. In addition, the implications of a… more

Date: September 1, 1987

Creator: Marciano, William J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Angular momentum and the collective modes excited in deep-inelastic processes and in fission. [288 MeV]

The angular momentum effects in deep inelastic processes and fission were studied in the limit of statistical equilibrium. The model consists of two touching liquid drop spheres. Angular momentum fractionation was found to occur along the mass asymmetry coordinate. Thermal excitation of fragment spin is predicted to occur in the degrees of freedom which can bear angular momentum, like wriggling, tilting, bending, and twisting. 17 references.

Date: May 1, 1979

Creator: Moretto, Luciano G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Muon scattering into 1 to 5 muon final states. [90 to 209 MeV]

Interactions of 209- and 90-GeV muons within a magnetized-steel calorimeter have produced final states containing one, two, three, four, and five muons. Redundant systems of proportional and drift chambers, fully sensitive in the forward direction, maintained 9% dimuon-mass resolution and high acceptance for multimuon final states. The first data are presented on F/sub 2/(x, Q/sup 2/) from charged lepton-nucleon scattering spanning a range in ln (ln, Q/sup 2/) comparable to that measured in hig… more

Date: September 1, 1979

Creator: Clark, A.R.; Johnson, K.J. & Kerth, L.T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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/bar p/p collider physics

This note encompasses a set of six lectures given at the summer school held at Campos Do Jordao in January of 1989 near Sao Paulo, Brazil. The intent of the lectures was to describe the physics of /bar p/p at CERN and Fermilab. Particular attention has been paid to making a self contained presentation to a prospective audience of graduate students. Since large Monte Carlo codes might not be available to all members of this audience, great reliance was placed on ''back of the envelope estimates.… more

Date: March 1, 1989

Creator: Green, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the nucleon structure function using high energy muons

We have measured the inclusive deep inelastic scattering of muons on nucleons in iron using beams of 93 and 215 GeV muons. To perform this measurement, we have built and operated the Multimuon Spectrometer (MMS) in the muon beam at Fermilab. The MMS is a magnetized iron target/spectrometer/calorimeter which provides 5.61 kg/cm/sup 2/ of target, 9% momentum resolution on scattered muons, and a direct measure of total hadronic energy with resolution sigma/sub nu/ = 1.4..sqrt..nu(GeV). In the dist… more

Date: December 1, 1983

Creator: Meyers, Peter Daniel

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Muon energy loss at high energy and implications for detector design

We study the effects of energy loss and associated electromagnetic showers on muon tracking and momentum measurement in muon detectors operating in the energy range 100 GeV-5 TeV. A detailed Monte Carlo simulation tracks muons and shower particles through a detector structure and evaluates the charged-particle environment in chambers. We find that catastrophic energy loss events accompanied by energetic showers can pose serious problems to designers of muon spectrometers. 14 refs., 6 figs.

Date: November 1, 1987

Creator: Eastman, J.J. & Loken, S.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Physics with polarized beams above GeV region

During the past several years many exciting and unexpected results have been observed in experiments with polarized beams. Those results are reviewed briefly. A new polarized beam line up to 600 GeV/c is also discussed. 4 figures.

Date: January 1, 1980

Creator: Yokosawa, A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

New flavor production in. gamma. ,. mu. ,. nu. , and hadron beams. [Review]

During the last few years the main emphasis in the study of heavy particle production (mainly charm) by means other than e/sup +/e/sup -/ annihilation has been on the production mechanisms. This review concentrates mainly on the production data in ..gamma.., ..mu.., ..nu.., and hadron beams. The heavy flavor searches divide themselves naturally into three categories, each one characterized by its own peculiar advantages and shortcomings; these are summarized briefly. Then the following topics a… more

Date: January 1, 1980

Creator: Wojcicki, S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Physics with the Axial Field Spectrometer

The Axial Field Spectrometer collaboration at the CERN Intersecting Storage Rings (ISR) is engaged in a programme investigating deep inelastic hadron collisions with a detector system consisting of a cylindrical drift chamber, uranium/scintillator hadron calorimeters, liquid-argon calorimeters, and Cherenkov counters. The latter three devices are used for triggering on high-p/sub T/ hadron jets, direct ..gamma.. and ..pi../sup 0/, and identified charged hadrons, respectively. The spectrometer i… more

Date: January 1, 1982

Creator: Collaboration, Athens-Brookhaven-CERN-Copenhagen (NBI)-Lund-Pennsylvania-Rutherford Appleton Lab.-Tel Aviv

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental summary of the XIII Rencontre de Moriond

