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in subjects: "Lepton-Hadron Interactions"

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Structure functions: Their status and implications

I discuss the current status of structure functions. Attention is given to the uncertainties in them and the implications of these uncertainties for experimental predictions. I indicate which experiments are capable of removing these uncertainties. 17 refs., 17 figs., 1 tab.

Date: September 29, 1988

Creator: Hinchliffe, I.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Transverse spin observables in chromodynamics

Quantum Chromodynamics confronts a harsh series of tests in the attempt to formulate a comprehensive approach to the calculation of transverse spin observables. The basic obstacles to understanding transverse spin can be illustrated by considering the transverse structure function g{sub T}(x, Q{sup 2}) = g{sub 1}(x, Q{sup 2}) + g{sub 2}(x, Q{sup 2}), extracted from deep-inelastic scattering using a polarized lepton and a polarized proton. The inadequacy of the transverse-spin basis for quarks a… more

Date: December 1, 1989

Creator: Sivers, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Jet rates from deep inelastic muon scattering in the W range of 15 to 35 GeV

Production rates of forward jets in deep inelastic muon scattering are studied using the JADE jet finding algorithm. The evolution of di-jet rates with W is compared to QCD first order predictions in the W range of 15 to 25 GeV. 7 refs., 3 figs.

Date: August 1, 1991

Creator: Salgado, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Quarks and gluons in hadrons and nuclei

These lectures discuss the particle-nuclear interface -- a general introduction to the ideas and application of colored quarks in nuclear physics, color, the Pauli principle, and spin flavor correlations -- this lecture shows how the magnetic moments of hadrons relate to the underlying color degree of freedom, and the proton's spin -- a quark model perspective. This lecture reviews recent excitement which has led some to claim that in deep inelastic polarized lepton scattering very little of th… more

Date: December 1, 1989

Creator: Close, F. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent experimental studies on Hadron showers produced in high energy muon-nucleus interactions

The Fermilab Tevatron Muon Experiment has analyzed the hadron showers of events resulting from the scattering of a muon beam (< E{sub {mu}} > = 490 GeV) off H{sub 2}, D{sub 2} and Xenon targets. The topics which will be discussed are: (1) space-time evolution of the hadronization process; (2) leading hadron distributions in the shadowing region; (3) rates and characteristics of 3-jet events. 23 refs.

Date: May 1, 1992

Creator: Morfin, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Measurement of sin/sup 2/theta/sub w/ in Semileptonic nu Fe and anti nu Fe Interactions

We report results from neutral current scattering of muon neutrinos and antineutrinos on iron nuclei by the CCFRR experiment at Fermilab. Our objective is the measurement of sin/sup 2/theta/sub w/ from inclusive semileptonic neutrino-nucleon interactions. Such a measurement, even though it is subject to more corrections than the analogous measurement in neutrino-electron scattering (e.g. due to the presence of a strange quark sea in the nucleon), has a high degree of statistical accuracy and ma… more

Date: October 1983

Creator: Blair, R. E.; MacFarlane, D. B.; Messner, R. L.; Novikoff, D. B.; Purohit, M. V.; Merritt, F. S. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Recent experimental measurements of the neutrino charged current cross sections

Recent experimental measurements of the neutrino charged current total cross sections are reviewed. (GHT)

Date: January 1, 1979

Creator: Theriot, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A proposal for a precision test of the standard model by neutrino-electron scattering (Large /hacek C/erenkov Detector Project)

A precision measurement of neutrino-electron elastic scattering from a beam stop neutrino source at LAMPF is proposed. The total error in sin/sup 2/theta/sub W/ is estimated to be +-0.89/percent/. The experiment also will be sensitive to neutrino oscillations and supernova-neutrino bursts, and should set improved limits on the neutrino-charge radius and magnetic-dipole moment. The detector consists of a 2.5-million-gallon tank of water with approximately 14,000 photomultiplier tubes lining the … more

Date: April 1, 1988

Creator: Allen, R. C.; Lu, X.-Q.; Gollwitzer, K.; Igo, G. J.; Gulmez, E.; Whitten, C. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Open and hidden charm muoproduction. [209 GeV]

New results are presented on open and hidden charm and bottom production by 209-GeV muons interacting in a magnetized steel calorimeter. The upper limit on the production of T states by muons is sigma(..mu..N ..-->.. ..mu..UPSILONX)B(UPSILON ..-->.. ..mu mu..) < 22 x 10/sup -39/ cm/sup 2/ (90% confidence level). The distributions of elastically produced psi's are consistent with s-channel helicity conservation (SCHC) and disagree with psi dominance. From analysis of dimuon final states the cros… more

Date: September 1, 1980

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

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Strange-Particle Production in High-Energy Anti. Nu. And. Nu. Charged-Current Interactions on Protons

We have studied the semi-inclusive reactions anti ..nu..p ..-->.. ..mu../sup +/V/sup 0/X and ..nu..p ..-->.. ..mu../sup -/V/sup 0/X, and measured the fractional rate for producing one or more neutral strange particles in these reactions to be 0.16 +- 0.03 and 0.15 +- 0.04, respectively. We have observed K/sup -/(892) and ..sigma../sup -/(1385) production in anti ..nu..p scattering at a few percent of the inclusive rate. No evidence for D/sup 0/ production was seen in the K/sub s//sup 0/..pi../s… more

Date: January 1, 1980

Creator: Brock, R.; Barish, S. J. & Engler, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Normalizing the renormalization group in deep inelastic leptoproduction. CTP No. 878

The quark-bag model is used to calculate the nucleon matrix elements of local twist-two operators. Bag matrix elements applicable to low Q/sup 2/ are evolved by use of QCD perturbation theory to a value of Q/sup 2/ large enough that the data can be expected to be dominated by twist-two. Nonsinglet moments of F/sub 3/ are plotted. Although only twist-two was studied, the work has implications for higher twist. It is concluded that either the twist-two operator matrix element is Q/sup 2/ dependen… more

Date: September 1, 1980

Creator: Jaffe, R.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Quarks and gluons in hadrons and nuclei

Date: January 1, 1989

Creator: Close, F. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

nu. N,. mu. N interactions: structure functions, higher twist

Data on deep inelastic scattering of leptons by nucleons and nuclei have been accumulated for several years. Results exist from several experiments with electron, muon, neutrino beams. In this talk I shall review the most recent experiments which measured nucleon structure functions with ..nu.. and ..mu.. beams. In particular, I will summarize the results on R = sigma/sub L//sigma/sub T/ measurement, on F/sub 2/(x,Q/sup 2/), and xF/sub 3/(x,Q/sup 2/), and their interpretation in terms of QCD, i… more

Date: October 1, 1981

Creator: Matteuzzi, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Theoretical aspects of lepton-hadron scattering

In this paper, I will emphasize two points on Theoretical Aspects of Lepton-Hadron Scattering: (1) The crucial importance of testing the exact'' sum rules as tests of the local current algebra. Discrepancies, if found, between experiment and theory cannot be interpreted away'' in terms of more complex parton wave functions for the hadronic ground state. The three sum rules of interest are those of Adler, Bjorken, and Gross and Llewellyn-Smith. (2) An understanding of the corrections to scaling … more

Date: January 1, 1992

Creator: Drell, S.D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Results from FNAL E745 on neutrino-nucleus interactions (EMC effect and hadron formation)

The dark tracks (stubs) in high energy neutrino-nucleus interactions in the Tohoku High Resolution Freon Bubble Chamber are investigated. Classifying events into groups by using the dark tracks, correlations between the dark track production and neutrino interactions are studied. Events without dark tracks comprise a reasonable sample of events which occurred on quasi-free nucleons inside nucleus. By comparing the groups using the no dark track group as a comparison sample instead of neutrino-d… more

Date: January 1, 1989

Creator: Kitagaki, T. (Tohoku Univ., Sendai (Japan). Bubble Chamber Physics Lab.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Inclusive quasielastic and deep inelastic electron scattering at high energies

With high electron energies a kinematic regime can be reached where it will be possible to separate quasielastic and deep inelastic scattering. We present a short description of these processes which dominate the inclusive spectrum. Using the highest momentum transfer data available to guide our estimates, we give the kinematic requirements and the cross sections expected. These results indicate that inclusive scattering at high q has a yet unfilled potential. 18 refs., 13 figs.