This is the written version of a summary talk on some of the experimental results presented at the XIII Rencontre de Moriond. Results are reviewed in the following areas: studies of the quark-parton model, Bjorken scaling, and quark fragmentation using virtual photons, neutrinos, and e/sup +/e/sup -/ annihilation; properties of the tau lepton, D charmed meson, and F charmed meson as measured in e/sup +/e/sup -/ annihilation; production of charmed particles by photons, neutrinos, and hadrons, in… more

Date: June 1, 1978

Creator: Perl, Martin L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Experimental search for W/Z pairs and Higgs bosons at very high energy hadron-hadron colliders

We study, from an experimental point of view, the main ways to detect standard high mass Higgs bosons (from 300 GeV up to about 1 TeV) when they decay into W- and Z-pairs at the SSC. We also consider the corresponding W- and Z/sup 0/-pair continuum which may itself provide interesting physics, and we pay some attention to the case of an intermediate mass charged Higgs decaying into tau..nu../sub tau/ (m/sub H+-/ = 300 GeV). We first explain why and how high energy pp colliders may search for Hi… more

Date: March 1, 1987

Creator: Alverson, G.; Bengtsson, H.U.; Hauptman, J.; Hedin, D.; Herrero, M.J.; Wang, E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutral-Current X-Distributions

The role of the semi-leptonic neutral current interaction as a probe of nucleon structure is examined. Previous measurements of neutral current x-distributions are reviewed, and new results from the Fermilab - MIT - MSU collaboration are presented. 4 references.

Date: June 1984

Creator: Bogert, D.; Burnstein, R.; Fisk, R.; Fuess, S.; Bofill, J.; Busza, W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Experimental Medium Energy Physics

This report discusses the following topics: Search for the H Dibaryon at the AGS; hypernuclear weak decay studies at the LAGS; search for strangelets using the 2 GeV/c beam line; experiment to detect double lambda hypernuclei; hyperon photoproduction at CEBAF; the region 1 drift chambers for the CLAS spectrometer; parity violating electron scattering from the proton: the G{sup 0}experiment at CEBAF; and relativistic heavy ion - nucleus collisions at the SPS.

Date: January 1, 1992

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Experimental studies of quasi-fission reactions

A large number of recent experimental studies have shown that a substantial fraction of the total reaction cross section in heavy-ion reactions is found in fission-like processes, which do not result from the fission decay of a completely fused system. Following the suggestion of Swiatecki such processes, which represents a complete relaxation of the relative kinetic energy and a substantial amount of net mass transfer between the two fragments, are denoted quasi-fission reactions. They are dis… more

Date: January 1, 1988

Creator: Back, B.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Lepton-pair production in hadron-nucleus collisions

The general features of lepton pair production are reviewed. Physics motivations for precision measurements of lepton pair production in nuclei are discussed. Preliminary results from Fermilab experiment E772 are presented. The relevance of these results to the EMC effects and to J//psi/ suppression in heavy ion collisions is also discussed. 73 refs., 26 figs., 2 tabs.

Date: January 1, 1988

Creator: Peng, J. C.; Alde, D. M.; Baer, H. W.; Carey, T. A.; Garvey, G. T.; Klein, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Generalized Vector Dominance and the Low q/sup 2/. mu. p and. mu. d Inelastic Scattering at 150 GeV. [Cross Sections, Structure Functions]

The generalized vector dominance model of Greco is used to relate recent electron and muon deep inelastic scattering measurements with the photoproduction cross section. An accurate fit of the SLAC 4/sup 0/ ep and ed scattering data for ..omega.. > 9 is obtained giving photoproduction cross sections in good accord with the directly measured values. The same fit applied to our recent ..mu..p and ..mu..d inelastic scattering measurements for q/sup 2/ < 1, gives estimates of sigma/sub ..gamma..d/ … more

Date: January 1, 1976

Creator: Anderson, H. L.; Bharadwaj, V. K. & Booth, N. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent results from BNL neutrino experiments and plans for the future

Recent results on neutrino scattering from experiments in the wide band neutrino beam at Brookhaven are discussed. There are recent 7' BC measurements on quasi-elastic scattering and charged current total cross sections (..nu..-D/sub 2/) and charged current neutron to proton cross section ratios (..nu..-D/sub 2/, ..nu..-N/sub e//H/sub 2/). Final results from two counter experiment measurements of anti ..nu..p elastic scattering are presented. Present and future activity at Brookhaven is outline… more

Date: January 1, 1981

Creator: Murtagh, M. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department