Date: January 1, 1990

Creator: Day, D.B.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Progress report of a research program in experimental and theoretical high energy physics, 1 January 1992--31 May 1992

This report discusses research at Brown University in experimental and theoretical high energy physics. Some of the research programs conducted are: interactions of leptons and hadrons form accelerator and astrophysical sources; hadron interactions with hydrogen and heavier nuclei; large volume detector at the Gran Sasso Laboratory; GEM collaboration at SSC; and hadron colliders and neutrino physics. (LSP)

Date: June 1, 1992

Creator: Brandenberger, R.; Cutts, D.; Fried, H. M.; Guralnik, G.; Jevicki, A.; King, K. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Photon-gluon fusion: a review

A brief review of the photon-gluon fusion model for heavy quark (virtual) photoproduction is presented. It is compared with existing data, and some difficulties and speculations are discussed. 12 figures.

Date: November 1, 1979

Creator: Leveille, J.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Hadronic structure of the weak neutral current. [Cross sections]

A comparison of neutral and charged current deep inelastic neutrino interactions is made in an experiment utilizing the Fermilab 15 ft bubble chamber. The ratio of neutral current events (NC) to charged current events (CC) is 0.35 +- .06 when the visible hadronic energy is greater than 10 GeV. The distributions of NC and CC in a new variable called u/sub vis/, which depends only on the observed hadrons, are given. From these distributions and the assumption that the x distribution is the same f… more

Date: September 1, 1977

Creator: Marriner, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Determination of sin/sup 2/THETA/sub w/ and rho in deep inelastic neutrino-nucleon scattering

We have determined the electroweak parameters sin/sup 2/THETA/sub w/ and rho by a measurement of deep inelastic neutrino-nucleon scattering using a fine grained neutrino detector exposed to a narrow band neutrino beam at Fermilab. The unique sampling properties of our detector have permitted neutral current and charged current events to be unambiguously identified over a wide kinematic range, thereby allowing a determination of sin/sup 2/THETA/sub w/ and rho to be made with good statistics and … more

Date: June 1, 1985

Creator: Bogert, D.; Burnstein, R.; Fisk, R.; Fuess, S.; Morfin, J.; Ohska, T. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Neutrino production of ''new'' particles in bubble chambers

Some results from the study of neutrino interactions above 1 GeV are summarized which are relevant to the utility of such investigations for unearthing new phenomena. The variety of experimental searches and their relevance, bubble chamber techniques, review of the Glashow--Iliopoulos--Maiani model predictions for leptonic decay, and some experimental results for charmed and strange particle phenomena, di-lepton results, nonleptonic decay of charm, evidence for D/sup 0/ production, and heavy le… more

Date: January 1, 1977

Creator: Samios, N. P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Elastic scattering of neutrinos by electrons and protons

Measurements of the cross sections for neutrino and antineutrino elastic scattering by both electrons and protons are presented. These measurements were done at the Brookhaven AGS by the E734 Collaboration (Brookhaven/Brown/KEK/Osaka/Pennsylvania/Stony Brook). These results are then used to determine the weak mixing angle sin/sup 2/theta/sub w/. 6 refs., 3 figs.

Date: January 1, 1985

Creator: Hedin, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Diffusion model predictions for kinetic energy, mass, angular distributions, and. gamma. -ray multiplicities in heavy ion induced reactions

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

What we can learn from lepton-quark interactions

A review is presented of what has been learned from lepton-quark interactions. Next, the context in which to ask future questions, the paradigm, it constitutes the set of assumptions that we believe on the basis of present experiments and which - subject always to refinement, extension, and revision - defines the way we talk about experiments done now and in the future. Two fothcoming neutrino experiments are discussed which seem to be of specific interest. Finally, some of the possibilities fo… more

Date: July 1, 1981

Creator: Quigg, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department